4.7 Article

Effect of Framework Si/Al Ratios on the Catalytic Performance of Isobutane Alkylation over LaFAU Zeolites

期刊

ENERGY & FUELS
卷 34, 期 8, 页码 9426-9435

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.0c01388

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资金

  1. National Key Research and Development Program of China [2017YFA0206803]
  2. National Natural Science Foundation of China [21878315]
  3. K. C. Wong Education Foundation [GJTD-2018-04]
  4. Major Program of National Natural Science Foundation of China [21890762]

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To develop catalysts with superior stability for isobutane alkylation, La3+ exchanged FAU zeolites with varying framework Si/Al ratios were investigated. Based on the reaction performed in a continuous flow stirred tank reactor, a strong linear relationship between catalyst lifetime and strong Bronsted acid concentration was observed. Catalyst lifetime was speculated to change in an M-shaped pattern with respect to the framework Si/Al ratio, which implies there were at least two extreme Si/Al ratios in terms of catalyst stability. However, their product distribution differed significantly. LaFAU with a high Si/Al ratio led to enhanced acid strength, which resulted in higher cracking, self-alkylation activity, and poor product selectivity. In determining a balance between catalyst stability and product selectivity, a Si/Al ratio of similar to 1.2 was selected as the optimal value for LaFAU zeolites.

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