期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 274, 期 -, 页码 1-8出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2018.07.012
关键词
n-decane hydroisomerization; Bifunctional catalyst; ZSM-22 zeolite; Dynamic crystallization; Pd metal sites
类别
资金
- National Natural Science Foundation of China [21676074, 21706053]
- Application Technology Research and Development Foundation of Harbin [2016AE4AE003, 2016RAXXJ014]
- Open Foundation of Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education
Two series of pure nanosized ZSM-22 zeolites (Z-22 (xD) and Z-22 (xS)) with different SiO2/Al2O3 molar ratios are synthesized with 1,6-diaminohexane (DAH) template by the hydrothermal method under dynamic and static crystallization conditions, respectively. The effects of crystallization conditions on the characteristic properties of ZSM-22 zeolites are investigated by XRD, SEM, HR-TEM, N-2 adsorption, Si-29 and Al-27 MAS NMR, NH3-TPD, Py-IR and H-2 chemisorption measurements. The results show that Z-22 (xS) samples reveal smaller crystal size, larger mesoporosity, weaker Bronsted acid strength and lower Bronsted acid density compared with Z-22 (xS) samples. The Pd/Z-22 (xD) and Pd/Z-22 (xS) bifunctional catalysts are prepared by loading 0.5 wt% Pd on the corresponding zeolite samples, respectively, and the catalytic performance over all bifunctional catalysts is tested in the hydroisomerization of n-decane. The catalytic test results indicate that the Pd/Z-22 (xD) catalysts show higher selectivity for both mono-branched and multi-branched iso-decanes than those of Pd/Z-22 (xS) catalysts, because of the smaller crystal size and lower Bronsted acidity. Therefore, the dynamic hydrothermal crystallization is an effective way to synthesize ZSM-22 zeolites with improved catalytic behaviors for the n-alkane hydroisomerization.
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