Investigation of the Physical, Chemical, and Catalytic Properties of Transition Metal Cations in Zeolites

摘要-贝尔9713143教授。Alexis T. Bell和Jeffrey A. Reimer将研究过渡金属阳离子交换沸石的催化、结构和稳定性。测试反应将包括N2O分解和烯烃二聚化。物理化学探针将包括TPD、红外、拉曼、核磁共振、ESR和紫外可见光谱，包括非原位和原位，以确定反应前后的阳离子分布和氧化状态，以及反应过程中吸附和反应中间体的特性。其他技术，如XRD和SEM的微观结构，和郭天平的磁化率，也将被使用。利用双共振、谱线展宽和魔角自旋核磁共振技术来探测交换阳离子的分布和电子性质。分子筛结构、Si/Al比、共交换阳离子、阳离子负载、合成和反应条件对催化、结构和稳定性的影响将被确定。特别是，该研究将涉及使用Si/Al比超过10的商业ZMS-5，与Cu， Co, Ag, Ga， In和Zn等阳离子交换。研究过渡金属阳离子交换沸石的合成-结构-性能-性能关系，为过渡金属阳离子交换沸石的设计和工业应用提供依据。这类催化剂在石油、散化、精细化工、环保等行业具有重要的应用价值。

Abstract - Bell - 9713143 Profs. Alexis T. Bell and Jeffrey A. Reimer will study the catalytic, structural and stability properties of transition-metal cation-exchanged zeolites. Test reactions will include N2O decomposition and olefin dimerization. The physico-chemical probes will involve TPD, and infrared, Raman, NMR, ESR, and UV-Vis spectroscopy, both ex situ and in situ, in order to determine cation distribution and oxidation state before and after reaction, and adsorbed and reactive intermediates identity during reaction. Other techniques such as XRD and SEM for microstructure, and Guoy balance for magnetic susceptibility, will also be used. Double resonance, line broadening, and magic-angle spinning NMR techniques will be exploited to probe the distribution and electronic properties of exchanged cations. The influence of zeolite structure, Si/Al ratio, co-exchanged cations, cation loading, and synthesis and reaction conditions, on catalytic, structural, and stability properties will be determined. In particular, the study will involve the use of commercial ZMS-5 with Si/Al ratios above 10, cation-exchanged with, e.g., Cu, Co, Ag, Ga, In, and Zn. The synthesis-structure-property-performance relations will be studied to provide a basis for the design and industrial application of transition-metal cation-exchanged zeolites. This type of catalysts is of relevance in the petroleum, bulk chemical, fine chemical and environmental protection industries.