Preparation, Characterization and Catalytic Behavior of Alumina-Supported Platinym/Tin Reforming Catalysts and Related Model Systems

这是氧化铝负载的铂锡合金的基础研究 烃重整催化剂。 模型与真实的 研究了催化表面，包括镀铂氧化锡 薄膜、锡装饰铂晶体、铂/锡合金 表面，以及沉积在平面氧化铝上的铂和/或锡， 平面碳或多孔氧化铝。 各种表面分析 技术，包括X射线光电子 俄歇电子能谱（AES），离子 散射光谱（ISS），电子能量损失 光谱分析（EELS），二次离子质谱（西姆斯）， 电子刺激解吸（ESD）和紫外线 光电子能谱（UPS）。 催化重整 反应在低压和高压下进行， 反应器附加到超高真空表征 系统 催化行为与以下元素相关： 通过表征阐明的催化剂结构 问题研究 双金属重整催化剂，包括铂/锡 本课题所研究的系统， 能够生产更大量的高辛烷值燃料 原油质量等级不断下降。 他们还 在改善环境方面发挥着越来越重要的作用。 尽管它们具有巨大的经济重要性，但它们仍然很差。 明白 这些产品的产量和附加值 催化剂是这样的，即使是很小的改进， 经济效益//

This is a fundamental study of alumina-supported, platinum-tin bimetallic, hydrocarbon reforming catalysts. Model and real catalytic surfaces are studied, including platinized tin oxide films, tin-decorated platinum crystals, platinum/tin alloy surfaces, and platinum and/or tin deposited on planar alumina, planar carbon, or porous alumina. Various surface analytical techniques are used, including X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), ion scattering spectroscopy (ISS), electron energy loss spectroscopy (EELS), secondary-ion mass spectrometry (SIMS), electron-stimulated desorption (ESD), and ultraviolet photoelectron spectroscopy (UPS). Catalytic reforming reactions are run at both low and high pressures using a reactor attached to the ultrahigh-vacuum characterization system. Catalytic behavior is correlated with elements of catalyst structure as elucidated by the characterization studies. Bimetallic reforming catalysts, including the platinum/tin system studied in this project, are the principal technology enabling production of larger amounts of high-octane fuels from ever-decreasing quality grades of crude oil. They also have an increasing role in environmental amelioration. Despite their great economic importance, they are still poorly understood. The volumes and added value produced with these catalysts are such that even small improvements can have egret economic benefit. //