Isobutane and n-butane cracking on Ni-ZSM-5 catalyst: Effect on light olefin formation

被引:46
作者
Maia, A. J. [1 ]
Oliveira, B. G. [1 ]
Esteves, P. M. [1 ]
Louis, B. [2 ]
Lam, Y. L. [3 ]
Pereira, M. M. [1 ]
机构
[1] Univ Fed Rio de Janeiro, Ctr Tecnol, Inst Quim, BR-21941909 Rio De Janeiro, Brazil
[2] Inst Chim, UMR 7177, F-67070 Strasbourg, France
[3] Petrobras SA, Ctr Pesquisas & Desenvolvimento Leopoldo A Miguez, PDAB, Tecnol FCC, BR-21949900 Rio De Janeiro, Brazil
关键词
Nickel; ZSM-5; n-Butane; Isobutane; Ethylene; BRONSTED ACID SITES; HZSM-5; CATALYST; ZEOLITES; ACTIVATION; ISOMERIZATION; KINETICS; ALKANES; TRANSFORMATION; CONSEQUENCES; HYDROCARBONS;
D O I
10.1016/j.apcata.2011.06.014
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The catalytic activity of Ni-ZSM-5 zeolites was tested in the isobutane and n-butane cracking reaction. Nickel (0.4-6 wt%) was introduced into H-ZSM-5 zeolite by dry impregnation and ionic exchange methods. Both methods of nickel introduction led to a drastic improvement both in ethylene selectivity and isobutane cracking activity when compared to pristine H-ZSM-5 zeolite. In particular, the 1% (w/w) Ni-ZSM-5 catalyst increased the catalytic activity by two orders of magnitude with respect to parent H-ZSM-5. The comparison of Ni-ZSM-5 catalyst with mixtures of pure H-ZSM-5 and nickel supported on silica suggests that the dehydrogenation products formed at the nickel sites sequentially reacted on acidic sites. In addition the proximity between nickel and acid sites favors the reaction of the products formed previously on nickel sites onto zeolite acid site. These results support a true bifunctional catalysis behavior even though no reduction was performed before catalytic evaluation. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:58 / 64
页数:7
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