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HMX/Fe2O3/炭黑复合含能材料的制备及其激光点火性能测试 认领 引用
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作者 杨全成 郭天冰 +1 位作者 齐秀芳 郭红莉 《材料科学》 2026年第4期187-201,共15页
以催化效果良好的Fe2O3及吸光性能良好的炭黑作HMX复合含能材料的复合成分,并加入适量的氟橡胶作黏结剂,采用溶剂–非溶剂法结合超声震荡的方法制备HMX/Fe2O3/炭黑复合含能材料,以改善HMX的激光点火性能。通过扫描电镜(SEM)、X-射线粉... 以催化效果良好的Fe2O3及吸光性能良好的炭黑作HMX复合含能材料的复合成分,并加入适量的氟橡胶作黏结剂,采用溶剂–非溶剂法结合超声震荡的方法制备HMX/Fe2O3/炭黑复合含能材料,以改善HMX的激光点火性能。通过扫描电镜(SEM)、X-射线粉末衍射(XRD)、红外光谱(FT-IR)、紫外漫反射(UV-Vis-DRS)对复合物进行形貌表征,并对其进行1064 nm激光点火性能测试,结果表明:复合物中的HMX晶型为β型,且颗粒大小分布均匀,粒径在30 μm~60 μm区间内;炭黑能改善HMX基复合含能材料对光的吸收效果,炭黑含量为0.2%的HMX复合药剂对1064 nm波长的光吸收率为47.79%,而炭黑含量为1%的HMX复合药剂对1064 nm波长的光吸收率增加到了59.71%;加入Fe2O3能提高HMX基复合含能材料的质量燃速,仅加入质量分数1%的炭黑的HMX复合药剂质量燃速为0.0279 g·cm−2·s−1,燃速较小,继续向其中分别引入质量分数为1%、2%、3%的Fe2O3后,药剂质量燃速分别提高到了0.0374、0.0524、 0.0796 g·cm−2·s−1。在各组药剂中,各组分质量比(HMX:Fe2O3:炭黑:氟橡胶)为94:3:1:2的HMX复合药剂激光点火效果最好,药剂能够稳定燃烧,还赋予药剂较高的质量燃速0.0796 g·cm−2·s−1。 展开更多
关键词 复合含能材料 激光点火 HMX 溶剂–非溶剂 HMX/Fe2O3/炭黑
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超高温油基钻井液用新型Fe2O3-CQDs封堵材料研究 认领 引用
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作者 郭建华 范炜昊 谢慧华 《能源化工》 CAS 2026年第3期58-64,共7页
为解决超高温环境中油基钻井液处理剂易失效的问题,通过在金属氧化物Fe2O3表面生长碳量子点(CQDs),研制出新型纳米Fe2O3-CQDs封堵材料。XRD、FT-IR、XPS表征结果显示CQDs紧密附着在Fe2O3表面且二者之间存在稳定的相互作用,SEM表征结果显... 为解决超高温环境中油基钻井液处理剂易失效的问题,通过在金属氧化物Fe2O3表面生长碳量子点(CQDs),研制出新型纳米Fe2O3-CQDs封堵材料。XRD、FT-IR、XPS表征结果显示CQDs紧密附着在Fe2O3表面且二者之间存在稳定的相互作用,SEM表征结果显示Fe2O3-CQDs封堵材料的平均粒径约为200 nm,TG表征结果显示该材料的热分解温度不低于344℃。将Fe2O3-CQDs封堵材料加入柴油基钻井液中进行初步评价,发现添加质量分数4%封堵材料的油基钻井液在220℃老化16 h后的高温高压滤失量由8.2 mL降低至4 mL,滤饼厚度由5.0 mm降至1.5 mm,具有优异的降滤失与封堵性能。 展开更多
关键词 钻井液 封堵材料 Fe2O3 CQDs
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Tri-functional Ru catalyst drives efficient ammonia synthesis from N2 and H2O 认领 引用
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作者 Ying Hou Wei Hu +6 位作者 Qiao Zhao Yuchuan Tu Guang Yang Yi Cui Wei Liu Liang Yu Dehui Deng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第7期769-775,I0018,共7页
1.Indroduction In light of the global transition toward carbon neutrality,the development of mild-condition ammonia synthesis technologies has gained significant attention as a promising solution to address the inhere... 1.Indroduction In light of the global transition toward carbon neutrality,the development of mild-condition ammonia synthesis technologies has gained significant attention as a promising solution to address the inherent limitations of the traditional Haber-Bosch approach,which remains highly energy-intensive due to the extreme operation conditions(above 350℃ and over 10 MPa)required to activate the robust N≡N bond(945 kJ mol-1).Furthermore,the process is carbon-intensive,as its primary hydrogen source is derived from hydrocarbon reforming with high carbon emissions[1,2]. 展开更多
关键词 NH3 synthesis N and H2O Tri-functional Ru-based catalyst Reversible Li battery
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Fe/Mg改性γ-Al2O3复合吸附剂硒吸附性能研究 认领 引用
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作者 谷梦瑶 郭士豪 +3 位作者 樊昊天 刘皓 陈娟 姚洪 《燃烧科学与技术》 CAS CSCD 北大核心 2025年第4期435-442,共8页
通过浸渍法制备不同摩尔比的Fe/γ-Al2O3复合吸附剂及Mg/Al/Fe三元复合吸附剂,并在固定床上进行硒吸附实验.探讨400~700℃下Fe/γ-Al2O3吸附剂的吸附性能及H2O浓度对两种吸附剂硒吸附特性的影响.结果表明,在500℃、8%H_(... 通过浸渍法制备不同摩尔比的Fe/γ-Al2O3复合吸附剂及Mg/Al/Fe三元复合吸附剂,并在固定床上进行硒吸附实验.探讨400~700℃下Fe/γ-Al2O3吸附剂的吸附性能及H2O浓度对两种吸附剂硒吸附特性的影响.结果表明,在500℃、8%H2O条件下,Fe/Al摩尔比为1∶10的吸附剂表现出最佳硒吸附性能,吸附量为10.968 mg/g,而Mg/Al/Fe吸附剂在20%H2O条件下硒吸附性能最佳,吸附量为9.7606 mg/g.XPS结果显示,烟气中的SeO2与Mg/Al/Fe吸附剂表面的晶格氧结合,提高吸附剂表面的氧缺陷,从而改善吸附性能. 展开更多
关键词 硒 Fe/γ-Al2O3复合吸附剂 吸附性能 H2O
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Fe基分子筛催化剂应用于NH3选择性催化还原和N2O直接催化分解反应的研究进展 认领 引用 被引量：1
