Controlled direct synthesis of single- to multiple-layer MWW zeolite  

作　　者：Jie-Qiong Chen Yu-Zhao Li Qing-Qing Hao Huiyong Chen Zhao-Tie Liu Chengyi Dai Jianbo Zhang Xiaoxun Ma Zhong-Wen Liu 

机构地区：[1]School of Chemical Engineering,Northwest University,Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy,International Science&Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources,Xi'an 710069,China [2]Key Laboratory of Syngas Conversion of Shaanxi Province,School of Chemistry&Chemical Engineering,Shaanxi Normal University,Xi'an 710119,China

出　　处：《National Science Review》2021年第7期162-169,共8页国家科学评论（英文版）

基　　金：by the National Natural Science Foundation of China(29178233 and 21536009);the China Postdoctoral Science Foundation(2016M600810 and 2017T100767);the Scientific Research Program of Shaanxi Provincial Education Department(19JC039).

摘　　要：The minimized diffusion limitation and completely exposed strong acid sites of the ultrathin zeolites make it an industrially important catalyst especially for converting bulky molecules.However,the structure-controlled and large-scale synthesis of the material is still a challenge.In this work,the direct synthesis of the single-layer MWW zeolite was demonstrated by using hexamethyleneimine and amphiphilic organosilane as structure-directing agents.Characterization results confirmed the formation of the single-layer MWW zeolite with high crystallinity and excellent thermal/hydrothermal stability.The formation mechanism was rigorously revealed as the balanced rates between the nucleation/growth of the MWW nanocrystals and the incorporation of the organosilane into the MWW unit cell,which is further supported by the formation of MWW nanosheets with tunable thickness via simply changing synthesis conditions.The commercially available reagents,well-controlled structure and the high catalytic stability for the alkylation of benzene with 1-dodecene make it an industrially important catalyst.

关 键 词：MWW 2D zeolite zeolite nanosheets amphiphilic organosilane ALKYLATION 

分 类 号：TQ426[化学工程]