Synthesis and Metals-Modification of Cu-SSZ-13 Molecular Sieve and Its Catalytic Performance in MTO Reaction
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O643.36;TQ426.94

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    Abstract:

    Cu-SSZ-13 was in situ hydrothermally synthesized using a template of a low-cost copper amine complex (Cu-TEPA). The effects of two copper salts and n(Na2O):n(Al2O3) on the crystal phase and morphological were studied, the catalyzation of methanol to olefins(MTO) of Cu-SSZ-13 prepared with two copper salts and metal cation modified Cu-SSZ-13 was tested. The catalysts were characterized by XRF, XRD, SEM, BET and NH3-TPD. The results show that alkalinity has a great influence on the crystallinity of Cu-SSZ-13, if the alkalinity was excessively high or low, zeolite analcime as an impurity or pure phase would be produced; During the reaction of MTO, hydrogen transfer reaction of Cu-SSZ-13 prepared with cupric nitrate is intense, the propane selectivity reached 40% in the early stage of the reaction, far higher than the 19% of Cu-SSZ-13 prepared with cupric sulfate. Cu-SSZ-13 modified with Mn exhibits a stronger ability in resisting pore blockage deactivation, under the reaction condition of reaction temperature 440℃ and WHSV 5h-1, its lifetime extended from 30minutes to 65minutes.

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History
  • Received:June 29,2016
  • Revised:September 09,2016
  • Adopted:September 30,2016
  • Online: January 18,2017
  • Published:
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