制备了不同SiO₂/Al₂O₃摩尔比的丝光沸石分子筛(MOR),对其二甲醚羰基化反应活性进行了评价,并对反应后催化剂上的积炭进行了表征。结果表明,随着SiO₂/Al₂O₃摩尔比的提高,MOR催化剂上羰基化反应诱导期逐渐缩短,二甲醚(DME)转化率逐渐升高,但单程寿命并未随硅铝摩尔比提高而有较大改变。适当提高硅铝摩尔比有助于降低传质阻力、提高MOR催化剂的羰基化反应活性。反应后MOR催化剂上的积炭量整体与催化剂的反应活性呈正相关,即硅铝摩尔比提高后催化剂上的积炭量较多、积炭的氢碳比较低。

A series of mordenite (MOR) with different SiO₂/Al₂O₃ ratios are prepared,their activity in the carbonylation of dimethyl ether (DME) is evaluated,and the coke deposits formed on the catalyst during the reaction process are characterized.Test results indicate that with the increase of SiO₂/Al₂O₃ ratio,the induction period of the carbonylation reaction is gradually shortened and DME conversion increases gradually.However,the single-pass lifespan of catalyst does not change with the increase of SiO₂/Al₂O₃ ratio.Suitable increase of SiO₂/Al₂O₃ ratio is conducive to reduce resistance in mass transfer,and helps the catalyst to improve the carbonylation performance.The coke deposition amount on the MOR catalyst after the reaction is positively correlated with the reaction activity of the catalyst as a whole,i.e.,more coke deposition will be formed over the catalyst with higher SiO₂/Al₂O₃ ratio.

王晓胜(1988-),男,博士,讲师,研究方向为合成气高值利用,wxs880620@cup.edu.cn