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作者 明淑君 李新楠 +4 位作者 庞磊 苏长罗 程春晖 杨小东 李涛 《低碳化学与化工》 CAS 北大核心 2025年第6期97-112,共16页
柴油车排放的氮氧化物(NOx)和氧化亚氮(N2O)对人类健康和生态环境造成了显著危害。NH3选择性催化还原(NH3-SCR)技术是当前控制柴油车尾气中NOx排放的有效方法之一,而N2O的直接催化分解(简称“N2O分解”)则被认为... 柴油车排放的氮氧化物(NOx)和氧化亚氮(N2O)对人类健康和生态环境造成了显著危害。NH3选择性催化还原(NH3-SCR)技术是当前控制柴油车尾气中NOx排放的有效方法之一,而N2O的直接催化分解(简称“N2O分解”)则被认为是减少N2O排放的最具潜力的技术。这两种技术的核心均依赖于催化剂的开发与应用。Fe基分子筛催化剂在NH3-SCR和N2O分解反应中展现出了卓越的催化性能,为实现NOx和N2O的同步高效去除提供了一条有前途的路径。综述了Fe基分子筛催化剂在NH3-SCR和N2O分解反应中的催化机理,探讨了Fe基分子筛催化剂的制备方法、拓扑结构、助剂金属掺杂,以及反应环境中共存气体对其理化性质、NH3-SCR活性和N2O分解性能的影响。具体而言,Fe基分子筛催化剂的Fe物种形成与分布受到制备方法和分子筛拓扑结构的显著影响。助剂金属的引入不仅能够增大催化剂的酸性位点含量,还能改善Fe物种的分散性,从而优化其催化性能。此外,共存气体(如NO、O2和H2O)对Fe基分子筛催化剂的N2O分解活性产生不同程度的影响。最后,对Fe基分子筛催化剂的未来研究方向进行了展望,并对催化剂设计优化与性能提升提出了建议。 展开更多
关键词 Fe基分子筛催化剂 NH3-SCR N2O直接催化分解 催化机理
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Preparation and characterization of Fe_2O_3-CeO_2-TiO_2/γ-Al_2O_3 catalyst for degradation dye wastewater 认领 引用 被引量：6
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作者 LIU Yan SUN De-zhi CHENG Lin LI Yan-ping 《Journal of Environmental Sciences》 SCIE EI CAS 2006年第6期1189-1192,共4页
In order to develop a catalyst with high activity for catalytic wet oxidation （CWO） process at room temperature and atmospheric pressure, Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst was prepared by consecutive impregnation me... In order to develop a catalyst with high activity for catalytic wet oxidation （CWO） process at room temperature and atmospheric pressure, Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst was prepared by consecutive impregnation method and the prepared parameters were optimized. The structure of the catalyst was characterized by BET, XRF, SEM and XPS technologies, and the actual wastewater was used to investigate the catalytic activity of Fe2O3-CeO2-TiO2/γ-Al2O3 in CWO process. The experimental results showed that the prepared catalyst exhibited good catalytic activity when the doping amount of Ti was 1.0 wt% （the weight ratio of Ti to carriers）, and the middle product, Fe2O3-CeO2-TiO2/γ-Al2O3, was calcined in 450℃ for 2 h. The CWO experiment for treating actual dye wastewater indicated that the COD, color and TOC of actual wastewater were decreased by 62.23%, 50.12% and 41.26% in 3 h, respectively, and the ratio of BOD5/COD was increased from 0.19 to 0.30. 展开更多
关键词 catalytic wet oxidation （CWO） Fe2O3-CeO2-TiO2/γ-Al2O3 catalyst dye wastewater treatment
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Utilization of steelwork off-gases through methanol synthesis:Sulfur-induced dynamic migration of ZnOx over industrial Cu/ZnO/Al2O3 catalyst and the poisoning mechanism 认领 引用
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作者 Yukun Tian Yu Zeng +5 位作者 Ziyang Chen Hua Tong Ming Chen Zhiyong Zhong Daiqi Ye Limin Chen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第12期659-673,共15页
The reduction of carbon emissions in the steel industry is a significant challenge,and utilizing CO2 from carbon intensive steel industry off-gases for methanol production is a promising strategy for decarbonizatio... The reduction of carbon emissions in the steel industry is a significant challenge,and utilizing CO2 from carbon intensive steel industry off-gases for methanol production is a promising strategy for decarbonization.However,steelwork off-gases typically contain various impurities,including H2S,which can deactivate commercial methanol synthesis catalysts,Cu/ZnO/Al2O3(CZA).Reverse water-gas shift(RWGS)reaction is the predominant side reaction in CO2 hydrogenation to methanol which