Preparation of core–shell-like zeolites by diffusion controlled chemical etching,Inorganic Chemistry Frontiers

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Preparation of core–shell-like zeolites by diffusion controlled chemical etching
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2021-2-19 , DOI: 10.1039/d0qi01417f
Yanfeng Shen _{1,

2,

3,

4,

5} , Mingrui Xu _{1,

2,

3,

4,

5} , jingyang Li _{1,

2,

3,

4,

5} , Zhengxing Qin _{1,

2,

3,

4,

5} , Chunzheng Wang _{1,

2,

3,

4,

5} , Svetlana Mintova _{1,

2,

3,

4,

5} , Xinmei Liu _{1,

2,

3,

4,

5}

Affiliation

The present work reports on the preparation of core–shell-like zeolites with a Si-rich mesoporous shell. This is achieved by diffusion controlled chemical etching of zeolite crystals with a mixture containing oxalic acid and ammonium fluoride (OA–NH₄F). The OA–NH₄F mixture served as a bifunctional etchant extracting both surface Si and Al and further dealuminating the periphery of the zeolite crystals. The fast dissolution kinetics and the relatively slow intra-crystalline diffusion of the OA–NH₄F etching solutions resulted in a distinct core–shell-like structure with a porous and Si-rich shell, preserving the unique advantages of single crystals with interconnected micro- and mesopores.

中文翻译：

通过扩散控制化学刻蚀制备核-壳状沸石

本工作报道了具有富硅介孔壳的核壳状沸石的制备。这是通过使用草酸和氟化铵（OA-NH ₄ F）的混合物对沸石晶体进行扩散控制化学蚀刻来实现的。OA-NH ₄ F混合物用作双功能蚀刻剂，可萃取表面Si和Al并进一步脱铝沸石晶体的外围。OA-NH ₄ F蚀刻溶液的快速溶解动力学和相对较慢的晶体内扩散导致了独特的核-壳状结构以及富含硅的多孔壳，保留了具有互连微结构的单晶的独特优势。 -和中孔。

更新日期：2021-03-08

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