由酸活化高岭土制备多级纳米孔HY分子筛及其表征

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

催化学报 ›› 2015, Vol. 36 ›› Issue (11): 1846-1851.DOI: 10.1016/S1872-2067(15)60962-7

由酸活化高岭土制备多级纳米孔HY分子筛及其表征

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

a 马来西亚大学化学工程系, 吉隆坡50603, 马来西亚;
b 艾哈迈杜·贝罗大学化学工程系, 870001, 尼日利亚

收稿日期:2015-05-01 修回日期:2015-08-15 出版日期:2015-11-02 发布日期:2015-11-02
通讯作者: Wan Mohd Ashri Wan Daud. 电话: +60 3796 76897, +60 3796 75297; 传真: +60 3796 75319; 电子信箱: ashri@um.edu.my

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

摘要/Abstract

摘要：

由酸活化的高岭土制备了多级纳米孔HY分子筛. 通过改变老化时间和晶化时间可得到最大的多级因子(HF), 此时外比表面积最大而微孔孔体积变化不大. 运用X射线衍射(XRD)、X射线荧光光谱、N₂吸附-脱附法和NH₃程序升温脱附对所得样品进行了表征. 老化2 d和晶化24 h所制的纳米孔HY分子筛样品的HF值最大. 样品的酸性和结晶度也随着制备条件而变化. 另外, 适量NaCl的嵌入对提高对所制样品的HF值、酸性和结晶度起到重要作用. 通过比较样品和常规HY分子筛的XRD峰强度算得样品的结晶度. 结果表明, 优化合成条件可得到广泛适用于工业化的分子筛制备路线.

关键词: HY分子筛, 高岭土, 多级中孔, 多级因子, 相对结晶度

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. 由酸活化高岭土制备多级纳米孔HY分子筛及其表征[J]. 催化学报, 2015, 36(11): 1846-1851.

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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由酸活化高岭土制备多级纳米孔HY分子筛及其表征

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

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