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CO_2 methanation over TiO_2–Al_2O_3 binary oxides supported Ru catalysts 认领 引用 被引量：3
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作者 Jinghua Xu Qingquan Lin +3 位作者 Xiong Su Hongmin Duan Haoran Geng Yanqiang Huang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第1期140-145,共6页
TiO_2 modified Al_2O_3 binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru/TiO_2–Al_2O_3catalyst in CO_2 methanation reaction was inv... TiO_2 modified Al_2O_3 binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru/TiO_2–Al_2O_3catalyst in CO_2 methanation reaction was investigated. Compared with Ru/Al_2O_3 catalyst, the Ru/TiO_2–Al_2O_3catalytic system exhibited a much higher activity in CO_2 methanation reaction. The reaction rate over Ru/TiO_2–Al_2O_3 was 0.59 mol CO_2·(g Ru)1·h-1, 3.1 times higher than that on Ru/Al_2O_3[0.19 mol CO_2·(gRu)-1·h-1]. The effect of TiO_2 content and TiO_2–Al_2O_3calcination temperature on catalytic performance was addressed. The corresponding structures of each catalyst were characterized by means of H_2-TPR, XRD, and TEM. Results indicated that the averaged particle size of the Ru on TiO_2–Al_2O_3support is 2.8 nm, smaller than that on Al_2O_3 support of 4.3 nm. Therefore, we conclude that the improved activity over Ru/TiO_2–Al_2O_3catalyst is originated from the smaller particle size of ruthenium resulting from a strong interaction between Ru and the rutile-TiO_2 support, which hindered the aggregation of Ru nanoparticles. 展开更多
关键词 CO2 methanation Supported Ru catalyst TiO2–Al2O3 binary oxide
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Preparation and Characterization of ZrO_2 Nanoparticles Capped by Trioctylphosphine Oxide (TOPO) 认领 引用 被引量：1
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作者 马剑琪 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第4期611-614,共4页
Monodisperse ZrO2 nanoparticles capped by trioctylphosphine oxide （TOPO） were prepared in non-aqueous solvent using in-situ synthesis method. Transmission electron microscopy（TEM）, X-ray diffraction（XRD）, X-ray ... Monodisperse ZrO2 nanoparticles capped by trioctylphosphine oxide （TOPO） were prepared in non-aqueous solvent using in-situ synthesis method. Transmission electron microscopy（TEM）, X-ray diffraction（XRD）, X-ray photoelectron spectrometer（XPS）, Fourier transformation infrared spectroscopy （FTIR）, and thermogravimetric analysis（TGA） were adopted to characterize and investigate the size, structure, composition, and the binding manners between organic capping agent TOPO and inorganic ZrO2 nanocores of the as-prepared nanoparticles. In addition, the nanoparticles were also studied to determine their solubility and relative stability. The experimental results show that the prepared nanoparticles contain about 25% organic capping shell TOPO, 75% inorganic ZrO2 nanocores, and can be easily dissolved and be stably disersed in non-polar organic solvents. 展开更多
关键词 ZrO2 nanoparticles trioctylphosphine oxide （TOPO） monodisperse solubility
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SiC-MoSi_2/ZrO_2-MoSi_2 coating to protect C/C composites against oxidation 认领 引用 被引量：8
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作者 付前刚 张佳平 +2 位作者 张正中 李贺军 孙粲 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2113-2117,共5页
