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Catalysis Letters

, Volume 111, Issue 3–4, pp 213–219 | Cite as

SAPO-11/HBeta composites for catalytic cracking of 2-butylene: effects of defect structure

  • Xin Zhang
  • Jianwei Wang
  • Jin Zhong
  • Aisong Liu
  • Junkui Gao
Article
  • 113 Downloads

SAPO-11/HBeta composite was synthesized by using hydrothermal method (SB-H) and applied as catalyst for cracking of 2-butylene to C2–C3 olefins. SB-H sample exhibited comparatively high selectivity and high yield of C2–C3 olefins. XRD, IR, 27Al and 31P MAS NMR, Py-IR characterizations indicate that defect structure P(AlO4) n (n < 4) really existed in SB-H sample. SAPO-11 and HBeta chemically bonded and the defect P(AlO4) n (n < 4) formed during the hydrothermal synthesis of SB-H sample. P(AlO4) n (n < 4) unit caused new B acidic sites, which increased B acidic amount and B acidic distribution on SB-H sample. The improvement of B acidity decreased apparent active energy of cracking of 2-butylene to C2–C3 olefins on SB-H sample. Therefore, the high selectivity and high yield of C2–C3 olefins were obtained on SB-H sample in catalytic cracking of 2-butylene.

Keywords

SAPO-11 HBeta composite molecular sieve defect structure butylene catalytic cracking acidic property 

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Xin Zhang
    • 1
    • 2
  • Jianwei Wang
    • 1
  • Jin Zhong
    • 1
  • Aisong Liu
    • 1
  • Junkui Gao
    • 1
  1. 1.Research Institute of Petroleum ProcessingBeijingP. R. China
  2. 2.Institute fur Experimtalphysik, Fachbereich PhysikFreie Universitat BerlinBerlinGermany

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