Synthesis of Nanosized SAPO-34 via an Azeotrope Evaporation and Dry Gel Conversion Route and Its Catalytic Performance in Chloromethane Conversion,Industrial & Engineering Chemistry Research

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Synthesis of Nanosized SAPO-34 via an Azeotrope Evaporation and Dry Gel Conversion Route and Its Catalytic Performance in Chloromethane Conversion
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-01-02 00:00:00 , DOI: 10.1021/acs.iecr.7b03326
Jingwei Zheng ₁ , Dongliang Jin ₁ , Zhiting Liu _{1,

2} , Kake Zhu ₁ , Xinggui Zhou ₁ , Weikang Yuan ₁

Affiliation

Nanosized SAPO-34 has been successfully synthesized by a facile and low-cost method involving an azeotrope evaporation and steam-assisted crystallization route without either expensive poregens or homemade starting materials. The as-synthesized nanosized SAPO-34 shows ultrasmall grain sizes and an impressively high total pore volume, as confirmed by X-ray diffraction, nitrogen physisorption, scanning electron microscopy, and transmission electron microscopy techniques. The formation process and the pivotal role of supersaturation in the synthesis of nanosized SAPO-34 have been revealed by a series of control experiments, on the basis of which a nonclassic oriented attachment mechanism under high supersaturation ratio conditions is proposed. When used as the catalyst for the conversion of chloromethane to olefins, the nanosized SAPO-34 exhibits acidity comparable to that of the conventional SAPO-34 but double the catalytic lifetime and a slightly lower selectivity for light olefins.

中文翻译：

共沸物蒸发和干凝胶转化路线合成纳米级SAPO-34及其催化氯甲烷转化性能

纳米SAPO-34已通过一种简便且低成本的方法成功合成，该方法涉及共沸物蒸发和蒸汽辅助的结晶途径，而无需使用昂贵的孔原或自制原料。如X射线衍射，氮气物理吸附，扫描电子显微镜和透射电子显微镜技术所证实的那样，合成后的纳米级SAPO-34具有极小的晶粒尺寸和惊人的高总孔体积。通过一系列的控制实验，揭示了过饱和在纳米级SAPO-34合成中的形成过程和关键作用，在此基础上提出了在高过饱和比条件下非经典取向的附着机理。当用作将氯甲烷转化为烯烃的催化剂时，

更新日期：2018-01-03

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