can occur at ambient pressure,enabling the decouple of RWGS from methanol production at high pressure.Then,a series of activated CZA catalysts has been in-situ pretreated in 400 ppm H2S/Ar at 250℃and tested for both RWGS reaction at ambient pressure and CO2 hydrogenation to methanol at high pressure.An innovative decoupling strategy was employed to isolate the RWGS reaction from the methanol synthesis process,enabling the investigation of the evolution of active site structures and the poisoning mechanism through elemental analysis,X-ray Diffraction,X-ray Photoelectron Spectroscopy,Fourier Transform Infrared Spectroscopy,Temperature Programmed Reduction and CO2 Temperature Programmed Desorption.The results indicate that there are different dynamic migration behaviors of ZnOx in the two reaction systems,leading to different poisoning mechanisms.These interesting findings are beneficial to develop sulfur resistant and durable highly efficient catalysts for CO2 hydrogenation to methanol,promoting the carbon emission reduction in steel industry. 展开更多
关键词 Steelwork off-gases CO2hydrogenation to methanol H2S Cu/Zn O/Al2O3catalysts ZnOxmigration Deactivation and promotion mechanisms
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微纳米添加剂α-Al2O3在表面涂层领域的应用现状及市场前景 认领 引用
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作者 伏建康 杨茂盏 +2 位作者 冉长荣 郭太雄 张千峰 《材料科学》 2025年第3期468-475,共8页
微纳米α-Al2O3是一种重要的功能材料,因其优异的硬度、耐磨性、耐腐蚀性和高热稳定性,在表面涂层领域得到了广泛应用。随着微纳米技术的发展,微纳米级α-Al2O3作为添加剂在各涂层体系中的应用得到了深入研究,显示出其能够显著改善涂层... 微纳米α-Al2O3是一种重要的功能材料,因其优异的硬度、耐磨性、耐腐蚀性和高热稳定性,在表面涂层领域得到了广泛应用。随着微纳米技术的发展,微纳米级α-Al2O3作为添加剂在各涂层体系中的应用得到了深入研究,显示出其能够显著改善涂层性能的潜力。微纳米α-Al2O3颗粒具有较大的比表面积和表面活性,能够增强涂层的机械性能,如硬度和耐磨性,同时提高涂层的耐腐蚀性和耐高温性能。微纳米α-Al2O3也是一种极优良的改性材料,其与有机硅烷、树脂等材料复合改性,既能大幅提升转化膜的应用效果,对其稳定性和耐候性也有较大的促进作用。在金属表面涂层、陶瓷涂层以及复合材料涂层中,微纳米α-Al2O3添加剂被广泛用于提高涂层的使用寿命和稳定性。此外,它在电子器件、航天航空和汽车工业等高技术领域也展现了广阔的应用前景。未来,随着表面技术的发展,微纳米α-Al2O3无铬钝化领域的市场应用将大幅增长,与其他功能性材料的协同作用和复合材料开发也将成为研究的重点。Micro-nano α-Al2O3 is an important functional material, because of its excellent hardness, wear resistance, corrosion resistance and high thermal stability, has been widely used in the field of surface coating. With the development of micro-nano technology, the application of micro-nano α-Al2O3 as an additive in various coating systems has been deeply studied, showing its potential to significantly improve coating properties. Micro-nano α-Al2O3 particles have a large specific surface area and surface activity, which can enhance the mechanical properties of the coating, such as hardness and wear resistance, while improving the corrosion resistance and high temperature resistance of the coating. Micro-nano α-Al2O3 is also an excellent modified material, and its composite modification with organosilane, resin and other materials can greatly improve the application effect of conversion film, and also has a greater role in promoting its stability and weather resistance. In metal surface coatings, ceramic coatings and composite coatings, micro-nano α-Al2O3 additives are widely used to improve the service life and stability of coatings. In addition, it also shows broad application prospects in high-tech fields such as electronic devices, aerospace and automotive industries. In the future, with the development of surface technology, the market application of micro-nano α-Al2O3 chromium-free passivation will grow significantly, and the synergy with other functional materials and the development of composite materials will also become the focus of research. 展开更多
关键词 纳米α-Al2O3 无铬钝化涂层 陶瓷膜 表面硬度 耐蚀性
