Influence of different templates on the acidity of ZSM-22 zeolite and its catalytic performance for hydroisomerization of <em>n</em>-decane

ZHANG Rui; WANG Yu; WU Wei; WANG Wen-jing; XIAO Lin-fei; WU Guang

Volume 40 Issue 11

Nov. 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(11): 1353-1358

ZHANG Rui, WANG Yu, WU Wei, WANG Wen-jing, XIAO Lin-fei, WU Guang. Influence of different templates on the acidity of ZSM-22 zeolite and its catalytic performance for hydroisomerization of n-decane[J]. Journal of Fuel Chemistry and Technology, 2012, 40(11): 1353-1358.

Citation:

ZHANG Rui, WANG Yu, WU Wei, WANG Wen-jing, XIAO Lin-fei, WU Guang. Influence of different templates on the acidity of ZSM-22 zeolite and its catalytic performance for hydroisomerization of n-decane[J]. Journal of Fuel Chemistry and Technology, 2012, 40(11): 1353-1358.

Citation:

ZHANG Rui, WANG Yu, WU Wei, WANG Wen-jing, XIAO Lin-fei, WU Guang. Influence of different templates on the acidity of ZSM-22 zeolite and its catalytic performance for hydroisomerization of n-decane[J]. Journal of Fuel Chemistry and Technology, 2012, 40(11): 1353-1358.

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Influence of different templates on the acidity of ZSM-22 zeolite and its catalytic performance for hydroisomerization of n-decane

Key Laboratory of Chemical Engineering Process & Technology for High-Efficiency Conversion, College of Heilongjiang Province, School of Chemistry and Material Sciences, Heilongjiang University, Harbin 150080, China

Received Date: 2012-02-09
Rev Recd Date: 2012-05-09
Publish Date: 2012-11-30

Abstract

Abstract

ZSM-22 zeolites with different SiO₂/Al₂O₃ ratio were synthesized under static conditions by using 1,6-diaminohexane and 1-ethylpyridinium bromide as template, respectively.The structure and acidic properties were characterized by X-ray diffraction (XRD), X Ray Fluorescence (XRF), N₂ adsorption, Scanning electron microscopy (SEM), ammonia temperature-programmed desorption (NH₃-TPD) and FT-IR spectroscopy of pyridine adsorbed (Py-IR). The 0.5%Pd/ZSM-22 bifunctional catalysts were prepared, and the dispersions of metal Pd over bifunctional catalysts were characterized by H₂ chemical adsorption, and their catalytic performance for hydroisomerization of n-decane were investigated in the fixed reactor. The results showed that different templates have great influence on the structure and acidity of ZSM-22 zeolites. ZSM-22 zeolite synthesized with 1,6-diaminohexane as template has smaller crystallite size, and isomerization product has shorter spread distance within the molecular sieve channel. It also has high B acid/L acid ratio, medium acidity, and synergetic effect between metal site and acid site. The conversion and isomerization selectivity of n-decane were high over the bifunctional catalysts Pd/ZSM-22.
- ZSM-22 zeolite,
- 1,6-diaminohexane,
- 1-ethylpyridinium bromide,
- bifunctional catalysts,
- hydroisomerization

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References

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