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Effects of concentration on the alkali-treatment of ZSM-5 zeolite: a study on dividing points

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Abstract

Alkali-treatment for modification or dissolution has attracted extensive attention as an innovative means of preparing porous materials. The hierarchical porosity of modified zeolite is highly dependent on its treatment conditions. However, studies on critical alkali-treatment concentrations, specifically those that discuss the dividing points, have not yet been reported. In this article, the pore and crystalline properties of ZSM-5 zeolite samples modified by different concentrations of alkali-treatment are investigated. The experimental results show that the pore properties of the samples change as a function of the alkaline concentration. The total surface, mesopore surface area, total pore volume, mesopore volume, and average pore diameter of ZSM-5 zeolites increase and then decrease with increasing alkaline concentrations. The micropore surface area, micropore volume, and crystallinity of the samples decrease monotonously. The following dividing points are proposed: 0.40 mol/L as the threshold for alkali-modification and 1.00 mol/L as the starting point for alkali-dissolution. A possible desilication mechanism is also proposed.

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Acknowledgments

The authors acknowledge the supports by the National Natural Science Foundation of China (Grant Nos. 20725620 and 20906102).

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Authors and Affiliations

  1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, 102249, Beijing, China

    Liang Zhao, Chunming Xu, Shan Gao & Baojian Shen

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  1. Liang Zhao
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  2. Chunming Xu
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  3. Shan Gao
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  4. Baojian Shen
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Correspondence to Baojian Shen.

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Zhao, L., Xu, C., Gao, S. et al. Effects of concentration on the alkali-treatment of ZSM-5 zeolite: a study on dividing points. J Mater Sci 45, 5406–5411 (2010). https://doi.org/10.1007/s10853-010-4593-2

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