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Support Effects on Thiophene Hydrodesulfurization over Co-Mo-Ni/Al_2O_3 and Co-Mo-Ni/TiO_2-Al_2O_3 Catalysts 认领 引用 被引量：12
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作者 刘超 周志明 +2 位作者 黄永利 程振民 袁渭康 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第4期383-391,共9页
A carbon-based sulfonated catalyst was prepared by direct sulfonation and carbonization （in moderate conditions：200 ＆#176;C, 12 h） of red liquor solids, a by-product of paper-making process. The prepared sulfonate... A carbon-based sulfonated catalyst was prepared by direct sulfonation and carbonization （in moderate conditions：200 ＆#176;C, 12 h） of red liquor solids, a by-product of paper-making process. The prepared sulfonated cata-lyst （SC） had aromatic structure, composed of carbon enriched inner core, and oxygen-containing （SO3H, COOH, OH） groups enriched surface. The SO3H, COOH, OH groups amounted to 0.74 mmol·g^-1, 0.78 mmol·g^-1, 2.18 mmol·g^-1, respectively. The fresh SC showed much higher catalytic activity than that of the traditional solid acid catalysts （strong-acid 732 cation exchange resin, hydrogen type zeolite socony mobile-five （HZSM-5）, sulfated zir-conia） in esterification of oleic acid. SC was deactivated during the reactions, through the mechanisms of leaching of sulfonated species and formation of sulfonate esters. Two regeneration methods were developed, and the catalytic activity can be mostly regenerated by regeneration Method 1 and be fully regenerated by regeneration Method 2, respectively. 展开更多
关键词 hydrodesulfurization support hierarchically macro-/mesoporous structure Al2O3 TiO2-Al2O3
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Sulfur poisoning and regeneration of MnO_x-CeO_2-Al_2O_3 catalyst for soot oxidation 认领 引用 被引量：12
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作者 吴晓东 李亨烈 +1 位作者 刘爽 翁端 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第7期659-664,共6页
MnOx-CeO2-Al2O3 mixed oxides were prepared by impregnating manganese and cerium precursors on alumina powders via a sol- gel deposition method. The oxide catalyst exhibited a poor resistance to sulfur dioxide after th... MnOx-CeO2-Al2O3 mixed oxides were prepared by impregnating manganese and cerium precursors on alumina powders via a sol- gel deposition method. The oxide catalyst exhibited a poor resistance to sulfur dioxide after the treatment in 100 ppm SO2/air at 350 °C for 50 h. The formation of manganese sulfate and especially cerium sulfate reduced the availability of surface active metal oxides, blocked the pore structure and decreased the surface area of the catalyst. These changes in chemical and structural and textural properties resulted in a severe loss in the activities of the sulfated catalyst for NO and soot oxidation. The decomposition of sulfates was almost complete during the calcina-tion in air at 800 °C for 30 min, which partially recovered the surface active sites and the catalyst surface area despite the significant sintering of metal oxides. Consequently, the NOx-assisted soot oxidation activity of the catalyst was regenerated to some extent by the oxidation treatment. 展开更多
关键词 MnOx-CeO2-Al2O3 mixed oxides diesel soot sulfur dioxide thermal regeneration rare earths
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Effect of Fe_2O_3 Loading Amount on Catalytic Properties of Monolithic Fe_2O_3/Ce0.67Zr0.33O_2-Al_2O_3 Catalyst for Methane Combustion 认领 引用 被引量：4
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作者 刘志敏 陈耀强 +3 位作者 钟俊波 王健礼 闫生辉 龚茂初 《Journal of Rare Earths》 SCIE EI CAS 2007年第5期585-589,共5页
