共查询到19条相似文献,搜索用时 994 毫秒
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通过介绍SCG-1系列催化剂在茂名全密度聚乙烯装置中的应用历程,分析、对比SCG-1系列催化剂和进口催化剂在装置上的应用情况,包括催化剂的主要性能指标、催化剂在反应器中的表现,以及生产的产品种类和质量等,表明使用SCG-1系列催化剂,生产操作平稳,产品质量合格,各项性能指标等同或优于进口催化剂,已经在LLDPE装置上得到了大量的应用。 相似文献
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纳米金属氧化物催化剂在固体推进剂中的应用进展 总被引:1,自引:0,他引:1
综述纳米金属氧化物催化剂在固体推进剂中的应用现状,包括纳米过渡金属氧化物催化剂、纳米稀土金属氧化物催化剂和纳米复合金属氧化物催化剂,总结了目前应用中存在的问题。认为固体推进剂用纳米金属氧化物作催化剂,可获得优于非纳米催化剂的燃烧性能。 相似文献
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银催化剂因其优异的选择性、催化活性及热稳定性能在环氧乙烷工业中得到了广泛的应用。本文从银催化剂制备、银催化剂载体的发展两个方面概述银催化剂在乙烯环氧化反应中的应用,以期对银催化剂在乙烯环氧化反应中的应用有深入的了解。 相似文献
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茂金属催化剂的发展及应用 总被引:1,自引:0,他引:1
详细阐述了各种不同茂金属催化剂的结构、功能和特点,深入地探讨了茂金属催化剂的催化聚合作用机理及其在聚烯烃工业中的应用,论述了茂金属催化剂对聚合物加工性能、力学和物理性能以及共聚单体的影响,文中结尾综述了国外茂金属催化剂在聚烯烃合成中的应用现状。 相似文献
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二氧化碳和甲醇直接合成碳酸二甲酯研究进展 总被引:2,自引:1,他引:1
从均相及多相催化剂体系和反应条件等方面,综述了近年来二氧化碳和甲醇直接合成碳酸二甲酯的研究开发最新进展。介绍了均相催化剂体系包括有机金属烷氧基化合物、碱土金属烷氧基化合物、碱性催化剂和乙酸盐催化剂;多相催化剂体系包括负载型金属催化剂、负载型固体碱催化剂和氧化物催化剂。对催化剂及反应体系的设计、光催化剂、杂多酸催化剂、离子液体体系、助催化剂及吸水剂的使用、微波加热、膜反应器以及超临界二氧化碳溶剂体系进行了评述。 相似文献
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申桂英 《精细与专用化学品》2006,14(22):26-28
聚合反应的催化剂主要包括单活性点催化剂、齐格勒-纳塔催化剂和菲利浦催化剂。单活性点催化剂是具有增长潜力的品种,以其催化合成的聚合物产品的消费量在全球范围内都在增长。在西欧,70%~75%的聚乙烯生产装置采用齐格勒-纳塔催化剂生产,同时聚丙烯生产装置也主要是以该类催化剂生产,23%~25%的聚乙烯生产装置采用菲利浦催化剂生产。改进型齐格勒-纳塔催化剂可以比较容易地应用于现有生产工艺中,已在PP生产过程中占据稳固位置,预计今后的用量还会增长。 相似文献
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Alumina-silica binary mixed oxide used as support of catalysts for hydrotreating of Maya heavy crude
Alumina-silica binary mixed oxide support is used to prepare catalysts for hydrotreating of Maya heavy crude. Support is prepared by urea hydrolysis. Sequential incipient wetness and co-impregnation techniques are employed for preparation of catalysts. Ammonium heptamolybdenum is used as precursor of MoO3. Catalysts are characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR) and the pore size distribution. Hydrodemetallation (HDM), hydrodesulfurization (HDS), hydrodenitrogenation (HDN), and asphaltene conversion (HDAsp) reactions are studied on these catalysts. One reference catalyst is also taken for comparison. Coke and metals depositions on spent catalysts are measured. The catalyst deactivation rate is also studied. The X-ray diffraction (XRD) results reveal that molybdenum atoms are well dispersed into CoMo catalyst, whereas MoO3 crystalline phases are found in PCoMo and PNiMo catalysts. TPR reduction profiles are different for different catalysts. The laboratory made catalyst is reduced at one temperature, whereas the reference catalyst shows two reduction profiles. The reference catalyst shows the highest activities among four catalysts. The highest HDM and HDAsp activities of the reference catalyst may be due to its bigger pore diameter. The presence of TiO2 in the reference catalyst enhances HDS and HDN activities. The CoMo catalyst shows higher activities than those of PCoMo and PNiMo catalysts. The presence of crystalline MoO3 causes for lower activities of catalysts PCoMo and PNiMo. 相似文献
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本文综述了糠醛加氢制2-甲基呋喃所用的3类催化剂铬铜催化剂、无铬铜类催化剂、非晶态合金催化剂的近期研究进展。重点介绍了各类催化剂的制备及其催化性能,并对相关研究进行了评述。同时对糠醛加氢制备2-甲基呋喃催化剂的研究进行了展望。 相似文献
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Christopher W. Jones 《Topics in Catalysis》2010,53(13-14):942-952
Research on heterogenized metal complex catalysts has been carried out for 40 years. Despite thousands of published catalysts, there are only two significant commercial processes that utilize supported metal complex catalysts. Most academic papers are simply “demonstration of concept” studies reporting myriad ways to support various metal complex catalysts. Too few papers focus on rigorous studies of reaction kinetics, catalyst recycle, catalyst stability and deactivation pathways. Here, preliminary stability and deactivation studies of supported enantioselective Co-salen epoxide ring-opening catalysts and enantioselective Ru-salen olefin cyclopropanation catalysts are summarized. Insights with regard to catalyst deactivation suggest methodologies for catalyst stabilization, allowing for more effective catalyst recycle and enhanced catalyst turnover. Further examples where supported metal complex catalysts are applied in commercial processes will require the field to shift focus from “demonstration of concept” studies to more detailed investigations of catalyst stability and recyclability. 相似文献
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阳极催化剂是影响直接甲醇燃料电池(DMFC)性能及成本的主要因素之一,从催化剂载体选择、复合催化剂的制备、非贵金属催化剂研究三方面综述了DMFC阳极催化剂国内外研究现状,并进行了简要分析,展望了其应用前景。 相似文献