To improve the oxidation resistance of carbon/carbon （C/C） composites in air at high temperatures, a SiC- MoSi2/ZrO2-MoSi2 coating was prepared on the surface of C/C composites by pack cementation and slurry method.... To improve the oxidation resistance of carbon/carbon （C/C） composites in air at high temperatures, a SiC- MoSi2/ZrO2-MoSi2 coating was prepared on the surface of C/C composites by pack cementation and slurry method. The microstructures and phase compositions of the coated C/C composites were analyzed by scanning electron microscopy and X-ray diffraction, respectively. The result shows that the SiC-MoSi2/ZrO2-MoSi2 coating is dense and crack-free with a thickness of 250-300 μm. The preparation and the high temperature oxidation property of the coated composites were investigated. The as-received coating has excellent oxidation protection ability and can protect C/C composites from oxidation for 260 h at 1773 K in air. The excellent anti-oxidation performance of the coating is considered to come from the formation of ZrSiO4, which improves the stability of the coating at high temperatures. 展开更多
关键词 carbon/carbon composites SiC-MoSi2/ZrO2-MoSi2 coating oxidation resistance
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Preparation and characterization of ZrO_2/TiO_2 composite photocatalytic film by micro-arc oxidation 认领 引用 被引量：9
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作者 罗强 蔡启舟 +4 位作者 李欣蔚 潘振华 李玉洁 陈喜娣 严青松 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第10期2945-2950,共6页
ZrO2/TiO2 composite photocatalytic film was produced on the pure titanium substrate using in-situ Zr（OH）4 colloidal particle by the micro-arc oxidation technique and characterized by scanning electron microscope （... ZrO2/TiO2 composite photocatalytic film was produced on the pure titanium substrate using in-situ Zr（OH）4 colloidal particle by the micro-arc oxidation technique and characterized by scanning electron microscope （SEM）, energy dispersive X-ray （EDX）, X-ray diffraction （XRD） and ultraviolet-visible （UV-Vis） spectrophotometer. The composite film shows a lamellar and porous structure which consists of anatase, futile and ZrO2 phases. The optical absorption edge of film is shifted to longer wavelength when ZrO2 is introduced to TiO2. Furthermore, the photocatalytic reaction rate constants of degradation of rhodamine B solution with ZrO2/TiO2 composite film and pure TiO2 film under ultraviolet irradiation are measured as 0.0442 and 0.0186 h 1, respectively. 展开更多
关键词 pure titanium micro-arc oxidation Zr（OH）4 colloidal particle ZrO2/TiO2 composite photocatalytic film
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Effects of Yttrium Ion on Formation Mechanism of ZrO_2-Y_2O_3 Ceramic Coatings Formed by Plasma Electrolytic Oxidation on Al-12Si Alloy 认领 引用 被引量：4
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作者 王萍 LI Jianping +2 位作者 GUO Yongchun YANG Zhong WANG Jianli 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第5期1044-1048,共5页
ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation （PEO） on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.： The results show that... ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation （PEO） on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.： The results show that adding an appropriate amount of yttrium ion can improve the growing rate of ceramic coating at different oxidation stages and decrease arc voltage. The thickness of ZrO2-Y2O3 coating is 16 μn thicker than that of ZrO2 coating and the maximum oxidation rate improves by 0.6 μm/min. In addition, the arc voltage decreases from 227 to 172 V. It can be seen that the rate of oxidation firstly increases to some extent and then decreases with the content of yttrium ion increasing. The growth rate reaches the maximum while the content of yttrium ion is 0.05 g-L-1The maximum thickness is 90 μm.Compared to ZrO2 coating, the micropores of ZrO2-Y2O3 coating are less and the ceramic layer is repeatedly deposited by ZrO2 and Y2O3 ceramic particles. Meanwhile, the binding force between coating and substrate is better and the coating is uniform and compact. The ceramic layer is mainly composed of c-Y0.15Zr0.85O1.93□0.07, m-ZrO2, α-Al2O3, ,γ-Al2O3 and Y2O3. It is indicated that ZrO2 has beert fully stabilized by yttrium ion through the formation of solid solution. 展开更多
