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纳米TiO2-SiO2复合光催化剂在污水降解中的应用 认领 引用
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作者 王楠楠 高树会 +1 位作者 朱孟龙 彭佃钦 《工业催化》 CAS 2026年第2期73-78,共6页
污水中常含有多种复杂有机物、重金属离子等,单一催化剂难以高效降解所有污染物。通过制备纳米Ti O2-SiO2复合光催化剂,揭示复合催化剂对污水有机污染物的降解原理,为污水治理提供一种可靠的解决方案。基于Ti O2粉体和SiO2... 污水中常含有多种复杂有机物、重金属离子等,单一催化剂难以高效降解所有污染物。通过制备纳米Ti O2-SiO2复合光催化剂,揭示复合催化剂对污水有机污染物的降解原理,为污水治理提供一种可靠的解决方案。基于Ti O2粉体和SiO2粉体,利用溶胶-凝胶法制备了不同质量配比的纳米Ti O2-SiO2复合光催化剂并模拟不同pH值的污水,设定不同的光照条件,对制备的催化剂性能进行测试。在不同质量配比催化剂性能对比结果中,A4催化剂对不同pH值污水的降解率数值最大,为65.12%;在光照条件对催化剂性能的分析过程中,G006条件能够大幅降低污水中污染物的浓度,其降解率为85.15%。当光照强度为200 m W/cm2、光照时间为90min时,Ti O2质量分数为75%、SiO2质量分数为20%的复合光催化剂在污水降解处理中的应用性能最佳。 展开更多
关键词 水污染防治工程 纳米TiO2-SiO2复合催化剂 光催化 降解率 光照条件
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Oxidation behavior of C/C composites with SiC/ZrSiO_4-SiO_2 coating 认领 引用 被引量：6
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作者 李杨 肖鹏 +2 位作者 李专 罗威 周伟 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第2期397-405,共9页
A SiC/ZrSiO4？SiO2 （SZS） coating was successfully fabricated on the carbon/carbon （C/C） composites by pack cementation, slurry painting and sintering to improve the anti-oxidation property and thermal shock resist... A SiC/ZrSiO4？SiO2 （SZS） coating was successfully fabricated on the carbon/carbon （C/C） composites by pack cementation, slurry painting and sintering to improve the anti-oxidation property and thermal shock resistance. The anti-oxidation properties under different oxygen partial pressures （OPP） and thermal shock resistance of the SZS coating were investigated. The results show that the SZS coated sample under low OPP, corresponding to the ambient air, during isothermal oxidation was 0.54% in mass gain after 111 h oxidation at 1500 ° C and less than 0.03% in mass loss after 50 h oxidation in high OPP, corresponding to the air flow rate of 36 L/h. Additionally, the residual compressive strengths （RCS） of the SZS coated samples after oxidation for 50 h in high OPP and 80 h in low OPP remain about 70% and 72.5% of those of original C/C samples, respectively. Moreover, the mass loss of SZS coated samples subjected to the thermal cycle from 1500 ° C in high OPP to boiling water for 30 times was merely 1.61%. 展开更多
关键词 C/C composite SiC/ZrSiO4-SiO2 coating oxygen partial pressure anti-oxidation thermal shock residual compressive strength
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Insights into effects of ZrO2 crystal phase on syngas‐to‐olefin conversion over ZnO/ZrO2 and SAPO‐34 composite catalysts 认领 引用 被引量：7
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作者 Zhaopeng Liu Youming Ni +6 位作者 Zhongpan Hu Yi Fu Xudong Fang Qike Jiang Zhiyang Chen Wenliang Zhu Zhongmin Liu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第3期877-884,共8页
The utilization of metal oxide‐zeolite catalysts in the syngas‐to‐olefin reaction is a promising strategy for producing C2–C4 olefins from non‐petroleum resources.However,the effect of the crystal phase of ... The utilization of metal oxide‐zeolite catalysts in the syngas‐to‐olefin reaction is a promising strategy for producing C2–C4 olefins from non‐petroleum resources.However,the effect of the crystal phase of metal oxides on the catalytic activity of these oxides is still ambiguous.Herein,typical metal oxides(ZnO/ZrO2)with different crystal phases(monoclinic(m‐ZrO2)and tetragonal(t‐ZrO2))were employed for syngas conversion.The(ZnO/m‐ZrO2+SAPO‐34)composite catalyst exhibited 80.5%selectivity for C2–C4 olefins at a CO conversion of 27.9%,where the results are superior to those(CO conversion of 16.4%and C2–C4 olefin selectivity of 76.1%)obtained over(ZnO‐ZrO2+SAPO‐34).The distinct differences are ascribed to the larger number of hydroxyl groups,Lewis acid sites,and oxygen defects in ZnO/m‐ZrO2 compared to ZnO‐ZrO2.These features result in the formation of more formate and methoxy intermediate species on the ZnO/m‐ZrO2 oxides during syngas conversion,followed by the formation of more light olefins over SAPO‐34.The present findings provide useful information for the design of highly efficient ZrO2‐based catalysts for syngas conversion. 展开更多
