Effects of different mordenite (MOR) zeolite synthesis conditions, such as salt additive, hydrothermal time, hydrothermal temperature, and ultrasonic assistance, on dimethyl ether (DME) carbonylation were studied systematically in this work. Salt as additives being introduced into hydrothermal system obviously promoted the crystallinity and morphology of MOR. With the increase of hydrothermal time and temperature, a better crystallinity was obtained on the sample. However, a higher hydrothermal temperature of 180 °C led to a slightly decreased crystallinity. The MOR catalyst with NaCl as the additive and hydrothermal treatment at 130 °C for 48 h realized a better DME carbonylation activity with 50% DME conversion and almost 100% methyl acetate (MA) selectivity. In addition, H-MOR-UT, a MOR zeolite prepared with the assistance of ultrasonic treatment, showed a special morphology consisting of lots of MOR nanosheets with a width of around 70 nm. Here, this H-MOR-UT realized an enhanced catalytic stability and the highest DME conversion of 70%, about 5 times higher than the reference MOR zeolite prepared by traditional method. The strikingly excellent catalytic performance was attributed to its more acid content, stronger acid strength and smaller grain size.

本文系统研究了不同的丝光沸石合成条件，如盐添加剂，水热时间，水热温度和超声辅助条件对二甲醚（DME）羰基化的影响。将盐作为添加剂引入水热体系中明显促进了MOR的结晶和形貌。随着水热时间和温度的增加，样品获得了更好的结晶度。但是，较高的180°C水热温度导致结晶度略有降低。以NaCl为添加剂的MOR催化剂在130°C的温度下进行48 h的水热处理，实现了较好的DME羰基化活性，DME转化率为50％，乙酸甲酯（MA）的选择性几乎为100％。此外，H-MOR-UT，借助超声波处理制备的MOR沸石显示出一种特殊的形态，该形态由许多宽度约为70 nm的MOR纳米片组成。在这里，这种H-MOR-UT实现了增强的催化稳定性和最高70％的DME转化率，比传统方法制备的参比MOR沸石高约5倍。出色的催化性能归因于其更高的酸含量，更强的酸强度和更小的晶粒尺寸。