丙烯是化学工业中的大宗化学品和基本有机化工原料。丙烷脱氢是制丙烯的一条经济、可行、有效的路线。近年来该技术成为倍受全球石油化工界关注的焦点。本项目从丙烷在Pt-Sn催化剂上脱氢反应的机理出发，设计该催化剂的结构模型，并基于金属有机表面化学原理，提出新的Pt-Sn合金催化剂的合成方法。此合成方法以Pt-Sn催化剂的定向构筑为目标，期望在分子甚至原子尺度上控制催化剂的结构，实现Pt-Sn合金粒径大小、微观结构、组份分布等关键参数的精确调变。合成的Pt-Sn催化剂有高的分散度，以纳米簇（1 nm以下）分散在载体表面；同时Sn原子主要落位在合金粒子的表面隔离Pt活性位。该合成路线具有高度的可控性，能够合成整体性能（活性、选择性和稳定性）高的Pt-Sn催化剂，为丙烷脱氢新一代催化剂的开发提供思路和可能性。

Propylene is a commodity chemical and basic material in the chemical industry. Propane dehydrogenation is an economical, feasible and effective route for the production of propylene. This technology has recently attracted lots of attention in the field of petrochemical industry. A new kind of Pt-Sn catalyst for propane dehydrogenation is rationally designed based on the reaction mechanism, and then controlled synthesized from a Surface Organometallic Chemistry approach. This approach aims at constructing the structure of Pt-Sn alloy at molecular and atomic levels, in order to tune its composition, micro-structure and particle size precisely. Pt-Sn particles are small clusters below 1 nm, and highly dispersed at surface of support. The Sn species is located at the surface of particle which segregates Pt active sites. A high controllability of this approach enables to develop efficient Pt-Sn catalysts showing good activity, selectivity and stability in propane dehydrogenation, which provides fundamental knowledge and technology solution for the development of new generation of catalyst for propane dehydrogenation.