Zeolite Encaged Transition Metal-Proton Adducts Catalytic, Selectivity and Dispersion Stability

小行星9221841 这是一个系统的研究，在沸石中的金属质子加合物，包括这些加合物在修改金属的催化特性和锚定金属簇的沸石中的作用。 解决的一个问题是，在含质子的沸石中的过渡金属的增强的催化活性是由于金属颗粒的缺电子还是由于加合质子在催化反应中的化学参与。 在这方面的努力的重点是铑簇，虽然钯和铂的额外工作也包括在内。 金属和金属-质子加合物上的烃转化反应的速率与通过光电子能谱测定的金属的缺电子进行比较。 使用的其他表征技术包括X射线吸收法（使用同步辐射）、电子显微镜、红外光谱、核磁共振、程序升温质谱法和同位素交换。 研究了醇类和胺类化合物对沸石中金属烧结的影响。 所研究的沸石包括Y、L和ZSM-5。 本文所研究的催化剂体系在石油精炼以及纤维和塑料工业用单体的生产中是重要的。 这里揭示的影响可能会极大地影响这些系统的性能或寿命。

9221841 Wolfgang Sachtler This is a systematic study of metal-proton adducts in zeolites, including the role of these adducts in modifying the catalytic characteristics of metal and in anchoring metal clusters to the zeolite. One issue addressed is whether the enhanced catalytic activity of transition metals in proton-containing zeolites is due to the electron deficiency of the metal particles or to the chemical participation of adduct protons in the catalytic reaction. The emphasis in this effort is on rhodium clusters although additional work on palladium and platinum is also included. The rates of hydrocarbon conversion reactions on metals and metal- proton adducts are compared with the electron deficiency of the metals as determined by photoelectron spectroscopy. Other characterization techniques used include X-ray absorption methods (using synchrotron radiation), electron microscopy, infrared spectroscopy, nuclear magnetic resonance, temperature-programmed mass spectrometric methods, and isotopic exchange. The effects of alcohols and amines on metal sintering in zeolites is also study. Zeolites studied include Y, L, and ZSM-5. The catalyst systems under study here are important in petroleum refining and in the production of monomers for the fiber and plastics industries. The effects uncovered here could dramatically influence the performance or lifetimes of these systems.