丙烯选择性氧化催化剂性能

摘要

通过分步沉淀法制备Mo-Bi-Co-Ni-Fe-K-O复合氧化物催化剂,考察了反应温度、空速和氧烯比等条件对丙烯氧化制备丙烯醛反应中催化性能的影响.结果表明,在反应温度(325～330)℃、空速(1 300～1 700)h-1和n(O2):n(C3H6)=1.5～1.7条件下,丙烯转化率98%,目的产物收率94%.经560 h运转考核,催化荆性能稳定.%Composite oxide catalyst Mo-Bi-Co-Fe-K-O was prepared by stepwise precipitation method and the effects of reaction temperature, space velocity and 02/C3 H6 molar ratio on properties of the catalyst for propylene oxidation to acrolein were investigated. The results showed that propylene conversion of 98％ and acrolein yield of 94％ were attained under the optimum condition as follows: reaction temperature (325 - 330) ℃, space velocity ( 1 300 - 1 700) h - 1, n ( O2 ): n ( C3 H6 ) = 1.5 - 1.7. The catalyst exhibited good stability after running for 560 h.