Ce0.67Zr0.33O2-Al2O3 solid solution was prepared by the co-precipitation method. Fe2O3-based catalysts supported on the solid solution were obtained by the impregnation method. The article revealed that the optimal lo... Ce0.67Zr0.33O2-Al2O3 solid solution was prepared by the co-precipitation method. Fe2O3-based catalysts supported on the solid solution were obtained by the impregnation method. The article revealed that the optimal loading amount of Fe2O3 on Ce0.67Zr0.33 O2-Al2O3 in our experimental condition for catalytic combustion of methane was 8% （ mass fraction）. The prepared catalysts were characterized by BET, TPR, XRD analyses, and their catalytic activity was investigated after being calcined at 873 K and after being aged in water gas at 1273 K. When the loading amount of Fe203 was 8% （ mass fraction）, the catalyst held the highest activity, and the best temperature speciality and thermal stability. The complete-conversion temperature of methane for fresh and aged sample was 788 and 838 K, respectively. The range between the light-off temperature and the complete-conversion temperature was only 15 K. The characterization results of XRD indicated that Fe2O3 was well dispersed on the Ce0.67Zr0.33O2-Al2O3 matrix. The results of BET and TPR were in good harmony with the catalytic activity results. 展开更多
关键词 Ce0.67Zr0.33O2 -Al2O3, Fe2O3-based monolithic catalyst catalytic methane combustion catalytic properties
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Selective catalytic reduction of NO with NH_3 over sol-gel-derived CuO-CeO_2-MnO_x/γ-Al_2O_3 catalysts 认领 引用 被引量：3
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作者 赵清森 向军 +3 位作者 孙路石 石金明 苏胜 胡松 《Journal of Central South University》 SCIE EI CAS 2009年第3期513-519,共7页
Granular CuO-CeO2-MnOx/γ-Al2O3 catalysts were synthesized by the sol-gel method. The performance of the CuO-CeO2-MnOx/γ-Al2O3 catalysts for the selective catalytic reduction (SCR) was studied in a fixed bed system. ... Granular CuO-CeO2-MnOx/γ-Al2O3 catalysts were synthesized by the sol-gel method. The performance of the CuO-CeO2-MnOx/γ-Al2O3 catalysts for the selective catalytic reduction (SCR) was studied in a fixed bed system. Preliminary tests were carried out to analyze the behavior of NH3 and NO over catalyst in the presence of oxygen. The optimum temperature range for SCR over the CuO-CeO2-MnOx/γ-Al2O3 catalysts is 300-400 ℃ . The catalysts maintain nearly 100% NO conversion at 350 ℃. The NH3 oxidation experiments show that both NO and N2O are produced gradually with the increase of temperature. The catalysts in this experiment have a stronger oxidation property on NH3, which improves the denitrification activity at low temperature. The over-oxidation of NH3 at high temperature is the main cause leading to a decrease in the NO conversion. The NH3 and NO desorption experiments show that NH3 and NO can be adsorbed on CuO-CeO2-MnOx/γ-Al2O3 granular catalysts. The transient response of NH3 and NO indicates that the SCR reaction proceeds in accordance with the Eley-Rideal mechanism. The adsorbed NO has little influence on the denitrification activity in SCR process. 展开更多
关键词 sol-gel method CuO-CeO2-MnOx/γ-Al2O3 NH3 NO conversion selective catalytic reduction （SCR）
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用于染料废水CWPO处理的Fe_2O_3-CeO_2/γ-Al_2O_3催化剂的制备及活性 认领 引用 被引量：11
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作者 刘琰 孙德智 《化工学报》 EI 北大核心 2006年第10期2303-2308,共6页
