首页|Facile synthesis of hierarchical NaX zeolite from natural kaolinite for efficient Knoevenagel condensation

Facile synthesis of hierarchical NaX zeolite from natural kaolinite for efficient Knoevenagel condensation

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Zeolite catalysts have found extensive applications in the synthesis of various fine chemicals.However,the micropores of zeolites impose diffusion limitations on bulky molecules,greatly reducing the catalytic efficiency.Herein,we explore an economic and environmentally friendly method for synthesizing hier-archical NaX zeolite that exhibits improved catalytic performance in the Knoevenagel condensation reac-tion for producing the useful fine chemical 2-cyano-3-phenylacrylate.The synthesis was achieved via a low-temperature activation of kaolinite and subsequent in-situ transformation strategy without any tem-plate or seed.Systematic characterizations reveal that the synthesized NaX zeolite has both inter-crystalline and intra-crystalline mesopores,smaller crystal size,and larger external specific surface area compared to commercial NaX zeolite.Detailed mechanism investigations show that the inter-crystalline mesopores are generated by stacking smaller crystals formed from in-situ crystallization of the depoly-merized kaolinite,and the intra-crystalline mesopores are inherited from the pores in the depolymerized kaolinite.This synthesis strategy provides an energy-saving and effective way to construct hierarchical zeolites,which may gain wide applications in fine chemical manufacturing.

Hierarchical NaX zeoliteTemplate-free synthesisNatural kaoliniteKnoevenagel condensation

Wen Xiao、Peng Dong、Chan Wang、Jingdong Xu、Tiesen Li、Haibo Zhu、Tinghai Wang、Renwei Xu、Yuanyuan Yue

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National Engineering Research Center of Chemical Fertilizer Catalyst,College of Chemical Engineering,Fuzhou University,Fuzhou 350108,China

Qingyuan Innovation Laboratory,Quanzhou 362801,China

Sinochem Quanzhou Energy Technology Co.,Ltd.,Quanzhou 362000,China

国家自然科学基金国家自然科学基金国家自然科学基金福建省自然科学基金Sinochem Quanzhou Energy Technology Co.,LtdQingyuan Innovation Laboratory

2217805922208054220720192020J01513ZHQZKJ-19-F-ZS-007600121002

2024

10.1016/j.cjche.2023.07.007

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.65(1)
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