Liu Yahua, Zhao Na, Xian Hui, Cheng Qingpeng, Tan Yisheng, Tsubaki Noritatsu, Li Xingang
§State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan, 030001, P.R. China.
⊥Department of Applied Chemistry, School of Engineering, University of Toyama, Gofuku 3190, Toyama city, Toyama 930-8555, Japan.
ACS Appl Mater Interfaces. 2015 Apr 29;7(16):8398-403. doi: 10.1021/acsami.5b01905. Epub 2015 Apr 20.
Hard coke blockage of micropores of acidic zeolites generally causes serious catalytic deactivation for many chemical processes. Herein, we report a facile method to synthesize H-mordenite nanosheet assemblies without using any template agent. The assemblies exhibit the high catalytic activity for carbonylation of dimethyl ether because of their large quantity of framework Brønsted acids. The specific morphology of the nanosheet unites improves mass diffusion for both reactants and products. Consequently, the coke precursor species can readily migrate from the micropores to the external surface of the assemblies, inducing the improved catalytic stability through inhibiting hard coke formation in frameworks.
酸性沸石微孔的硬焦炭堵塞通常会导致许多化学过程中严重的催化失活。在此，我们报道了一种无需使用任何模板剂即可合成H-丝光沸石纳米片组装体的简便方法。由于其大量的骨架布朗斯特酸，这些组装体对二甲醚羰基化表现出高催化活性。纳米片单元的特定形态改善了反应物和产物的质量扩散。因此，焦炭前驱体物种能够容易地从微孔迁移到组装体的外表面，通过抑制骨架中硬焦炭的形成来提高催化稳定性。