关键词 Syngas‐to‐olefins Crystal phase ZnO/ZrO2 SAPO‐34 Composite catalyst
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Mechanical properties and plasma erosion resistance of BN_p/Al_2O_3-SiO_2 composite ceramics 认领 引用 被引量：5
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作者 段小明 贾德昌 +5 位作者 周玉 杨治华 王玉金 任凤琴 于达仁 丁永杰 《Journal of Central South University》 SCIE EI CAS 2013年第6期1462-1468,共7页
BNp/Al2O3-SiO2 system ceramic matrix composites with different volume fractions （10%-60%） of hexagonal BN particulates （BNp） were prepared by hot-press sintering technique. Phase components, microstructure, mechan... BNp/Al2O3-SiO2 system ceramic matrix composites with different volume fractions （10%-60%） of hexagonal BN particulates （BNp） were prepared by hot-press sintering technique. Phase components, microstructure, mechanical properties and plasma erosion resistance were also investigated. With the increase of h-BNp content, relative density and Vickers＇ hardness of the composite ceramics decrease, while the flexural strength, elastic modulus and fracture toughness increase and then decrease. The plasma erosion resistance linearly deteriorated with the increase of BNp content which is mainly determined by the density, crystal structure and atomic number of the elements. 展开更多
关键词 BNp/Al2O3-SiO2 composite ceramics microstructures mechanical properties plasma erosion resistance
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Catalytic decomposition of CH_4 over Ni-Al_2O_3-SiO_2 catalysts:Influence of pretreatment conditions for the production of H_2 认领 引用 被引量：2
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作者 Jangam Ashok Gangadhara Raju +2 位作者 Padigapati Shiva Reddy Machiraju Subrahmanyam Akula Venugopal 《Journal of Natural Gas Chemistry》 2008年第2期113-119,共7页
This article reports the production of COx free hydrogen and carbon nanofibers by the catalytic decomposition of methane over Ni-Al2O3-SiO2 catalysts. The influence of reaction temperature, pretreatment temperature, a... This article reports the production of COx free hydrogen and carbon nanofibers by the catalytic decomposition of methane over Ni-Al2O3-SiO2 catalysts. The influence of reaction temperature, pretreatment temperature, and effect of reductive pretreatment on the decomposition of methane activity is investigated. The physico-chemical characteristics of fresh and deactivated samples were characterized using BET-SA, XRD, TPR, SEM/TEM, CHNS analyses and correlated with the methane decomposition results obtained. The Ni-Al-Si （4 ： 0.5 ： 1.5） catalyst reduced with hydrazine hydrate produced better H2 yields of ca. 1815 mol H2/mol Ni than the catalyst reduced with 5% H2/N2. 展开更多
关键词 in situ reduction Ni-Al2O3-SiO2 catalyst methane decomposition hydrogen production carbon nanofibers
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Preparation of Al_2O_3-SiO_2-TiO_2-ZrO_2 Composite Ceramic Membranes by Sol-Gel Method 认领 引用
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作者 吴建锋 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第1期42-45,共4页
Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a nat... Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a natase), Al 2SiO 5, and ZrO 2 in these membranes. Changing the molar ratio of Al∶Si∶Ti∶Zr,the kinds and content of crystal phases of composite membranes could be different, which may lead to a variety of microstructure of membranes. The surface nanoscale topography and microstructure of membranes were investiga ted by XRD,SEM,AFM,EPMA. The effects of additives and heat treatments on the sur face nanoscale topography and microstructure of composite ceramic membranes were also analyzed. 展开更多