关键词 Al-12Si alloys yttrium ion plasma electrolytic oxidation ZrO2-Y2O3 ceramic coating
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Screening of MgO- and CeO_2-Based Catalysts for Carbon Dioxide Oxidative Coupling of Methane to C2+ Hydrocarbons 认领 引用 被引量：5
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作者 Istadi Nor Aishah Saidina Amin 《Journal of Natural Gas Chemistry》 2004年第1期23-35,共13页
The catalyst screening tests for carbon dioxide oxidative coupling of methane (CO2-OCM) have been investigated over ternary and binary metal oxide catalysts. The catalysts are prepared by doping MgO- and CeO2-based so... The catalyst screening tests for carbon dioxide oxidative coupling of methane (CO2-OCM) have been investigated over ternary and binary metal oxide catalysts. The catalysts are prepared by doping MgO- and CeO2-based solids with oxides from alkali (Li2O), alkaline earth (CaO), and transition metal groups (WO3 or MnO). The presence of the peroxide (O2-2) active sites on the Li2O2, revealed by Raman spectroscopy, may be the key factor in the enhanced performance of some of the Li2O/MgO catalysts. The high reducibility of the CeO2 catalyst, an important factor in the CO2-OCM catalyst activity, may be enhanced by the presence of manganese oxide species. The manganese oxide species increases oxygen mobility and oxygen vacancies in the CeO2 catalyst. Raman and Fourier Transform Infra Red (FT-IR) spectroscopies revealed the presence of lattice vibrations of metal-oxygen bondings and active sites in which the peaks corresponding to the bulk crystalline structures of Li2O, CaO, WO3 and MnO are detected. The performance of 5%MnO/15%CaO/CeO2 catalyst is the most potential among the CeO2-based catalysts, although lower than the 2%Li2O/MgO catalyst. The 2%Li2O/MgO catalyst showed the most promising C2+ hydrocarbons selectivity and yield at 98.0% and 5.7%, respectively. 展开更多
关键词 catalyst screening carbon dioxide oxidative coupling methane ternary metal oxide binary metal oxide MgO CeO2 C2+ hydrocarbons
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Oxidation of O'-SiAlON-ZrO_2 Composite Ceramics 认领 引用 被引量：2
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作者 Xidong Wang , Hong Bao, Wenchao Li Metallurgy School, University of Science and Technology Beijing, Beijing 100083, China Department of Metallurgy, East China University of Metallurgy Maan Shan 243002, China 《Journal of University of Science and Technology Beijing》 2001年第1期43-47,共5页
The oxidation kinetics of O'-SiAlON-ZrO2 composite ceramics in the temperature range of 1373-1773K has been studied. The oxidation experiments with powder and plates of O'-SiAlON-ZrO2 composite ceramics in air... The oxidation kinetics of O'-SiAlON-ZrO2 composite ceramics in the temperature range of 1373-1773K has been studied. The oxidation experiments with powder and plates of O'-SiAlON-ZrO2 composite ceramics in air have been carried out. The overall activation energy of oxidation reaction is 263.69 kJ/mol. The products and structures of O'-SiAlON-ZrO2 oxidation layer have been analysed by XRD (X-ray diffraction), SEM (scanning electron microscope) and AFM (atomic force microscope). 展开更多
关键词 O '-SiAlON ZrO2 ceramics oxidation
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退火温度对IrO_2+ZrO_2涂层结构和电容性能的影响 认领 引用
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作者 马晓磊 邵艳群 +4 位作者 朱君秋 娄长影 何建福 林星星 唐电 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2015年第12期3192-3196,共5页