采用分层浸渍法研制出负载型Fe2O3-CeO2/γ-Al2O3催化剂,并使用BET、XPS和XRF方法对其进行了表征.以偶氮染料模拟废水为目标降解物,考察了该催化剂在催化湿式过氧化氢氧化工艺(CWPO)中的催化活性.结果表明,对于500mg·L-1的甲基橙... 采用分层浸渍法研制出负载型Fe2O3-CeO2/γ-Al2O3催化剂,并使用BET、XPS和XRF方法对其进行了表征.以偶氮染料模拟废水为目标降解物,考察了该催化剂在催化湿式过氧化氢氧化工艺(CWPO)中的催化活性.结果表明,对于500mg·L-1的甲基橙模拟染料废水,在常温(25℃)和常压条件下,当催化剂Fe2O3-CeO2/γ-Al2O3和氧化剂H2O2的投加量分别为30g·L-1和330mg·L-1时,处理3h时的脱色率、COD去除率和TOC去除率分别可达88·77%、89·54%和81·44%,表明该催化剂在CWPO工艺中具有较高的催化活性. 展开更多
关键词 催化湿式过氧化氢氧化 常温常压 Fe2O3-CeO2/γ-Al2O3 偶氮染料 废水处理
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Steam effects over Pd/Ce0.67Zr0.33O_2-Al_2O_3 three-way catalyst 认领 引用 被引量：2
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作者 王建强 沈美庆 +3 位作者 王军 高继东 马杰 刘双喜 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第8期748-752,共5页
Ceria-zirconia-alumina （CZA） solid solution was prepared by sol-gel method in the present study. 0.5 wt.% Pd supported on CZA was prepared by incipient wetness impregnation. The steam effects for CO and C3H8 oxidati... Ceria-zirconia-alumina （CZA） solid solution was prepared by sol-gel method in the present study. 0.5 wt.% Pd supported on CZA was prepared by incipient wetness impregnation. The steam effects for CO and C3H8 oxidation, three-way catalytic activity and stoichiometric window property were studied. The light-off temperature of the CO oxidation reaction shifted to a lower temperature due to the water-gas shift （WGS） reactions. The oxidation of C3H8 was enhanced due to the steam reforming （SR） reactions. The steam promoted the C3H8 oxidation and NO reduction in three-way catalytic reaction. The amplitude of stoichiometric window was amplified by the addition of water to the feed stream. 展开更多
关键词 Pd/Ce0.67Zr0.33O2-Al2O3 three-way catalytic activity water-gas shift steam reforming stoichiometric window rare earths
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Effects of ZrO_2 on the Performance of CuO-ZnO-Al_2O_3/HZSM-5 Catalyst for Dimethyl Ether Synthesis from CO_2 Hydrogenation 认领 引用 被引量：14
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作者 Yanqiao Zhao Jixiang Chen Jiyan Zhang 《Journal of Natural Gas Chemistry》 2007年第4期389-392,共4页
A series of composite catalysts were prepared by the wet mixing method, and the mass ratio of CuO-ZnO-Al2O3-ZrO2 component to HZSM-5 zeolite （molar ratio of SiO2 to Al2O3 being 25） was 2：1. The CuO-ZnO-Al2O3-ZrO2 ... A series of composite catalysts were prepared by the wet mixing method, and the mass ratio of CuO-ZnO-Al2O3-ZrO2 component to HZSM-5 zeolite （molar ratio of SiO2 to Al2O3 being 25） was 2：1. The CuO-ZnO-Al2O3-ZrO2 （CuO/ZnO/Al2O3=3/6/1 by weight） component was prepared by a modified ＇two-step＇ co-precipitation method. The effects of ZrO2 on the performance of CuO-ZnO-Al2O3/HZSMo5 catalyst for dimethyl ether synthesis from CO2 hydrogenation were investigated. It was found that ZrO2 improved the properties of CuO-ZnO-Al2O3/HZSM-5 as a structural promoter. 展开更多
关键词 CuO-ZnO-Al2O3/HZSM-5 catalyst CO2 hydrogenation dimethyl ether zirconia
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Autothermal reforming of methane over Ni catalysts supported over ZrO2-CeO2-Al2O3 认领 引用 被引量：6
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作者 Xiulan Cai Yuanxing Cai Weiming Lin 《Journal of Natural Gas Chemistry》 2008年第2期201-207,共7页