关键词 sol-gel method Al 2O 3-SiO 2-TiO 2-ZrO 2 composite ceramic membranes surface nanoscale topography microstructure
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PREPARATION,CHARACTERIZATION AND HYDROGENATION PROPERTY OF POLYMER-SUPPORTED Pd-Fe_2O_3 COMPOSITE CATALYSTS 认领 引用
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作者 ZHANG Shengmin HU Weibing ZHANG Manzheng Wuhan University of Technology Hubei Research Institute of Chemistry 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1999年第4期48-52,共5页
A series of polymer- supported Pd -Fe2O3 composite catalysts were prepared and their hydrogenation property mas investigated. It was found that the above catalysts have good catalytic hydrogenation activity for carbon... A series of polymer- supported Pd -Fe2O3 composite catalysts were prepared and their hydrogenation property mas investigated. It was found that the above catalysts have good catalytic hydrogenation activity for carbon - carbon double bonds systems and reusability. Furthermore, XPS and IR spectra shouted that active component in the composite catalysts is atomic Pd(0). An addition of a small amount of Fe2O3 has a promotive action upon hydrogenation activity of the catalysts, which indicated that there are some strong interactions (electron transfer) between Pd(0) and Fe(Ⅲ) species. Based on these results, a possible catalytic hydrogenation mechanism was also suggested. 展开更多
关键词 functional material polymet-sup- ported catalyst composite Pd - F2O3/polystyrene hydrogenation mechanism
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Synergistic effect of Ni2Sc and Mg2Ni on boosting the hydrogen storage kinetic performances of magnesium-nickel alloys 认领 引用
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作者 Wenchao Cao Xin Ding +3 位作者 Chenlu Wang Shiyang Hu Qiang Song Ruirun Chen 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第5期557-571,共15页
Magnesium-based hydrogen storage materials,with their high hydrogen storage capacity and favorable cost-effectiveness,are promising candidates for addressing the challenges of hydrogen energy storage and transportatio... Magnesium-based hydrogen storage materials,with their high hydrogen storage capacity and favorable cost-effectiveness,are promising candidates for addressing the challenges of hydrogen energy storage and transportation.However,their advantages are significantly hindered by high reaction temperatures and sluggish diffusion behavior in the medium-temperature range.To address the issue of sluggish dehydrogenation kinetics,a method for synergistically optimizing the de-/absorption kinetic performance by simultaneously doping with Mg2Ni and Sccontaining compounds is proposed.By leveraging differences in formation enthalpy,the synthesized material comprises Mg2Ni,Ni2Sc,and Mg phases,with the formation of Ni2Sc inducing microstructural modifications.The formation of Ni2Sc reduces the Ni concentration in the melt,causing the primary phase in the alloy to shift from Mg2Ni to Mg.The Mg85Ni14Sc1 alloy exhibits a hydrogen absorption capacity of 3.6 wt%at 100℃ within 105 min,and the hydrogen desorption rate is significantly accelerated.The Mg2Ni phase is uniformly dispersed within the hydrogen storage particles,while the Ni-Sc compounds are distributed near the particle surfaces.Theoretical calculations indicate that H atoms have lower diffusion energy barriers in Ni2Sc and Mg2Ni,with values of 1.60 eV and 1.47 eV,respectively.This arrangement synergistically enhances hydrogen molecule dissociation and atomic hydrogen recombination,resulting in accelerated reaction kinetics.The cooperative effect of these two catalytic phases effectively lowers the endothermic peak temperature of MgH2 during dehydrogenation by reducing the concentration of H atoms. 展开更多
关键词 Hydrogen storage Ni2Sc catalyst Composite material Synergetic effect Hydrogenation kinetics.
