GOALI: Highly Dispersed Supported Bimetallic Catalysts: Preparation, Structure, and Performance

摘要CTS-9529455是加州大学戴维斯分校和福特汽车公司的合作研究成果。这是一种新型的负载型金属催化剂，由贵金属(铂或钯)与氧化物载体(氧化镁、氧化铝或二氧化硅)通过与亲氧金属(铬、钼或钨)的强相互作用结合而成。其目的是在小于一纳米的团簇中保持高分散性。催化剂是由贵金属和亲氧金属相互键合的有机金属簇合物制备的。对负载型双金属结构进行了结构表征，并用于催化正己烷脱氢环化、3-甲基-2-丁烯醛加氢和选择性一氧化氮还原等一系列反应。一个实用的目标是建立这些催化剂相对于温度和反应气体组成的稳定性极限，并最终为负载型双金属催化剂的合理设计奠定基础。双金属催化剂用于许多要求非常苛刻的工业和环境应用，包括液体燃料生产、合成气体转化和汽车尾气控制。这一努力为具有更好选择性和更长寿命的新一代催化剂奠定了基础。

ABSTRACT CTS-9529455 This is a cooperative research effort between the University of California at Davis and the Ford Motor Company. It is an investigation of a new class of supported metal catalyst consisting of a noble metal (platinum or palladium) bonded to an oxide support (magnesia, alumina, or silica) by means of a strong interaction with an oxophilic metal (chromium, molybdenum, or tungsten). The intent is to maintain high dispersion in clusters smaller than one nanometer. The catalysts are prepared from organmetallic clusters in which the noble and oxophilic metals are bonded to each other. The supported bimetallic structures are characterized structurally and used to catalyze a series of test reactions including n-hexane dehydrocyclization, 3-methyl-2-butenal hydrogenation, and selective nitric oxide reduction. A practical goal is the establishment of stability limits for these catalysts with respect to temperature and composition of the reactant gas stream, and to ultimately lay down a foundation for the rational design of supported bimetallic catalysts. Bimetallic catalysts are used in a number of very demanding industrial and environmental applications including liquid fuels production, synthesis gas conversion, and automotive exhaust control. This effort lays the groundwork for a new generation of catalysts with better selectivity and longer life.