Ni catalysts supported on Al2O3, ZrO2-Al2O3, CeO2-Al2O3 and ZrO2-CeO2-Al2O3 were prepared by coprecipitation method, and their catalytic performances for autothermal reforming of methane to hydrogen were investigated.... Ni catalysts supported on Al2O3, ZrO2-Al2O3, CeO2-Al2O3 and ZrO2-CeO2-Al2O3 were prepared by coprecipitation method, and their catalytic performances for autothermal reforming of methane to hydrogen were investigated. The Ni-supported catalysts were characterized by XRD, TPR and XPS. The relationship between the structures and catalytic activities of the catalysts was discussed. The results showed that the catalytic activity and stability of the Ni/ZrO2-CeO2-Al2O3 catalyst was better than those of other catalysts with the highest CH4 conversion, H2/CO and H2/COx ratio at 750 ℃. The catalyst showed a little deactivation along the reaction time during its 72 h on stream with the mean deactivation rate of 0.08%/h. The catalytic performance of the Ni/ZrO2-CeO2-Al2O3 catalyst was also affected by reaction temperature, no2 ： nCH4 molar ratio and nH2O ： nCH4 molar ratio. TPR, XRD and XPS measurements indicated that the formation of ZrO2-CeO2 solid solution could improve the dispersion of NiO, and inhibit the formation of NiAl2O3, and thus significantly promoted the catalytic activity of the Ni/ZrO2-CeO2-Al2O3 catalyst. 展开更多
关键词 methane autothermal reforming hydrogen Ni/ZrO2-CeO2-Al2O3
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Cross metathesis of butene-2 and ethene to propene overMo/MCM-22-Al_2O_3 catalysts with different Al_2O_3 contents 认领 引用 被引量：3
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作者 Shenglin Liu Xiujie Li +4 位作者 Wenjie Xin Sujuan Xie Peng Zeng Lixin Zhang Longya Xu 《Journal of Natural Gas Chemistry》 2010年第5期482-486,共5页
A series of 3.0Mo/MCM-22-Al2O3 catalysts with γ-Al2O3 contents in the range of 0-100 wt% were prepared and applied in the metathesis reaction of ethene and butene-2. Addition of γ-Al2O3did not affect the structure o... A series of 3.0Mo/MCM-22-Al2O3 catalysts with γ-Al2O3 contents in the range of 0-100 wt% were prepared and applied in the metathesis reaction of ethene and butene-2. Addition of γ-Al2O3did not affect the structure of MCM-22 zeolite as evidenced by XRD and N2 adsorption measurements. It was deduced from TPR experiments that γ-Al2O3 phase favored the formation of polymolybdate or multilayered Mo oxide, while more Al2（MoO4）3 species were generated over MCM-22 zeolites. Alumina content in the support was directly related to the metathesis activity of ethene and butene-2 to propene. Mo species with higher valence （Mo6＋or Mo5＋） contributed more to the excellent performance of catalyst than metallic Mo. The best catalyst activity and stability was obtained over 3.0Mo/（MCM-22-30%Al2O3） under the reaction condition of 1.0 MPa and 125℃ using N2 as the pretreatment gas. 展开更多
关键词 butene-2 ethene propene metathesis Mo MCM-22-Al2O3
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A comparative study on different regeneration processes of Pt-Sn/γ-Al2O3 catalysts for propane dehydrogenation 认领 引用 被引量：10
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作者 Changyong Sun Junyin Luo +6 位作者 Mingjin Cao Ping Zheng Guocheng Li Jiahao Bu Zhou Cao Shihong Chen Xiaowei Xie 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2018年第1期311-318,共8页
Three different regeneration processes including hydrogen or nitrogen purging and coke-burning treatment were used to restore the Pt-Sn/γ-AlOcatalysts, through which propane dehydrogenation reaction was performed in ... Three different regeneration processes including hydrogen or nitrogen purging and coke-burning treatment were used to restore the Pt-Sn/γ-AlOcatalysts, through which propane dehydrogenation reaction was performed in a consecutive reaction-regeneration mode. It was found that the catalyst using hydrogen regeneration showed the best stability compared with those regenerated by nitrogen purging and coke-burning treatment, suggesting that hydrogen regeneration is an effective approach for maintaining the performance of Pt-Sn/γ-AlOcatalysts in propane