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Zn(Ac)2-MgFe2O4复合催化剂的制备及有色涤纶一体化醇解脱色 认领 引用
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作者 朱亚楠 徐艺倩 李雯娟 《服装学报》 CAS 北大核心 2026年第1期1-10,共10页
为进一步提高有色涤纶醇解脱色效率,利用硅烷偶联剂KH560作为界面改性剂,制备Zn(Ac)2-MgFe2O4复合催化剂,对复合催化剂的形貌、元素、热稳定性、磁性能及催化醇解脱色能力进行表征;采用多因素实验探究有色涤纶的醇解条件。结... 为进一步提高有色涤纶醇解脱色效率,利用硅烷偶联剂KH560作为界面改性剂,制备Zn(Ac)2-MgFe2O4复合催化剂,对复合催化剂的形貌、元素、热稳定性、磁性能及催化醇解脱色能力进行表征;采用多因素实验探究有色涤纶的醇解条件。结果表明,偶联剂质量分数为1.0%时,复合催化剂的分散性能最好,且热化学性能稳定;当MgFeO4与Zn(Ac)2的质量比为1:3时,复合催化剂对涤纶的降解率及脱色率分别可达到98.9%和78.2%;复合催化剂质量分数为1.0%、反应温度为196℃、反应时间为180min,且乙二醇与涤纶的质量比为5:1时,涤纶的醇解脱色效果最佳;该复合催化剂经5次回收后,仍保持较高的稳定性和回收率,对有色涤纶的降解率可达到96.0%。 展开更多
关键词 乙酸锌 铁酸镁 复合催化剂 醇解脱色 有色涤纶降解
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负载金属催化剂的褐煤基活性半焦脱除烟气中CO2的性能及机制研究 认领 引用
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作者 白玉伟 芦娟 杨宁 《河南化工》 CAS 2026年第5期40-43,共4页
设计并开展了采用复合金属CuFe催化剂改性活性半焦用于CO2脱除的实验研究。深入评价了其在模拟烟气条件下的CO2动态吸附性能、转化活性及循环稳定性;结合多种表征手段,阐明CuFe活性组分与半焦载体之间的相互作用机制,以及CO2... 设计并开展了采用复合金属CuFe催化剂改性活性半焦用于CO2脱除的实验研究。深入评价了其在模拟烟气条件下的CO2动态吸附性能、转化活性及循环稳定性;结合多种表征手段,阐明CuFe活性组分与半焦载体之间的相互作用机制,以及CO2在复合材料表面的吸附-转化协同路径。本研究为开发低成本、高效率的CO2干法脱除新材料提供实验依据和理论支撑,也为半焦这一大宗工业固废的高值化资源利用开辟新途径,对推动我国CCUS技术发展、助力“双碳”目标实现具有重要的意义。 展开更多
关键词 复合金属催化剂 褐煤活性半焦 脱除CO2 性能 机制
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Peroxymonosulfate Activation by CoFe2O4/MgAl-LDH Catalyst for the Boosted Degradation of Antibiotic 认领 引用
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作者 LI Jianjun CHEN Fangming +5 位作者 ZHANG Lili WANG Lei ZHANG Liting CHEN Huiwen XUE Changguo XU Liangji 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2025年第4期440-448,I0022-I0024,共9页
Owing to outstanding hydrophilicity and ionic interaction,layered double hydroxides(LDHs)have emerged as a promising carrier for high performance catalysts.However,the synthesis of new specialized catalytic LDHs for d... Owing to outstanding hydrophilicity and ionic interaction,layered double hydroxides(LDHs)have emerged as a promising carrier for high performance catalysts.However,the synthesis of new specialized catalytic LDHs for degradation of antibiotics still faces some challenges.In this study,a CoFe2O4/MgAl-LDH composite catalyst was synthesized using a hydrothermal coprecipitation method.Comprehensive characterization reveals that the surface of MgAl-LDH is covered with nanometer CoFe2O4 particles.The specific surface area of CoFe2O4/MgAl-LDH is 82.84 m2·g-1,which is 2.34 times that of CoFe2O4.CoFe2O4/MgAl-LDH has a saturation magnetic strength of 22.24 A·m2·kg-1 facilitating efficient solid-liquid separation.The composite catalyst was employed to activate peroxymonosulfate(PMS)for the efficient degradation of tetracycline hydrochloride(TCH).It is found that the catalytic performance of CoFe2O4/MgAl-LDH significantly exceeds that of CoFe2O4.The maximum TCH removal reaches 98.2%under the optimal conditions([TCH]=25 mg/L,[PMS]=1.5 mmol/L,CoFe2O4/MgAl-LDH=0.20 g/L,pH 7,and T=25℃).Coexisting ions in the solution,such as SO42-,Cl-,H2PO4-,and CO32-,have a negligible effect on catalytic performance.Cyclic tests demonstrate that the catalytic performance of CoFe2O4/MgAl-LDH remains 67.2%after five cycles.Mechanism investigations suggest that O2•-and 1O2 produced by CoFe2O4/MgAl-LDH play a critical role in the catalytic degradation. 展开更多