采用热分解法在Ti基上被覆了IrO_2+ZrO_2氧化物涂层。通过XRD、SEM、EDX、XPS和循环伏安法等分析了退火温度对IrO_2-ZrO_2二元氧化物涂层的物相、表面形貌和电容性能的影响,引用非线性方程q~*(v)=A_1exp-v_1+A_2exp-v_2+y_0计算... 采用热分解法在Ti基上被覆了IrO_2+ZrO_2氧化物涂层。通过XRD、SEM、EDX、XPS和循环伏安法等分析了退火温度对IrO_2-ZrO_2二元氧化物涂层的物相、表面形貌和电容性能的影响,引用非线性方程q~*(v)=A_1exp-v_1+A_2exp-v_2+y_0计算了涂层的内外活性点。结果表明:IrO_2-ZrO_2涂层的临界晶化温度为340~360℃,340℃退火的涂层物相为非晶结构,360℃退火,含有晶态和非晶态2种结构组织,其离子价态为Ir3+、Ir4+以及过饱和IrO2+x(x>0)。电容性能随着温度的升高呈先增大后减小变化,360℃退火的电极有最大的电容值,与其"非晶态/晶态"两相共存组织结构有关。涂层中质子迁移能力比电子导电能力对电容的影响要大,扫描速度对质子迁移的影响大于对电子导电的影响。 展开更多
关键词 组织结构 电容性能 IrO2+ZrO2二元氧化物 热分解
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High temperature cyclic oxidation behavior of Y_2O_3-ZrO_2 thermal barrier coatings irradiated by high-intensity pulsed ion beam 认领 引用
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作者 王一奇 雷明凯 +1 位作者 AFSAR A M SONG J I 《Journal of Central South University》 SCIE EI CAS 2009年第1期13-17,共5页
The high-temperature oxidation resistance behavior of 7% （mass fraction） Y203-ZrO2 thermal barrier coatings （TBCs） irradiated by high-intensity pulsed ion beam （HIPIB） was investigated under the cyclic oxidation... The high-temperature oxidation resistance behavior of 7% （mass fraction） Y203-ZrO2 thermal barrier coatings （TBCs） irradiated by high-intensity pulsed ion beam （HIPIB） was investigated under the cyclic oxidation condition of 1 050 ℃ and 1 h. The columnar grains in the TBCs disappear after the HIPIB irradiation at ion current densities of 100-200 A/cm^2 and the irradiated surface becomes smooth and densified after remelting and ablation due to the HIPIB irradiation. The thermally grown oxide （TGO） layer thickness of the irradiated TBCs is smaller than that of the original TBCs. After 15 cycles, the mass gains of the original TBCs and those irradiated by ion current densities of 100 and 200 A/cm^2 due to the oxidation are found to be 0.8-0.9, 0.6-0.7, and 0.3-0.4 mg/cm^2, respectively. The inward diffusion of oxygen through the irradiated TBCs is significantly impeded by the densified top layer formed due to irradiation, which is the main reason for the improved overall oxidation resistance of the irradiated TBCs. 展开更多
关键词 Y2O3 ZrO2 thermal barrier coating high-intensity pulsed ion beam electron beam physical vapor deposition oxidation resistance cyclic oxidation
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Influence of Binary Oxidant (FeCl3:APS) Ratio on the Spectroscopic and Microscopic Properties of Poly(2,5-Dimethoxyaniline) 认领 引用 被引量：1
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作者 Rajiv K. Singh Amit Kumar +3 位作者 Khushboo Agarwal Deepshikha Dwivedi Keadar N. Sood Ramadhar Singh 《Open Journal of Polymer Chemistry》 2012年第3期105-112,共8页
Poly(2,5-dimethoxyaniline) (PDMA) has been synthesized by chemical oxidative polymerization technique using varying ratio (wt/wt) of binary oxidants;ferric chloride (FeCl3) and ammonium persulfate (APS). Fourier trans... Poly(2,5-dimethoxyaniline) (PDMA) has been synthesized by chemical oxidative polymerization technique using varying ratio (wt/wt) of binary oxidants;ferric chloride (FeCl3) and ammonium persulfate (APS). Fourier transform infrared (FT-IR) and ultraviolet-visible (Uv-vis) spectroscopic investigations provide the evidence of the presence of both benzenoid and quinoid ring units. The thermal analysis and structural characterization data suggests that the oxidant ratio greatly controls the molecular ordering in PDMA. Surface morphology shows the existence of both amorphous and crystalline domains wherein the crystalline domain size depends on the oxidant ratio. The dc conductivity (σdc) of PDMA is also a function of binary oxidant ratio and at FeCl3:APS (50:50), it increases by two orders of magnitude. Films of PDMA synthesized using FeCl3:APS (50:50) binary oxidant exhibits a decrease in the surface current on exposure to ammonia gas. 展开更多
关键词 Poly(2 5-Dimethoxyaniline) Binary Oxidant Structured Polymer DC Conductivity
