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Citation: ZENG Peng-hui, ZHANG Li-li, GUO Xiao-zhong, LI Ming-fu, GUO Qiao-xia, NIU Chao, SHEN Bao-jian. Catalytic performances of Al-ITQ-13 zeolites with different SiO2/Al2O3 ratios in the conversion of methanol to propene[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(11): 1349-1355. shu

Catalytic performances of Al-ITQ-13 zeolites with different SiO2/Al2O3 ratios in the conversion of methanol to propene

  • State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, College of Sciences, China University of Petroleum(Beijing), Beijing 102249, China

  • Corresponding author: SHEN Bao-jian, baojian@cup.edu.cn
  • Received Date: 3 May 2017
    Revised Date: 13 June 2017

    Fund Project: the National Natural Science Foundation of China U1462202The project was supported by the National Natural Science Foundation of China (U1462202), the Science Foundation of China University of Petroleum-Beijing (2462015YQ0309)the Science Foundation of China University of Petroleum-Beijing 2462015YQ0309

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  • Al-ITQ-13 zeolites with different SiO2/Al2O3 molar ratios were synthesized by using seeds in the gel and characterized by XRD, SEM, N2 physisorption, MAS NMR and NH3-TPD. The effect of SiO2/Al2O3 molar ratio on the catalytic performance of Al-ITQ-13 in the conversion of methanol to propene (MTP) was investigated in a fixed-bed micro-reactor. The results showed that the Al-ITQ-13 zeolites with different SiO2/Al2O3 molar ratios are similar in their textural properties; however, the amount and strength of acid sites decrease with the increase of SiO2/Al2O3 molar ratio. Moreover, the SiO2/Al2O3 molar ratio has a significant influence on the catalytic behavior of Al-ITQ-13 in MTP. As the hydrogen transfer and aromatization reactions were suppressed over the Al-ITQ-13 zeolite with high SiO2/Al2O3 molar ratio, with the increase of SiO2/Al2O3 molar ratio, the selectivity to propene and butene is increased at the expense of the selectivity to propene; that is, with the increase of SiO2/Al2O3 molar ratio from 137 to 309, the selectivity to propene is increased from 46.04% to 55.52% and meanwhile, the propene/ethene ratio is increased from 3.39 to 6.57.
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