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

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

1.
a Department of Chemical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;

Corresponding author: Wan Mohd Ashri Wan Daud,
Received Date: 1 May 2015
Available Online: 15 August 2015

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.
- HY zeolite,
- Kaolin,
- Hierarchical mesopore,
- Hierarchical factor,
- Relative crystallinity
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沈阳化工大学材料科学与工程学院沈阳 110142