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Promotional effects of Er incorporation in CeO_2(ZrO_2)/TiO_2 for selective catalytic reduction of NO by NH_3 认领 引用 被引量：11
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作者 Qijie Jin Yuesong Shen +2 位作者 Shemin Zhu Xihong Li Min Hu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第9期1521-1529,共9页
A series CeO2（ZrO2）/TiO2 catalysts were modified with Er using a sol-gel method.The catalytic activity of the obtained catalysts in the selective catalytic reduction（SCR） of NO with NH3 was investigated to determi... A series CeO2（ZrO2）/TiO2 catalysts were modified with Er using a sol-gel method.The catalytic activity of the obtained catalysts in the selective catalytic reduction（SCR） of NO with NH3 was investigated to determine the appropriate Er dosage.The catalysts were characterized using X-ray diffraction,N2 adsorption,NH3 temperature-programmed desorption,H2 temperature-programmed reduction,photoluminescence spectroscopy,electron paramagnetic resonance spectroscopy,and X-ray photoelectron spectroscopy.The results showed that the optimum Er/Ce molar ratio was 0.10;this catalyst had excellent resistance to catalyst poisoning caused by vapor and sulfur and gave more than 90% NO conversion at 220–395 ℃ and a gas hourly space velocity of 71 400 h^-1.Er incorporation increased the Ti^3＋ concentrations,oxygen storage capacities,and oxygen vacancy concentrations of the catalysts,resulting in excellent catalytic performance.Er incorporation also decreased the acid strength and inhibited growth of TiO2 and CeO2 crystal particles,which increased the catalytic activity.The results show that high oxygen vacancy concentrations and oxygen storage capacities,large amounts of Ti^3＋,and low acid strengths give excellent SCR activity. 展开更多
关键词 CeO2（ZrO2）/TiO2 Erbium incorporation Selective catalytic reduction Nitrogen oxide Catalytic performance
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Effects of ZrO_2 Nanoparticles on the Microstructure and Thermal-protective Properties of PEO Coating on Al-12.5%Si Alloy 认领 引用 被引量：3
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作者 WANG Ping HAN Jing +1 位作者 YAN Junheng WANG Jiandong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2019年第1期156-164,共9页
PEO ceramic coatings including ZrO_2-Al_2O_3-SiO_2 in three phases were prepared on an Al-12.5%Si alloy in electrolyte solutions containing ZrO_2 nanoparticles. The microstructures and phases of the coatings were anal... PEO ceramic coatings including ZrO_2-Al_2O_3-SiO_2 in three phases were prepared on an Al-12.5%Si alloy in electrolyte solutions containing ZrO_2 nanoparticles. The microstructures and phases of the coatings were analyzed by SEM and XRD, and the heat insulation performance and the thermal shock resistance of the coatings were investigated. The compactness of the coating increased significantly and the hindrance of the Si element on plasma electrolytic oxidation process was effectively weakened. The growth rate of the coating was improved substantially with the addition of ZrO_2 nanoparticles. The PEO ceramic coatings are primarily composed of SiO_2 and high temperature steady phases such as a-Al_2O_3 and c-ZrO_2. Both the content of c-ZrO_2 and the heat-insulating property of the coating increased significantly. The ceramic coatings with special microstructure and composition formed in the solutions containing ZrO_2 nanoparticles possess excellent heat insulation performance and thermal shock resistance. 展开更多
关键词 Al-12.5%Si alloy modified plasma electrolytic oxidation ZrO2 nanoparticles heat-insulating properties thermal shock resistance
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(Y1‒xGdx)2O3对WC增强Ni基复合涂层组织结构及性能的影响 认领 引用
