Ti-MOR钛硅分子筛催化甲乙酮氨氧化反应性能

Highly efficient synthesis of methyl ethyl ketone oxime through ammoximation over Ti-MOR catalyst

以TiCl4蒸气处理深度脱铝的丝光沸石,采用气固相同晶置换制备了含钛丝光沸石(Ti-MOR),并以H2O2作为氧化剂,考察了釜式反应器中Ti-MOR催化甲乙酮(MEK)与氨的液相氨氧化反应合成甲乙酮肟(MEKO)的性能,进而在连续淤浆床反应器中评价了Ti-MOR的稳定性和选择性.结果表明,在优化的反应条件下,Ti-MOR催化剂上MEK连续氨氧化反应的转化率和MEKO选择性分别达到95%和99%以上,优于传统的钛硅分子筛TS-1;同时,MEK转化率、MEKO选择性、催化剂耐积炭性以及稳定性等指标接近结构重排改性的Ti-MWW催化剂.

The liquid-phase ammoximation of methyl ethyl ketone（MEK） to methyl ethyl ketone oxime（MEKO） with ammonia and hydrogen peroxide was conducted over MOR-type titanosilicate（Ti-MOR）,which was prepared from highly dealuminated mordenite and TiCl4 vapor by a secondary method of gas-solid phase reaction.The effects of reaction parameters on this reaction were studied systematically in a bath-type reactor.Based on the optimized reaction conditions,Ti-MOR was further employed as the catalyst for the ammoximation of MEK to MEKO in a continuous slurry reactor.This catalyst exhibited good catalytic activity and excellent MEKO selectivity in comparison to TS-1.Moreover,in terms of ketone conversion,oxime selectivity,coke resistance,and lifetime,Ti-MOR possessed the same advantages as the Ti-MWW catalyst prepared by structural rearrangement.