乙醇催化脱水制乙烯催化剂的制备与性能评价

采用混捏法制备乙醇脱水制乙烯EDE-104催化剂,并引入活性金属氧化物E对催化剂进行改性,通过正交实验得到较优的工艺条件:反应温度360℃,液体空速0.5 h-1,原料乙醇质量分数60%,并在此条件下进行了1 000 h的寿命实验。结果表明,乙醇催化脱水制乙烯催化剂中引入活性金属氧化物E,提高了乙烯选择性,增强了催化剂的稳定性,乙烯选择性97.5%,乙醇单程转化率97.5%,乙烯收率96%。

Preparation and performance evaluation of the catalyst for ethanol dehydration to ethylene

The catalyst for ethanol dehydration to ethylene was prepared by the kneading method and was modified by the addition of active metal oxide E to improve the selectivity to ethylene and the stability of the catalyst.The optimal process condition was obtained by orthogonal experiments as follows:reaction temperature 360 ℃,liquid space velocity 0.5 h^-1,and ethanol mass fraction 60%.The life span test for 1 000 h was carried out under the condition.The results indicated that the selectivity to ethylene and the stability of the catalyst were enhanced by adding active metal E to the catalyst,and the selectivity to ethylene,per pass conversion of ethanol,and ethanol yield were＞97.5%,＞97.5% and ＞96%,respectively.