Dimethyl ether to gasoline (DTG) process is an important way to obtain transportation fuels from non-petroleum routes due to the ever-decreasing fossil energy under “dual-carbon” background, and the development of catalyst with long lifetime remains an important challenge. Herein, the hierarchical nanocrystalline H[Fe,Al]ZSM-5 zeolites composed of loosely aggregated nanocrystals were prepared by adding a mesoporous template and prolonging the aging time, and their physicochemical properties and reactivity over the DTG reaction were investigated and compared with that of conventional H[Fe,Al]ZSM-5. The size of individual nanocrystals became smaller and more uniform, and the nanocrystals were loosely aggregated with abundant intercrystal mesopores, resulting in the significant enhancement of catalyst lifetime. Furthermore, the acid intensity of hierarchical nanocrystalline zeolites weakened, and the strong acid amount was reduced. DTG reaction results illustrated that the hierarchical nanocrystalline zeolite of Mes-ZSM-5 using a mesoporous template exhibited the longest lifetime (182 h) with 100% DME conversion, and gasoline yield remained more than 70%. Moreover, the C₅⁺ selectivity was up to 76.6%; meanwhile, the contents of aromatics, benzene and durene were as low as 40%, 0.6% and 1.7%, respectively. The obtained gasoline product had a higher RON (research octane numbers).

中文翻译：

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轻松合成分级纳米晶 H[Fe,Al]ZSM-5，延长 DTG 反应寿命


由于“双碳”背景下化石能源不断减少，二甲醚制汽油（DTG）工艺是从非石油路线获取运输燃料的重要途径，而开发长寿命催化剂仍然是一个重要挑战。本文通过添加介孔模板和延长老化时间，制备了由松散聚集的纳米晶组成的分级纳米晶H[Fe,Al]ZSM-5沸石，研究了其物理化学性质和DTG反应活性，并与普通沸石进行了比较。传统的H[Fe,Al]ZSM-5。单个纳米晶的尺寸变得更小、更均匀，纳米晶松散聚集，具有丰富的晶间介孔，导致催化剂寿命显着提高。此外，分级纳米晶沸石的酸强度减弱，强酸量减少。 DTG反应结果表明，采用介孔模板的Mes-ZSM-5分级纳米晶沸石表现出最长的寿命（182小时），DME转化率为100%，汽油产率保持在70%以上。而且C ₅ ⁺选择性高达76.6%；同时，芳烃、苯和杜烯的含量分别低至40%、0.6%和1.7%。所得汽油产品具有较高的RON（研究辛烷值）。