This paper presents comparative data on the selectivity and gasoline fraction composition for commercial catalysts based on Zn- and Pd-modified zeolites with the same MFI structural type, but produced by different manufacturers. The data are obtained in the operation of a two-reactor micropilot unit in a flow circulation mode. The relationship and differences between the character and type of Brønsted acid site were investigated using in situ high-temperature diffuse reflectance IR spectroscopy during annealing of the catalysts in dry argon, hydrogen, and dimethyl ether flows. It was found that catalysts contain organic ammonium cations with different structures of organic substituents, which decompose to give a very strong nitrogen-containing acid site. This site can promote the formation of branched paraffins and light aromatics from dimethyl ether. Under the action of these sites, methanol can be rapidly converted to DME, which is more reactive towards the production of gasoline fraction.

本文介绍了具有相同MFI结构类型但由不同制造商生产的，基于Zn和Pd改性沸石的商业催化剂的选择性和汽油馏分组成的比较数据。该数据是在两反应器微导阀单元在流动循环模式下的操作中获得的。在干燥氩气，氢气和二甲醚流动的催化剂退火过程中，使用原位高温漫反射红外光谱研究了布朗斯台德酸位点特征与类型之间的关系和差异。发现催化剂包含具有不同有机取代基结构的有机铵阳离子，其分解产生非常强的含氮酸位。该位点可促进由二甲醚形成支链烷烃和轻质芳烃。在这些位点的作用下，甲醇可以迅速转化为二甲醚，对汽油馏分的生产更具反应性。