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协同效应对一步法合成二甲醚催化剂失活的影响
张海鹏,于英民,李青松
(中国石油大学重质油国家重点实验室,山东青岛 266580)
摘要:
一步法合成二甲醚由于催化剂间存在协同效应,原料转化率高。采用不同硅铝比的HZSM-5分子筛与XNC-98甲醇合成催化剂制备一步法合成二甲醚的复合催化剂,研究不同组成的复合催化剂间协同效应的差异及其对催化剂稳定性的影响,考察催化剂的不同制备方法及不同还原方法对协同效应及催化剂稳定性的影响。结果表明:硅铝比为40的分子筛与甲醇合成催化剂间的协同效应最强,催化剂活性高且稳定性更好;采取一定措施使甲醇合成催化剂与甲醇脱水催化剂之间接触得更紧密,制备的复合催化剂协同效应更强,催化剂的稳定性更好;还原时采用氢气含量较低的还原气,还原后甲醇合成催化剂的Cu晶粒更小,催化剂的活性与稳定性也更好。
关键词:  二甲醚  催化剂  协同效应  失活
DOI:10.3969/j.issn.1673-5005.2017.05.021
分类号::TQ 032.4
文献标识码:A
基金项目:重质油国家重点实验室自主研发重点项目(SLKZZ-2017002)
Influence of synergistic effect on deactivation of direct dimethyl ether synthesis catalyst
ZHANG Haipeng, YU Yingmin, LI Qingsong
(State Key Laboratory of Heavy Oil Processing in China University of Petroleum, Qingdao 266580, China)
Abstract:
As there is synergistic effect between the catalysts in the direct synthesis of dimethyl ether, the feedstock conversion is high. Multi-functional catalysts of direct dimethyl ether synthesis were prepared using HZSM-5 zeolite with different Si/Al molar ratio and XNC-98 methanol synthesis catalysts. The differences of synergistic effect on different compositions of synthesis catalysts and their effects on the stability of the catalysts were studied. Meanwhile, the influences of different preparation and reduction methods of catalysts on synergistic effect and stability of catalysts were also investigated. The results show that the synergistic effect between the zeolite with Si/Al molar ratio of 40 and methanol synthesis catalysts is the strongest, which presents higher activity and better stability. It is also found that close contact between methanol synthesis catalysts and methanol dehydration catalysts could result in stronger synergistic effect of composite catalysts were, and better stability of catalysts as well. The reducing gas with lower hydrogen was used in the process of reduction, which can obtain smaller Cu grain of the methanol synthesis catalysts after reduction. And the activity and stability of the catalyst are also better.
Key words:  dimethyl ether  catalyst  synergistic effect  deactivation
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