Studies of Zeolite Catalysts of Control of Emissions: RedoxReactions and Cation Siting

这是一个过渡金属交换到沸石的研究 或转化为含硅的铝磷酸盐分子筛 （SAPO）作为氧化还原反应的催化剂。 沸石 研究包括富硅八面沸石和其他 大孔沸石如沸石L和沸石Ω。 的 反应动力学，如一氧化氮的还原 与一氧化碳或氨反应， 氧化物，和甲烷的部分氧化进行了检查。 重点放在如何协调环境的 这些材料中的过渡金属阳离子 它们的催化行为。 动力学测量是 结合同位素示踪剂的研究， 研究结果与光谱和量热相结合， 研究了阳离子与各种 吸附质分子 一个目标是确定 交换的阳离子及其与 沸石（或SAPO）基质、吸附气体等 共交换的金属阳离子。 使用的光谱技术 包括高场魔角核磁共振， 红外光谱（中范围和远范围），以及 穆斯堡尔谱 正在处理的问题具有相当大的根本性 重要性 此外，正在调查的系统可能具有 直接应用于各种部分氧化 工业环境，固定 甲烷、汽车排放控制和酸雨改善。 这是密尔沃基和麦迪逊之间的合作努力 威斯康星州的校园。

This is a study of transition metals exchanged into zeolites or into silicon-containing aluminophosphate molecular sieves (SAPOs) as catalysts for redox reactions. The zeolites studied include silicon-enriched faujasites and other large-pore zeolites such as zeolite L and zeolite omega. The kinetics of reactions such as the reduction of nitric oxide with carbon monoxide or ammonia, the decomposition of nitrous oxide, and the partial oxidation of methane are examined. Emphasis is placed on how the coordination environments of the transition-metal cations in these materials are related to their catalytic behavior. Kinetic measurements are combined with studies involving isotopic tracers, and these findings are coupled with spectroscopic and calorimetric studies of the interactions of the cations with various adsorbate molecules. A goal is to determine the sitings of exchanged cations and the natures of their interactions with the zeolite (or SAPO) matrix, adsorbed gases, and other coexchanged metal cations. Spectroscopic techniques used include high-field magic-angle nuclear magnetic resonance, infrared spectroscopy (both midrange and far range), and Moessbauer spectroscopy. The issues being addressed are of considerable fundamental importance. In addition the systems under investigation may have direct application in partial oxidation in a variety of industrial settings, fixation of methane, automotive emission control, and acid rain amelioration. This is a collaborative effort between the Milwaukee and Madison campuses of the University of Wisconsin.