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...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 acidiW and crystallinity varied depending on the operating parameters. Incorporation of an appropriate amount of NaCI 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 FIY zeolite production.展开更多
基金funded by Fundamental Research Grant Scheme,University of Malaya through the project number of FP031-2013A
文摘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 acidiW and crystallinity varied depending on the operating parameters. Incorporation of an appropriate amount of NaCI 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 FIY zeolite production.