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作者 尹自豪 马兴华 +3 位作者 尹宇 马名浩 张树玲 郭峰 《表面技术》 EI CAS CSCD 北大核心 2025年第19期153-162,共10页
目的为了优化WC增强Ni基复合涂层的成型品质及其耐磨耐蚀性能,研究采用激光熔覆技术制备(Y1‒xGdx)2O3/WC/Ni60A复合涂层。方法首先,在25%WC/Ni60A的基础涂层中,添加2%的(Y1‒xGdx)2O3(0.0≤x≤1.0)双元稀土氧化... 目的为了优化WC增强Ni基复合涂层的成型品质及其耐磨耐蚀性能,研究采用激光熔覆技术制备(Y1‒xGdx)2O3/WC/Ni60A复合涂层。方法首先,在25%WC/Ni60A的基础涂层中,添加2%的(Y1‒xGdx)2O3(0.0≤x≤1.0)双元稀土氧化物,利用X射线衍射分析仪(XRD)、扫描电子显微镜(SEM)结合能谱仪(EDS)等表征工具,对涂层的物相组成、微观结构及元素分布进行分析。运用显微维氏硬度计(HV-1000)、摩擦磨损试验机(UMT-3)以及电化学工作站(CHI-760)等,对涂层的耐磨耐蚀性进行测试。结果通过激光熔覆制备的涂层组织致密,且与基体形成了牢固的冶金结合。XRD分析揭示,该复合涂层主要由γ-Ni枝晶和γ相结构的(Fe,Ni)固溶体构成,而在添加(Y1‒xGdx)2O3后,还检测到了Ni2Y、Gd2Fe17Si等化合物的析出。由SEM和EDS的观察分析结果可知,涂层厚度约为1.5 mm,熔覆层无孔洞和裂纹等缺陷,组织分布均匀,未出现元素偏析现象。硬度测试数据表明,随着x值的增大,复合涂层的平均显微硬度呈上升趋势,在x=0.8时达到峰值465.61HV,约为基体硬度的2.3倍。在摩擦磨损测试中,当x=0.8时,复合涂层展现出最低的摩擦系数(约0.45)和最小的磨损率(约2.09×10‒3 mm3/(N·m)),较未添加(Y1‒xGdx)2O3的涂层,耐磨损性能提升了58.78%。电化学测试结果则显示,当x=0.2时,复合涂层的耐蚀性能最为优异,此时的自腐蚀电位和自腐蚀电流密度分别为‒0.3872 V和2.192×10‒6 A/cm2,但随着x值的继续增大,耐蚀性能逐渐减弱。结论双元稀土氧化物的掺入能够显著提升WC/Ni60A涂层的耐磨耐蚀性能,预示着该材料在极端海洋环境下的表面防护领域具有广阔的应用前景。 展开更多
关键词 激光熔覆 WC/Ni60A涂层 (Y1‒xGdx)2O3双元稀土氧化物 组织结构 耐磨耐腐蚀性能
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负载铁锰氧化物的玉米芯炭对Pb2+的吸附作用 认领 引用 被引量：15
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作者 赵天赐 周世真 +1 位作者 马小龙 马子川 《环境科学学报》 CAS CSCD 北大核心 2019年第9期2997-3009,共13页
采用两步浸渍-草酸盐热解法制备了均匀负载铁锰氧化物的磁性玉米芯炭(MnFeOx@CCBC),通过X射线衍射(XRD)、扫描电子显微镜(SEM)、比表面积分析仪和pH漂移实验等表征,证明制备的MnFeOx@CCBC材料表面由MnFe2O4和无定形态的δ-MnO2或水合氧... 采用两步浸渍-草酸盐热解法制备了均匀负载铁锰氧化物的磁性玉米芯炭(MnFeOx@CCBC),通过X射线衍射(XRD)、扫描电子显微镜(SEM)、比表面积分析仪和pH漂移实验等表征,证明制备的MnFeOx@CCBC材料表面由MnFe2O4和无定形态的δ-MnO2或水合氧化锰组成,pHZPC约为6.0,比表面积为3.9 m^2·g^-1.同时,比较研究了MnFeOx@CCBC和原始玉米芯炭(CCBC)对Pb^2+的吸附动力学和热力学行为.结果表明:吸附过程均符合准二级动力学方程和Langmuir等温吸附模型,在实验条件下,MnFeOx@CCBC对Pb2+的吸附速率和吸附量都明显优于CCBC,准二级动力学速率常数大3.3倍,理论平衡吸附量高6.95倍;在30℃时,MnFeOx@CCBC和CCBC的饱和吸附量分别为99.60和15.66 mg·g^-1;Pb^2+的吸附过程是熵驱动和吸热的.傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)等分析表明,MnFeOx@CCBC的主要吸附位是Mn-OH,其主要吸附机理是Pb^2+对Mn-OH中H^+的置换,并形成内层表面络合物. 展开更多
关键词 玉米芯炭 铁锰氧化物 负载 吸附作用 Pb^2+
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Improvement of stability of trivalent chromium electroplating of Ti based IrO_2+Ta_2O_5 coating anodes 认领 引用 被引量：3
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作者 LI Baosong LIN An GAN Fuxing 《Rare Metals》 SCIE EI CAS 2006年第Z1期645-649,共5页
The preparation process and properties of the thermally prepared Ti anodes coated with IrO2+Ta2O5 was studied. The structure and morphologies of the IrO2+Ta2O5 coatings were determined by XRD and SEM. Their electroche... The preparation process and properties of the thermally prepared Ti anodes coated with IrO2+Ta2O5 was studied. The structure and morphologies of the IrO2+Ta2O5 coatings were determined by XRD and SEM. Their electrochemical properties were studied by polarization curve and cyclic voltammetry. Trivalent chromium electroplating using Ti/IrO2+Ta2O5 anodes is carried out and the results were analyzed. Results show that this anode exhibits excellent electrochemical activity and stability in sulfate electrolysis. The electrocatalytic activity is determined not only by the content of IrO2 but also the structure and morphology of the anode coatings. The electroplating results indicats that Ti/IrO2+Ta2O5 anodes have excellent capabilities and merits in improving the stability of trivalent chromium electroplating in sulfate system. 展开更多
关键词 IrO2+Ta2O5 trivalent chromium electroplating oxygen evolution oxide coated anode
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Defects-Driven Ferromagnetism in Undoped Dilute Magnetic Oxides:A Review 认领 引用 被引量：4
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作者 Shuai Ning Peng Zhan +2 位作者 Qian Xie Weipeng Wang Zhengjun Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2015年第10期969-978,共10页
