摘要
分别考察了N2与H2O作为稀释气对ZSM-5分子筛催化甲醇制丙烯(MTP)反应的影响。比较了N2与H2O在不同稀释比下新鲜剂催化MTP反应的产物分布,阐述了N2气氛与H2O气氛的稀释机理;通过比较这2种气氛持续作用下,催化剂酸性及产物分布随时间的变化,进一步考察了水蒸气老化处理对催化剂性能的影响。结果表明,H2O的化学吸附致使分子筛脱不稳定铝的过程主要发生在MTP反应初期;由于H2O对不稳定铝具有快速脱除的作用,对新鲜剂进行24h的水蒸气老化处理,既削弱了H2O对催化剂酸性位的化学作用,又保留了相对稳定的骨架铝结构,同时还可降低MTP工艺的水/醇比,达到节水节能的效果。
The product distributions of methanol to propylene （MTP） reaction under different dilution ratios of H2O or N2 were investigated, in order to study the diluent effect on MTP over ZSM-5 zeolite. The different diluent mechanisms of N2 and H2O were presented. Based on the diluent mechanism of H2O, the acidity of catalyst and the product distribution of MTP reaction were investigated under the continuous effect of H2O. The results showed that the adsorption effect of H2O on the acidity of catalyst would cause the removal of extra-framework aluminum, which mainly happened during the initial period of MTP reaction. By hydrothermal aging of catalyst for 24 h, the relatively stable framework aluminum was retained, thus the chemical adsorption effect of H2O on the acid sites decreased, then the demand of water during the MTP reaction reduced, resulting in the water and energy savings.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2015年第2期556-562,共7页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家重点基础研究发展规划"863"项目(2012AA030304)基金资助
