The Zn-containing HMCM-22 samples with different zinc species were prepared and characterized to discriminate the influence of zinc species on the ethane activation by the initial C-H bond cleavage or the -H cleavage dehydrogenation step of alkyl zinc species (Zn-CH) through the propane co-dehydroaromatization and CO reduction process. The synergistic effect of zinc species types with the Brønsted acid sites (BAS) of the parent zeolite HMCM-22 had a significant effect on the ethane dehydroaromatization. The synergistic effect between ZnO species and BAS had better ethane conversion and aromatics selectivity in ethane dehydrogenation, while the poor synergistic effect between ZnOH species and BAS was not conducive to the formation of aromatics, and ZnOH species was more conducive to ethane dehydrogenation. The ZnOH has better catalytic performance in CO activated ethane and promote the -H desorption of Zn-CH in ethane dehydrogenation. The synergetic effect of ZnO species and BAS in the zeolite facilitates the hydride transfer activation of ethane by propylene carbenium ions thus enhancing the ethane conversion through ethane-propane co-aromatization.

中文翻译：

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MWW沸石中Zn物种对丙烷共脱氢芳构化和CO2还原辅助乙烷脱氢芳构化的影响

制备并表征了具有不同锌物种的含锌 HMCM-22 样品，以通过初始 CH 键断裂或烷基锌物种 (Zn-CH) 的 -H 断裂脱氢步骤来区分锌物种对乙烷活化的影响：丙烷共脱氢芳构化和CO还原过程。锌物质类型与母体沸石 HMCM-22 的布朗斯台德酸位点 (BAS) 的协同效应对乙烷脱氢芳构化具有显着影响。 ZnO物种与BAS之间的协同作用在乙烷脱氢中具有较好的乙烷转化率和芳烃选择性，而ZnOH物种与BAS之间的协同效应较差，不利于芳烃的形成，并且ZnOH物种更有利于乙烷脱氢。 ZnOH在CO活化乙烷中具有较好的催化性能，并促进乙烷脱氢中Zn-CH的-H脱附。沸石中ZnO物质和BAS的协同作用促进了丙烯碳正离子对乙烷的氢化物转移活化，从而通过乙烷-丙烷共芳构化提高了乙烷转化率。