Facile and Rapid Synthesis of Durable SSZ-13 Catalyst Using Choline Chloride Template for Methanol-to-Olefins Reaction
Facile and Rapid Synthesis of Durable SSZ-13 Catalyst Using Choline Chloride Template for Methanol-to-Olefins Reaction
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DOI：
10.3390/catal11101250
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发表时间：
2021-10
期刊：
影响因子：
3.9
通讯作者：
Xiongchao Lin;Sasha Yang;Xiaojiang Li;Caihong Wang;Yonggang Wang
中科院分区：
文献类型：
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作者：
Xiongchao Lin;Sasha Yang;Xiaojiang Li;Caihong Wang;Yonggang Wang
本研究提出了一种以氯化胆碱（CC）为模板快速合成SSZ-13催化剂的方法，并考察了其催化甲醇制烯烃（MTO）反应的性能。加入适量的CC(即m（CC)/m(SiO2)=0.14）后，在4 h内即可得到均匀分布的立方SSZ-13晶体，团聚率较低。合成的催化剂具有优异的多孔性，总比表面积和介孔体积分别为641.71 m2·g−1和0.04 cm3·g−1。通过调节m(CC)/m（SiO2）比，获得了SSZ-13上的最佳强酸位点和弱酸位点。在较低的反应温度（450℃）下，合成的催化剂中强酸位点较少，弱酸位点较多，有利于MTO反应的催化性能。合成的SSZ-13适宜的酸度和发育良好的孔隙结构也可以减缓碳沉积速率，从而显著提高催化剂的催化寿命。合成的催化剂对轻烯烃的甲醇转化率和初始选择性分别保持在95%和50%以上，寿命达到172 min。虽然合成的SSZ-13催化剂的低烯烃选择性略低于购买的催化剂，但其良好的特性被认为具有良好的工业应用潜力。
In the current study, a facile and rapid synthesis approach for a SSZ-13 catalyst using choline chloride (CC) as a template was proposed, and the catalytic performance for the methanol-to-olefins (MTO) reaction was examined. With a proper amount of CC addition (i.e., m(CC)/m(SiO2)=0.14), uniform and homogeneously distributed cubic SSZ-13 crystals were obtained within 4 h with lower aggregation. The synthesized catalyst demonstrated excellent porous features with a total specific surface area and mesopore volume of 641.71 m2·g−1 and 0.04 cm3·g−1, respectively. The optimized strong and weak acid sites on SSZ-13 were obtained by regulating the m(CC)/m(SiO2) ratio. The less strong acid sites and a larger amount of weak acid sites in the synthesized catalyst were conducive to the catalytic performance of the MTO reaction under a lower reaction temperature (450 °C). The appropriate acidity and well-developed pore structure of synthesized SSZ-13 could also slow down the carbon deposition rate and, thus, significantly improve the catalytic lifetime of the catalyst. The methanol conversion rate and initial selectivity of light olefin using the synthesized catalyst could maintain over 95% and 50%, respectively, and a lifetime of 172 min was achieved. Although the low olefin selectivity of the synthesized SSZ-13 catalyst was slightly lower than that of the purchased one, its desirable features were thought to have good potential for industrial application.