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High-efficiency nano [Zn,Al]ZSM-5 bifunctional catalysts for dimethyl ether conversion to isoparaffin-rich gasolineстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Xiaofang Su, Zhang Ke, Yuliya Snatenkova, Zareta Matieva, Xuefeng Bai, Nataliya Kolesnichenko, Wei Wu
- Журнал: Fuel Processing Technology
- Том: 198
- Год издания: 2020
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- DOI: 10.1016/j.fuproc.2019.106242
- Аннотация: The development of nonpetroleum routes for producing high-octane clean gasoline rich in isoparaffins is still an important challenge today. Here, nanosized ZSM-5 (NZ5) and zinc isomorphously substituted ZSM-5 ([Zn,Al]NZ5) zeolites with different Si/Me ratios in initial gels (Me=Al or Al and Zn) were prepared in situ by a seedinduced method and were used as high-efficiency catalysts in the reaction of dimethyl ether (DME) to gasoline (DTG). It was found that the formation of isoparaffins and aromatics are competitive processes. The long-chain olefin intermediates can be converted to aromatics by cyclization and hydrogen transfer on the Brønsted acid site (BAS), whereas they undergo the hydroisomerization to form isoparaffins on the hydrogenation species. Excellent catalytic activity and high isoparaffin selectivity were obtained for the [Zn,Al]NZ5 samples due to the reduced BAS and the unique ZnOH+ species with high ability for the heterolysis of hydrogen and hydrogenation activity under a syngas atmosphere. When the reaction atmosphere changes from syngas to H2, the isoparaffin selectivity in gasoline component over the [Zn,Al]NZ5(20) sample increased further, from 67.3 wt% to 76.5 wt%, which is superior to the NZ5 series of samples and to ever reported catalyst.
- Добавил в систему: Матиева Зарета Муратовна