共查询到20条相似文献,搜索用时 640 毫秒
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综述了H2-TPR,TEM,XRD等物化方法在负载型金属催化剂的结构性能(包括金属分散度、表面结构、电子状态)方面的应用,为更好地认识和使用负载型金属催化剂提供了可靠的依据。 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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负载型金属催化剂因为其独特的催化性能在众多领域得到广泛应用。传统的催化剂制备方法有浸渍法,沉淀法,离子交换法和熔融法等。文章综述了溶剂化金属原子浸渍法,超临界技术和微波技术在负载型金属催化剂制备中的应用。 相似文献
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Heterogenization of homogeneous catalysts explores the cross-fertilization of homogeneous and heterogeneous catalysts to combine most of their advantages. The molecular dispersion of active sites in these materials limits the application of conventional spectroscopic techniques utilized for the characterization of heterogeneous catalysts. The X-ray absorption spectroscopy is the most suitable tool to characterize the molecular species present in these catalysts because this technique is sensitive to short-range structural orders, element-specific and amenable to in situ studies. X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) studies for selective examples of supported homogeneous catalysts are reviewed. Supported liquid phase catalysts (supported Wacker-type catalysts for CO oxidation), intercalated homogeneous catalysts, supported metal complexes for the olefin polymerization and tethered homogeneous catalysts are included. 相似文献
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Developments in catalyst technology for the dry reforming of hydrocarbon feedstocks are reviewed for methane, higher hydrocarbons and alcohols. Thermodynamics, mechanisms and the kinetics of dry reforming are also reviewed. The literature on Ni catalysts, bi-metallic Ni catalysts and the role of promoters on Ni catalysts is critically evaluated. The use of noble and transitional metal catalysts for dry reforming is discussed. The application of solid oxide and metal carbide catalysts to dry reforming is also evaluated. Finally, various mechanisms for catalyst deactivation are assessed. This review also examines the various process related issues associated with dry reforming such as its application and heat optimization. Novel approaches such as supercritical dry reforming and microwave assisted dry reforming are briefly expanded upon. 相似文献
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活化过硫酸盐高级氧化技术用于降解水体中有机污染物备受关注,其中采用过渡金属活化过硫酸盐降解有机污染物的研究越来越多,也取得了良好的效果。本文综述了近几年来国内外利用以过渡金属为基础的催化剂活化过硫酸盐降解污染物的应用研究;阐述了贵金属催化剂、单金属催化剂、复合金属催化剂(尖晶石结构催化剂、纳米核壳结构催化剂、三维纳米结构催化剂)在水体中降解有机污染物的研究进展;探讨了过渡金属催化剂的优缺点和研究现状,最后提出了该活化体系目前面临的问题,期望为过渡金属活化过硫酸盐降解污染物技术的应用提供参考。 相似文献
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