关键词 magnetic composite catalyst peroxymonosulfate CoFe2O4/MgAl-LDH advanced oxidation process antibiotic
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Novel promoting effects of cerium on the activities of NO_x reduction by NH_3 over TiO_2-SiO_2-WO_3 monolith catalysts 认领 引用 被引量：15
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作者 房志涛 林涛 +3 位作者 徐海迪 吴干学 孙萌萌 陈耀强 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第10期952-959,共8页
A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic re... A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic reduction（SCR） performance and SO2-resistant ability of TiO2-SiO2-WO3 were greatly enhanced by the introduction of cerium. The catalyst containing 10% CeO2 showed the highest NO conversion in a wide temperature range and good N2 selectivity with broad operation temperature window at the gas hourly space velocity（GHSV） of 30000 h–1, which was a very promising catalyst for NOx abatement from diesel engine exhaust. The catalysts were characterized by X-ray diffraction（XRD）, scanning electron microscopy with energy dispersive X-ray spectroscopy（SEM-EDS）, N2 adsorption-desorption（BET） and X-ray photoelectron spectroscopy（XPS）. The characterization results showed that the bigger pore radius, higher surface atomic concentration and dispersion of Ce and the abundant adsorbed oxygen on the surface of catalyst contributed to the best NH3-SCR performance of CeO2/TiO2-SiO2-WO3 catalyst containing 10% CeO2. 展开更多
关键词 NH3-SCR NO cerium CeO2/TiO2-SiO2-WO3 monolith catalyst rare earths
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CO2与环氧化物环加成反应:多功能复合催化剂的设计、协同机制与应用前景 认领 引用
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作者 王泽平 袁俊聪 +2 位作者 付然飞 赵辉 冯翔 《化工学报》 EI CAS CSCD 北大核心 2026年第6期3005-3027,共23页
二氧化碳(CO2)与环氧化物环加成制备环状碳酸酯,是实现CO2资源化利用的重要途径之一。CO2分子固有的化学惰性是其高效资源化利用的核心难题。为突破传统单一功能催化剂的性能瓶颈,研究重点已转向能够协同整合多种活性位点(如Le... 二氧化碳(CO2)与环氧化物环加成制备环状碳酸酯,是实现CO2资源化利用的重要途径之一。CO2分子固有的化学惰性是其高效资源化利用的核心难题。为突破传统单一功能催化剂的性能瓶颈,研究重点已转向能够协同整合多种活性位点(如Lewis酸性位点、亲核试剂及氢键供体)的多功能复合催化剂。基于此系统分析了该领域内4类代表性催化剂的研究进展:金属-有机杂化催化剂(如卟啉/Salen配合物、MOFs)借助分子尺度的精准结构调控,实现了高效的协同催化作用;有机-无机杂化催化剂通过功能化修饰,在维持高催化活性的同时显著增强了结构稳定性;碳基杂化材料借助杂原子掺杂和单原子位点构筑策略,显著提升了催化活性位点的活性;特别值得关注的是,新兴的核-壳型结构催化剂,通过结构设计实现了功能位点的空间分工与界面协同,标志着催化设计理念的重要飞跃。这些从“位点协同”到“结构协同”的递进式研究为CO2的高效转化提供了新思路,也为其绿色工业化应用奠定了理论和材料基础。 展开更多
关键词 二氧化碳固定 环氧化物 环加成反应 多功能复合催化剂 环状碳酸酯
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骨架结构与碳复合共调控提升催化剂对CO2的吸附与催化转化 认领 引用
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作者 刘心茹 徐怡翎 +4 位作者 聂乐愉 余微微 夏凯 陈照军 孙德帅 《洁净煤技术》 CAS CSCD 北大核心 2026年第3期142-149,共8页
