A sponge-like small pore zeolite with great accessibility to its micropores,Inorganic Chemistry Frontiers

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A sponge-like small pore zeolite with great accessibility to its micropores
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-04-02 , DOI: 10.1039/d0qi00261e
Kok-Giap Haw _{1,

2,

3,

4} , Simona Moldovan _{5,

6,

7,

8,

9} , Lingxue Tang _{1,

2,

3,

4} , Zhengxing Qin _{4,

10,

11,

12,

13} , Qianrong Fang _{1,

2,

3,

4} , Shilun Qiu _{1,

2,

3,

4} , Valentin Valtchev _{1,

2,

3,

4,

14}

Affiliation

Small pore zeolites, due to pore size constraint, have limited applications. Post-modification on the materials is therefore important to widen their use. A CHA-type zeolite (SSZ-13) with a unique sponge-like structure is obtained by fluoride leaching. The development of macroporosity started from the crystal surfaces and continued progressively into the crystal by prolonging the treatment. Nitrogen physisorption measurements showed an increase in micropore volume and specific surface area as a consequence of the dissolution of the low crystallinity part of the zeolite. The effect of etching on the accessibility through the pore network, evaluated by means of breakthrough experiments on CO₂/N₂ and CO₂/CH₄ binary mixtures, showed an improved accessibility thanks to the interconnected macropores which shorten the diffusion pathlength. The set of experimental data shows the sponge-like SSZ-13 crystals retaining the intrinsic zeolitic properties but having an improved accessibility and crystallinity.

中文翻译：

海绵状小孔沸石，易于进入微孔

由于孔径的限制，小孔沸石的应用受到限制。因此，对材料进行后期修改对于扩大其用途很重要。通过氟化物浸出获得具有独特的海绵状结构的CHA型沸石（SSZ-13）。大孔的形成从晶体表面开始，并且通过延长处理时间逐渐进入晶体。氮的物理吸附测量表明，由于沸石低结晶度部分的溶解，微孔体积和比表面积增加。通过对CO ₂ / N ₂和CO ₂ / CH ₄的穿透实验评估了蚀刻对通过孔网络的可达性的影响由于互连的大孔缩短了扩散路径的长度，二元混合物显示出更好的可及性。这组实验数据表明，海绵状SSZ-13晶体保留了固有的沸石特性，但具有更高的可达性和结晶度。

更新日期：2020-04-02

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