In the past several decades, dilute magnetic semiconductors, particularly the dilute magnetic oxides have evolved into an important branch of materials science due to their potential application in spintronic devices ... In the past several decades, dilute magnetic semiconductors, particularly the dilute magnetic oxides have evolved into an important branch of materials science due to their potential application in spintronic devices combining of properties of semiconductors and ferromagnets. In spite of a major effort devoted to the mechanism of ferromagnetism with a high Curie temperature in these materials, it still remains the most controversial research topic, especially given the unexpected do ferromagnetism in a series of undoped wide-band-gap oxides films or nanostructures. Recently, an abundance of research has shown the critical role of various defects in the origin and control of spontaneous magnetic ordering, but contradicting views from intertwined theoretical calculations and experiments require more in-depth systematic research. In our previous work, considerable efforts have been focused on two major oxides, i.e. ZnO and Zr02. This review will present a summary of current experimental status of this defect-driven ferromag- netism in dilute magnetic oxides （DMOs）. 展开更多
关键词 Dilute magnetic oxides Defects ZnO ZrO2
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两种形貌的高储电性能ZnCo2O4电极材料 认领 引用
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作者 李少琪 陈婷婷 《高师理科学刊》 2024年第4期68-72,共5页
由于ZnCo2O4具有合成方法简单、成本低廉等优点,成为超级电容器领域的一种重要电极材料.通过水热、退火两步处理,制备了两种不同形貌的ZnCo2O4材料,并在三电极体系中测试其超级电容器性能.结果表明,花状形貌的ZnCo2O_(4... 由于ZnCo2O4具有合成方法简单、成本低廉等优点,成为超级电容器领域的一种重要电极材料.通过水热、退火两步处理,制备了两种不同形貌的ZnCo2O4材料,并在三电极体系中测试其超级电容器性能.结果表明,花状形貌的ZnCo2O4纳米片微球比纳米片状ZnCo2O4的性能更好.电流密度1 A·g-1时,ZnCo2O4纳米片微球电极的比电容高达3 005.0 F·g-1;电流密度20 A·g-1时,比电容仍能保持2150.0F·g-1,电容保持率为71.5%.循环充/放电10000次后,电容保持率仍达到93.8%.该ZnCo2O4纳米片微球电极材料在超级电容器电极领域具有良好的应用前景. 展开更多
关键词 二元过渡金属氧化物 钴酸锌 超级电容器 纳米片微球
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Fabrication and Characterization of NASICON-Based CO_2 Gas Sensor 认领 引用
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作者 Yuehua He Baofu Quan Biao Wang Fengmin Liu Kuixue Liu Fabin Qiu 《稀有金属材料与工程》 SCIE EI CAS 北大核心 2006年第A3期132-135,共4页
Tube-type CO_2 gas sensors based on NASICON (Na Super Ion Conductor) material were fabricated.The material was synthesized by conventional sol-gel method,and the resulted powders were characterized by XRD.The tube-typ... Tube-type CO_2 gas sensors based on NASICON (Na Super Ion Conductor) material were fabricated.The material was synthesized by conventional sol-gel method,and the resulted powders were characterized by XRD.The tube-type CO_2 sensor was prepared with the sensing electrode Li_2CO_3-BaCO_3 binary carbonates in molar ratio 1:1.5.The concentration of CO_2 range from 300μg/g to 3000μg/g,the sensitivity of the sensor was 62.3 mV/decade.The response and recovery time (90%)corresponding to the switching change between 300μg/g and 1000μg/g CO_2 were 20 s and 2 min,respectively.If the sensing electrode was modified with binary oxides,the steady time of the sensor could be greatly reduced from 30 min to 5 min and the stability and humid-resistance of the sensor were improved. 展开更多
关键词 NASICON CO2 gas sensor binary oxides Li2CO3-BaCO3
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Selective oxidation of methanol to dimethoxymethane over V_2O_5/Ti O_2–Al_2O_3 catalysts 认领 引用 被引量：5
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作者 王拓 孟亚利 +1 位作者 曾亮 巩金龙 《Science Bulletin》 SCIE CAS CSCD 2015年第11期1009-1018,I0007,共10页