工业烟气中CO2捕获与一体化催化转化是当前的研究热点,金属有机骨架(MOFs)材料在CO2吸附分离领域得到了广泛应用。为了改善铜基金属有机骨架吸附催化剂的耐水稳定性,采用模板剂(AspCuTEA)调控MOFs合成。使用AspCuTEA与碳气凝胶(C... 工业烟气中CO2捕获与一体化催化转化是当前的研究热点,金属有机骨架(MOFs)材料在CO2吸附分离领域得到了广泛应用。为了改善铜基金属有机骨架吸附催化剂的耐水稳定性,采用模板剂(AspCuTEA)调控MOFs合成。使用AspCuTEA与碳气凝胶(CCA)复合共调控复合吸附催化剂(AspCuTEA-CCA)结构,提升CO2吸附与催化转化性能。在循环固定床中,AspCuTEA-CCA用于CO2吸附分离后,直接与环氧氯丙烷进行环加成反应制备环状碳酸酯。吸附结果表明:AspCuTEACCA对纯CO2和15%CO2的饱和吸附量达到386和198 mg/g,在少量水存在的情况下能促进CO2的吸收。吸附后的CO2直接催化转化为环状碳酸酯的转化率达到93.6%。10次吸脱附循环和3次的催化转化循环不影响AspCuTEA-CCA结构,AspCuTEA-CCA表现出了良好的结构稳定性和吸附催化稳定性,具有工业化应用的潜力。 展开更多
关键词 碳气凝胶 金属有机骨架 复合吸附转化剂 CO2捕获 催化转化
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Silica supported perchloric acid(HClO_4-SiO_2):A mild,reusable and highly efficient heterogeneous catalyst for the synthesis of amidoalkyl naphthols 认领 引用 被引量：8
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作者 Gholam Hossein Mahdavinia Mohammad A.Bigdeli Majid M.Heravi 《Chinese Chemical Letters》 SCIE CAS 2008年第10期1171-1174,共4页
An efficient and direct procedure has been developed for the preparation of amidoalkyl naphthols by a one-pot condensation of aryl aldehydes, 2-naphthol and urea or amides, in the presence of HClO4-SiO2 as a heterogen... An efficient and direct procedure has been developed for the preparation of amidoalkyl naphthols by a one-pot condensation of aryl aldehydes, 2-naphthol and urea or amides, in the presence of HClO4-SiO2 as a heterogeneous catalyst. The reactions were carried out under reflux and solvent-free conditions. The present methodology offers several advantages such as excellent yields, simple procedure, easy work-up and ecofriendly reaction condition. The catalyst is easily prepared, stable, reusable and efficient under the reaction conditions. 展开更多
关键词 One-pot HClO4-SiO2 Heterogeneous catalyst Amidoalkyl naphthol Multicomponent reaction
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Photocatalytic activity and kinetics for acid yellow degradation over surface composites of TiO_2-coated activated carbon under different photocatalytic conditions 认领 引用 被引量：4
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作者 曾孟雄 李佑稷 +2 位作者 马明远 陈伟 李雷勇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第4期1019-1027,共9页
TiO2-coated activated carbon surface （TAs） composites were prepared by a sol-gel method with supercritical pretreatment. The photocatalytic degradation of acid yellow （AY） was investigated under UV radiation to es... TiO2-coated activated carbon surface （TAs） composites were prepared by a sol-gel method with supercritical pretreatment. The photocatalytic degradation of acid yellow （AY） was investigated under UV radiation to estimate activity of catalysts and determine the kinetics. And the effects of parameters including the initial concentration of AY, light intensity and TiO2 content in catalysts were examined. The results indicate that TAs has a higher efficiency in decomposition of AY than P25, pure TiO2 particles as well as the mixture of TiO2 powder and active carbon. The photocatalytic degradation