烃类晶格氧选择氧化

用催化剂的晶格氧作为烃类选择氧化的氧化剂, 按还原-氧化(Redox) 模式,采用循环流化床提升管反应器, 将烃原料和空气分开进料, 在提升管反应器中烃分子与催化剂的晶格氧反应生成氧化产物, 失去晶格氧的催化剂被输送到再生器中用空气氧化到初始高价态, 然后送入提升管反应器完成还原-再氧化循环。这种新工艺是在没有气相氧分子的条件下进行反应, 可避免气相和减少表面的深度氧化反应, 大幅度提高烃类选择氧化的选择性, 而且因不受爆炸极限的限制可提高原料浓度, 使反应产物容易分离回收, 是控制深度氧化、节约资源和保护环境的有效催化新技术。本文试图对晶格氧选择氧化的研究现状, 面临的主要挑战和应用前景进行简要评述。

Selective Oxidation of Hydrocarbons Using Lattice Oxygen of Catalyst as Oxidant

A ccording to the redox mode, the selective oxidation of hydrocarbons using lattice oxygen as oxidant could be implemented in the following manner: a riser reactor for oxidation of hydrocarbon with lattice oxygen to form product, a regenerator for reoxidation of catalyst by air to restore its initial state. There are several advan tages in the separation of redox process comparing with cofeed mode: (1) A high selectivity of product could be obtained, because nonselective oxidation could be inhibited in the absence of gas phase oxygen; (2) A highly concentrated hydrocarbon feed stream could be used due to no trouble with explosion limit, that results in a simpler separation of the products and the recovery of unconverted hydrocarbon feed for recycle. This new technology is very useful for selective oxidation of hydrocarbons to save raw materials, improve environment and enhance economic benefit. In this paper, the current research and advances, the facing challenges, and the potential applications of the selective oxidation of hydrocarbons with lattice oxygen are briefly reviewed.