Template free synthesis of hierarchical porous zeolite Beta with natural kaolin clay as alumina source
Template free synthesis of hierarchical porous zeolite Beta with natural kaolin clay as alumina source
复制标题
以天然高岭土为氧化铝源的无模板合成分级多孔β沸石
DOI：
10.1016/j.micromeso.2019.109772
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发表时间：
2020-02-01
影响因子：
5.2
通讯作者：
Bao, Xiaojun
中科院分区：
文献类型：
--
作者：
Yue, Yuanyuan;Guo, Xiaoxue;Bao, Xiaojun
研究了以天然层状铝硅酸盐矿物高岭土为原料合成β分子筛的无模板合成路线。详细研究了β沸石的结晶过程，确定了最佳合成条件，并通过XRD、IR、SEM、TEM、BET、NH3-TPD、Py-IR和NMR等技术对合成的β沸石进行了全面研究。表征结果表明，该分子筛结晶度好，具有双峰孔结构，比表面积大，孔体积大，酸位浓度高，水热稳定性好等特点。分级β沸石对乙酸与苯甲醇酯化反应的催化性能得到了改善，其高活性和选择性主要归功于介孔的存在，加速了反应物和产物的颗粒内扩散速率。这种新颖的合成方法为制备分级沸石提供了一种低成本、环保的方法，为分级沸石的规模化生产提供了可持续的平台。
A template free synthesis route was developed for the synthesis of hierarchical zeolite Beta from a natural layered aluminosilicate mineral kaolin. Detailed study on the crystallization of zeolite Beta established the optimized synthesis condition, and the synthesized hierarchical Beta zeolite was fully studied by XRD, IR, SEM, TEM, BET, NH3-TPD, Py-IR and NMR techniques. The characterization results reveal that the hierarchical Beta zeolite possesses good crystallinity, bimodal pore architecture, large surface area, big pore volume, high acid site concentration and excellent hydrothermal stability. An improved catalytic performance was achieved in hierarchical Beta zeolite for the esterification of acetic acid with benzyl alcohol, and the high activity and selectivity in this zeolite are mainly attributed to the presence of mesopores for accelerating the intraparticle diffusion rate of both reactant and product. This novel synthesis methodology provides a low-cost and environmentally-benign way for the preparation of hierarchical Beta zeolite, which could serve a sustainable platform of large-scale production of hierarchical zeolite for practical application.