rate is found to follow the pseudo-first order kinetics with respect to the AY concentration. The new kinetic model fairly resembles the classic Langmuir-Hinshelwood equation, and the rate constant is proportional to the square root of the light intensity in a wide range. However, its absorption performance depends on the surface areas of catalysts. The model fits quite well with the experimental data and elucidates phenomena about the effects of the TiO2 content in TAs on the degradation rate. 展开更多
关键词 photocatalysis TiO2-coated activated carbon acid yellow composite catalyst
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ZnO-TiO_2-SiO_2复合催化剂作用下碳酸二甲酯的合成 认领 引用 被引量：4
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作者 郭效军 张容 +3 位作者 张力 严军 鲁勇齐 李治霖 《西北师范大学学报（自然科学版）》 CAS 北大核心 2009年第3期69-73,共5页
通过溶胶-凝胶法制得了复合催化剂ZnO-TiO2-SiO2,采用XRD和FT-IR进行了表征,并对其催化合成碳酸二甲酯(DMC)的活性进行了测试.结果表明,ZnO-TiO2-SiO2催化剂在焙烧温度为350℃,催化剂用量为反应体系总质量的2%,反应时间为6h,反应温度为... 通过溶胶-凝胶法制得了复合催化剂ZnO-TiO2-SiO2,采用XRD和FT-IR进行了表征,并对其催化合成碳酸二甲酯(DMC)的活性进行了测试.结果表明,ZnO-TiO2-SiO2催化剂在焙烧温度为350℃,催化剂用量为反应体系总质量的2%,反应时间为6h,反应温度为160℃,甲醇与尿素摩尔比为14时,DMC的最高收率为12.3%. 展开更多
关键词 溶胶-凝胶法 ZnO-TiO2-SiO2复合催化剂 碳酸二甲酯 催化活性
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Effect of calcination temperature on structure and performance of Ni/TiO_2-SiO_2 catalyst for CO_2 reforming of methane 认领 引用 被引量：6
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作者 Sanbing Zhang Jiankang Wang Xiaolai Wang 《Journal of Natural Gas Chemistry》 2008年第2期179-183,共5页
The influence of calcination temperature on the structure and catalytic behavior of Ni/TiO2-SiO2 catalyst, for CO2 reforming of methane to synthesis gas under atmospheric pressure, was investigated. The results showed... The influence of calcination temperature on the structure and catalytic behavior of Ni/TiO2-SiO2 catalyst, for CO2 reforming of methane to synthesis gas under atmospheric pressure, was investigated. The results showed that the Ni/TiO2-SiO2 catalyst calcined at 700 ℃ had high and stable activity while the catalysts calcined at 550 and 850 ℃ had low and unstable activity. Depending on the calcination temperature, one, two, or three of the following Ni-containing species, NiO, Ni2.44Ti0.72Si0.07O4, and NiTiO3 were identified by combining the temperature programmed reduction （TPR） and X-ray diffraction （XRD） results. Their reducibility decreased in the sequence： NiO〉Ni2.44Ti0.72Si0.07O4〉NiTiO3. It suggests that high and stable activities observed over the Ni/TiO2-SiO2 catalyst calcined at 700 ~C were induced by the formation of Ni2.44Ti0.72Si0.07O4 and smaller NiO species crystallite size. 展开更多
关键词 Ni/TiO2-SiO2 catalyst sol-gel CO2 reforming methane
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Selective Hydrogenation of Butyne-1,4-diol to Butane-1,4-diol over Ni/Al_2O_3-SiO_2 Catalysts 认领 引用 被引量：2
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作者 Fang Jie Zhuang Changjian +2 位作者 Meng Jipeng Cheng Lang Lu Jiangyin 《China Petroleum Processing & Petrochemical Technology》 CAS 2018年第4期20-28,共9页