dehydrogenation reaction. The effect of different regeneration atmospheres on the metal active center and the coke deposition was investigated by XRD,TEM, N-physisorption, TPO, TG and Raman technologies, and the results revealed that hydrogen or nitrogen regeneration resulted in little impact on the size and structure of metal active center, retaining the effective Pt Sn phase over the catalyst. Moreover, hydrogen regeneration not only removed the low dense components of the coke, but also altered the property of the residual coke through hydrogenation, leading to a higher mobility of coke, and thus a higher accessibility of the metal active centers. Whereas nitrogen regeneration only removed the low dense components of the coke. Although coke-burning regeneration caused a thorough coke removal, the catalyst subjected to repeated redox exhibited poor stability due to metal agglomeration, phase segregation and the resulting large PtSn particle and core-shell structure with a Sn-rich surface. 展开更多
关键词 Platinum-tin Pt-Sn/γ -Al2O3 Propane dehydrogenation Regeneration processesCoke
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现代表征技术在研究多相催化剂Fe2O3-CeO2/γ-Al2O3的结构和CO氧化反应性能中的应用 认领 引用 被引量：1
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作者 孙敬方 仝庆 +1 位作者 杨煜 董林 《应用化工》 CAS CSCD 北大核心 2020年第7期1866-1869,共4页
以Fe2O3-CeO2/γ-Al2O3催化剂为例,以机动车尾气催化消除中的CO氧化反应为模型反应,运用多种表征手段,考察制备方法调控下的催化剂结构及其对CO氧化反应性能的影响,探索催化作用本质。研究发现,制备方法会对Fe2O3-CeO2/γ-Al2O3催化剂... 以Fe2O3-CeO2/γ-Al2O3催化剂为例,以机动车尾气催化消除中的CO氧化反应为模型反应,运用多种表征手段,考察制备方法调控下的催化剂结构及其对CO氧化反应性能的影响,探索催化作用本质。研究发现,制备方法会对Fe2O3-CeO2/γ-Al2O3催化剂表面物种晶形、分散状态及配位环境等进行调控,共浸渍法制备的样品中具有更强的Fe-O-Ce相互作用,更多的团簇态活性Fe2O3物种,表现出更优的CO氧化性能。 展开更多
关键词 Fe2O3-CeO2/γ-Al2O3催化剂 现代表征技术 结构表征 CO氧化
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Growth of carbon nanotubes on the novel FeCo-Al_2O_3 catalyst prepared by ultrasonic coprecipitation 认领 引用 被引量：3
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作者 Jie Wen Wei Chu +1 位作者 Chengfa Jiang Dongge Tong 《Journal of Natural Gas Chemistry》 2010年第2期156-160,共5页
FeCo-Al2O3 catalyst was prepared by an ultrasonic coprecipitation （UC） method for the growth of carbon nanotubes （CNTs） from catalytic decomposition of methane.Its catalytic performance was compared with that of t... FeCo-Al2O3 catalyst was prepared by an ultrasonic coprecipitation （UC） method for the growth of carbon nanotubes （CNTs） from catalytic decomposition of methane.Its catalytic performance was compared with that of the FeCo-Al2O3 catalyst counterparts prepared by stepwise impregnation （I） and conventional coprecipitation （C） methods,respectively.The structure and properties of the catalysts and the CNTs as produced thereon were investigated by means of XRD,XPS,TEM and N2 adsorption techniques.It was found that the catalyst prepared by the ultrasonic coprecipitation method was more active,and the yield and purity of the synthesized CNTs were promoted evidently.The XPS results revealed that there were more active components on the surface of the catalyst prepared by the ultrasonic coprecipitation method.On the other hand,N2 adsorption demonstrated that the catalyst prepared by the ultrasonic coprecipitation method conferred larger specific surface area,which was beneficial to dispersion of active components.TEM images further confirmed its higher dispersion.These factors could be responsible for its higher activity for the growth of CNTs from catalytic decomposition of methane. 展开更多
关键词 carbon nanotubes ultrasonic coprecipitation FeCo-Al2O3 catalyst chemical vapor deposition （CVD）
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