Aiming to improve the catalytic performance of HZSM-5 in the catalytic conversion of coal-oil co-refining oil, a range of zeolite catalysts (HZ5-xD) were prepared by adjusting the recrystallization times of dissolution–recrystallization of HZSM-5 basing on the Oswald ripening mechanism. The results show that HZ5-xD processes more easily accessible active sites and mixed microporous-mesoporous structures. Larger pore size and moderate acidity were beneficial for the generation of benzene, toluene, ethylbenzene and xylene (BTEX). The selectivity and yield of reached as high as 29.76 % and 236.83 mg·g−1 over HZ5-2D at 700 °C, respectively. Both HZSM-5 and HZ5-xD demonstrate high selectivity to C3 gaseous hydrocarbons, likely due to the obedience of the carbenium ion mechanism. HZ5-2D still demonstrated more excellent catalytic performance than HZSM-5 after five regenerations. Collectively, these finding illustrates the broad application potential of Oswald ripening in special morphologies of zeolite to improve the conversion efficiency of coal tar to BTEX.

中文翻译：

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Oswald 熟化设计合成具有蛋黄壳结构的 ZSM-5 分子筛用于煤油共炼油芳构化


为提高HZSM-5在煤油共炼油催化转化中的催化性能，基于Oswald成熟机理，通过调整HZSM-5溶解-再结晶的再结晶时间，制备了一系列沸石催化剂（HZ5-xD）。结果表明，HZ5-xD 处理更容易接近的活性位点和混合微孔-介孔结构。较大的孔径和适度的酸度有利于苯、甲苯、乙苯和二甲苯 （BTEX） 的生成。在 700 °C 时，其选择性和产率分别高于 HZ5-2D 的 29.76 % 和 236.83 mg·g−1。HZSM-5 和 HZ5-xD 均对 C3 气态烃表现出高选择性，这可能是由于服从碳根离子机制。HZ5-2D 在五次再生后仍表现出比 HZSM-5 更优异的催化性能。总的来说，这些发现说明了 Oswald 成熟在沸石特殊形态中的广泛应用潜力，以提高煤焦油到 BTEX 的转化效率。