Effect of Treatment with NaAlO2 Solution on the Surface Acid Properties of Zeolite β
Effect of Treatment with NaAlO2 Solution on the Surface Acid Properties of Zeolite β
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DOI：
10.1006/jcat.2001.3421
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发表时间：
2002
影响因子：
7.3
通讯作者：
Xie Zai-ku;Bao Jia-qing;Yang Yiqing;Chen Qing-ling;Zhang Chengfang
中科院分区：
文献类型：
--
作者：
Xie Zai-ku;Bao Jia-qing;Yang Yiqing;Chen Qing-ling;Zhang Chengfang
研究了用NaAlO2水溶液处理对β沸石表面酸性的影响，以此作为增加Bronsted和Lewis酸位数目的方法。用NaAlO2水溶液处理H-β样品，用X-射线衍射仪、NH3-TPD、吡啶-IR、29SiMAS核磁共振和27AlMAS核磁共振对样品进行了表征。经NaAlO2水溶液处理后的H-β分子筛的表面性质发生了变化：强酸中心和弱酸中心的数量增加，酸总量增加，B酸中心和Lewis酸中心增加。用NaAlO2水溶液处理β分子筛，可以通过Al(OH)4-−阴离子的类质同象取代而使Si(0Al)A位重新铝化。
The influence of treatment with an NaAlO2 aqueous solution of NaAlO2 on the surface acid properties of zeolite β was studied as a method to increase the number of both Bronsted and Lewis acid sites. The Hβ samples, prepared by treating with an aqueous solution of NaAlO2, were characterized by XRD, NH3-TPD, pyridine-IR, 29Si MAS NMR, and 27Al MAS NMR. The surface properties of the Hβ zeolite changed after treatment with the aqueous NaAlO2 solution: the number of strong and weak acid sites, the total amount of acid, and the Bronsted and Lewis acid sites increased. The treatment of zeolite β with an aqueous solution of NaAlO2 may realuminate an Si(0Al)A site by the isomorphous substitution of Al(OH)4− anions.