Ni/Al_2O_3-SiO_2 catalysts were synthesized via one-step method employing SiO_2 as an additive for the selective hydrogenation of butyne-1,4-diol(B_3D) to butane-1,4-diol(B1D). The prepared catalysts were evaluated by... Ni/Al_2O_3-SiO_2 catalysts were synthesized via one-step method employing SiO_2 as an additive for the selective hydrogenation of butyne-1,4-diol(B_3D) to butane-1,4-diol(B1D). The prepared catalysts were evaluated by a series of characterization techniques including BET, XRD, SEM, EDX-mapping, TEM, H_2-TPR, XPS, NH_3-TPD and Py-FTIR. Compared to Ni/Al_2O_3 catalyst, the SiO_2-doped samples exhibited better B_3D conversion. SiO_2 could help to form a strong interaction between NiO with the support, which inhibited Ni agglomeration at high temperature, improved the Ni dispersion, and enhanced the hydrogenation activity. B_1D selectivity was mainly influenced by the quantity of Lewis acid sites in addition to the Ni dispersion. The catalyst with a silica loading of 6.4% demonstrated an excellent selectivity of 75.18%(by 13% higher than the contrastive Ni/Al_2O_3 catalyst), which was attributed to the larger amount of Lewis acid sites and the moderate interaction between NiO with the support, which could facilitate the nickel dispersion on a preferable surface area of 176.3 m^2/g of support. 展开更多
关键词 Ni/Al2O3-SiO2 catalysts butyne-1,4-diol butane-1,4-diol hydrogenation
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Hydrogenation properties of mechanically milled Mg_2Ni0.8Cr0.2-CoO/Al_2O_3 composites 认领 引用 被引量：1
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作者 王秀丽 涂江平 +2 位作者 陈长聘 张孝彬 赵新兵 《Journal of Zhejiang University-SCIENCE B》 EI CAS 2005年第3期208-212,共5页
Mg2Ni0.8Cr0.2-x wt.% CoO/Al2O3 (x=0.5, 1, 2 and 3) composites were prepared by mechanically milling sintered Mg2Ni0.8Cr0.2 alloy and CoO/Al2O3 compound for 45 h. The addition of CoO/Al2O3 compound resulted in the good... Mg2Ni0.8Cr0.2-x wt.% CoO/Al2O3 (x=0.5, 1, 2 and 3) composites were prepared by mechanically milling sintered Mg2Ni0.8Cr0.2 alloy and CoO/Al2O3 compound for 45 h. The addition of CoO/Al2O3 compound resulted in the good kinetics properties of hydriding/dehydriding reaction of the composites. The composite with 1.0 wt.% CoO/Al2O3 catalyst could reach the maximum hydrogen absorption capacity (2.9 wt.%) within 5 min at 393 K under H2 pressure of 4 MPa, and can desorb rapidly at 493 K. The decomposition and synthesis of hydrogen molecule on Mg2Ni0.8Cr0.2 alloy surface was promoted by addition of CoO/Al2O3 catalyst. In addition, the formation of metallic Ni particles, strain and defects during the ball milling process also resulted in the improved hydrogenation performance of Mg2Ni-based alloys. 展开更多
关键词 Mg2Ni-based composite Hydrogen storage Ball milling Catalyst Hydriding/dehydriding kinetics
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