Synthesis and characterization of hierarchical nanoporous HY zeolites from acid-activated kaolin

doi:10.1016/S1872-2067(15)60962-7

Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (11): 1846-1851.DOI: 10.1016/S1872-2067(15)60962-7

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Synthesis and characterization of hierarchical nanoporous HY zeolites from acid-activated kaolin

Peter Adeniyi Alaba^a, Yahaya Muhammad Sani^a,b, Wan Mohd Ashri Wan Daud^a

a Department of Chemical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;
b Department of Chemical Engineering, Ahmadu Bello University, 870001 Nigeria

Received:2015-05-01 Revised:2015-08-15 Online:2015-11-02 Published:2015-11-02

Abstract

Abstract:

Hierarchical nanoporous HY zeolites were synthesized from acid-activated kaolin. The hierarchical factor (HF) was maximized by varying the aging and crystallization time. This was achieved by maximizing the external surface area without greatly reducing the micropore volume. The resulting products were characterized using X-ray diffraction (XRD), X-ray fluorescence, N₂ adsorption, and NH₃ temperature-programmed desorption. The nanoporous HY zeolite with the highest HF was obtained by aging for 48 h and a crystallization time of 24 h. The acidity and crystallinity varied depending on the operating parameters. Incorporation of an appropriate amount of NaCl was also vital in maximizing the HF, crystallinity, and acidity. The sample crystallinities were determined by comparing their XRD peak intensities with those of a conventional Y zeolite. The results show that optimizing this process could lead to a widely acceptable commercial route for HY zeolite production.

Key words: HY zeolite, Kaolin, Hierarchical mesopore, Hierarchical factor, Relative crystallinity

Peter Adeniyi Alaba, Yahaya Muhammad Sani, Wan Mohd Ashri Wan Daud. Synthesis and characterization of hierarchical nanoporous HY zeolites from acid-activated kaolin[J]. Chinese Journal of Catalysis, 2015, 36(11): 1846-1851.

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Synthesis and characterization of hierarchical nanoporous HY zeolites from acid-activated kaolin

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