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Acta Phys. -Chim. Sin.  2003, Vol. 19 Issue (03): 216-220    DOI: 10.3866/PKU.WHXB20030306
Article     
Skeletal Isomerization of Butene on Si, Zr-substituted Aluminum Phosphate Zeolites
Wang Zhe-Ming;Yan Zi-Feng
State Key Laboratory for Heavy Oil Processing, CNPC Key Laboratory of Catalysis, University of Petroleum, Dongying 257061
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Abstract  Si, Zr-substituted aluminumphosphate zeolites were synthesized by hydrothermal method. XRD data indicated that they bear the same AEL structure with APO-11 zeolite. Of interest is that the crystal shape of SAPO-11 and APO-11 all are sphere-like, while ZAPO-11 exists as bar-like. Simultaneously, the introduction of heteroatoms in APO-11 skeleton could lead to the positive modification of acidity and micropore features. SAPO-11 showed higher acidity and ZAPO-11 possessed less micropore volume. Of special is that SAPO-11 with Si/Al =0.15 is the optimum shape-selective catalyst of skeletal isomerization of butene. The isomerization effect factors, such as butene partial pressure, temperature, were also extensively investigated. Of special is that the inconsistency in concentration changes between product isobutene and by-product, C3 and C5, was continually occurred while the reaction parameters were accordingly changed. It indicated that isobutene is shape-selectively formed via mono-imolecule mechanism, while the by-products C3 and C5 are mainly formed via bimolecular mechanism.

Key wordsHeteroatomic substitution      Aluminumphosphate zeolites      Isomerization of butene      Mono-molecular mechanism      Dimolecular mechanism     
Received: 23 May 2002      Published: 15 March 2003
Corresponding Authors: Wang Zhe-Ming     E-mail: zfyancat@hdpu.edu.cn
Cite this article:

Wang Zhe-Ming;Yan Zi-Feng. Skeletal Isomerization of Butene on Si, Zr-substituted Aluminum Phosphate Zeolites. Acta Phys. -Chim. Sin., 2003, 19(03): 216-220.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20030306     OR     http://www.whxb.pku.edu.cn/Y2003/V19/I03/216

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