钼负载量对FCC干气和混合C4组合进料制丙烯催化剂反应性能的影响

基于提高烯烃利用率和增产丙烯的目的,在C4烯烃裂解制丙烯工艺中,将FCC干气和混合C4按一定比例混合后作为进料.采用初湿浸渍法向ZSM-5分子筛催化剂中引入MoO3,以实现裂解反应与歧化反应的耦合.采用X射线衍射技术(XRD)、Py-FTIR光谱及BET技术对MoO3/ZSM-5-Al2O3催化剂进行表征.结果表明,钼...

INFLUENCE OF MoO3 CONTENT ON THE CATALYTIC PERFORMANCE OF CATALYST FOR PREPARING PROPENE FROM COMBINED FEED OF FCC DRY GAS AND MIXED C4

In order to enhance the utilization of olefins and to produce more propene,FCC dry gas was introduced as partial feed in the process of preparing propene from mixed C₄.A series of ZSM-5 zeolite catalysts loaded with various MoO₃ contents were prepared by incipient wetness procedure to realize the coupling of cracking reactions and metathesis reactions.The MoO₃/ZSM-5/Al₂O₃ catalysts were characterized by XRD,Py-FTIR and BET method to study the effect of MoO₃ content on the catalyst performance.Test results showed that the acidity,surface property and pore structure of the catalyst were affected by the loading of MoO₃.Based on correlating the evaluation results of fixed bed microreactor and the MoO₃ contents,it was found that under the conditions of a reaction temperature of 450℃,a dry gas/mixed C₄ volume ratio of 4 and a GHSV of 120 min^-1,MoO₃/ZSM-5/Al₂O₃ catalyst with suitable MoO₃ content was in favor of promoting metathesis reactions between ethene and 2-butene,and thus the propene yield was increased.A maximum propene yield of 27.85%was obtained over a catalyst with a MoO₃ content of 4%.