This paper describes the effect of the prepara- tion method of binary oxide supports （TiO2-Al2O3） on catalytic performance of V2O5/TiO2-Al2O3 catalysts for methanol selective oxidation to dimethoxymethane （DMM）. T... This paper describes the effect of the prepara- tion method of binary oxide supports （TiO2-Al2O3） on catalytic performance of V2O5/TiO2-Al2O3 catalysts for methanol selective oxidation to dimethoxymethane （DMM）. The TiO2-A1203 supports are synthesized by a number of methods including mechanical mixing, ball milling, precipitation, co-precipitation, and sol-gel method, which is followed by incipient wetness impregnation to produce V2O5/TiO2-Al2O3 catalysts. Among these samples, the V2O5/TiO2-Al2O3 catalyst prepared by the sol-gel method has the best catalytic performance with a maximum methanol conversion of 48.9 % and a high DMM selectivity of 89.9 % at 393 K, showing superior performance than V2O5/TiO2 and V2O5/Al2O3. The excellent catalytic performance of V2O5/TiO2-Al2O3 is attributed to the effective interaction between the active component and the mixed support. Such interaction changes the chemical states of supported active V components, produces an increased amount of V^4＋ species, and facilitates the electron transfer between support and active component. Additionally, the incorporation of titanium cation into the alumina structure could also help produce an appropriate amount of acidic sites, which increases the DMM selectivity. The coordinated environment of the dispersed vanadia on TiO2-Al2O3 mixed support improves the catalytic efficiency on methanol oxidation to DMM. 展开更多
关键词 Methanol selective oxidation Dimethoxymethane V2O5/TiO2-Al2O3 Binary oxide support
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Development of Zr/ZrO2 high temperature and high pressure sensors for in-situ measuring chemical parameters of deep-sea water 认领 引用 被引量：3
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作者 ZHANG XueTong ZHANG RongHua +1 位作者 HU ShuMin WANG Yong 《Science China(Technological Sciences)》 EI CAS 2009年第8期2466-2473,共8页
In order to in situ measure chemical parameters of deep-sea water and hydrothermal fluids at midocean ridge(MOR),it is necessary to use high temperature and high pressure chemical sensors.Developing new sensors is ess... In order to in situ measure chemical parameters of deep-sea water and hydrothermal fluids at midocean ridge(MOR),it is necessary to use high temperature and high pressure chemical sensors.Developing new sensors is essential to measure in-situ pH and other chemical parameters(dissolved H2,dissolved H2S)of deep-sea water and hydrothermal fluids in a wide temperature range(2℃―400℃)at MOR vents.The YSZ(Yttria Stabilized Zirconia,9%Y2O3)ceramic-based(HgO/Hg)chemical sensors possess excellent electrochemical properties at high temperatures,which have been used to measure chemical parameters of hydrothermal fluids above 200℃.A novel Zr/ZrO2 oxidationeduction electrode was constructed by oxidation of Zr wire in Na2CO3 melt.This Zr/ZrO2 electrode has good chemical stability while measuring pH of high-temperature aqueous solutions,combined with a Ag/AgCl reference electrode.Potentials of the Zr/ZrO2 sensor in association with a Ag/AgCl reference electrode vary linearly with pH over a wide pH range,as tested by various NaCl-HCl-H2O solutions(NaOH-NaCl-H2O for basic solutions),at temperatures in the range of 20℃―200℃.Thus,the Zr/ZrO2 sensors can be utilized in monitoring the fluids over the temperature range of 2℃―200℃.The Zr/ZrO2 electrode combined with Ag/AgCl,Ag/Ag2S,and Au electrodes has been used to measure pH and other chemical parameters(dissolved H2,dissolved H2S)of aqueous fluids from low to high temperatures and high pressures in the laboratory and to monitor those parameters of deep-sea water in South China Sea. 展开更多
关键词 Zr/ZrO2 sensor melt oxidation method high temperature and high pressure chemical parameters investigation in the deep ocean
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