Affordable Access

Publisher Website

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

Authors
Journal
Applied Catalysis A General
0926-860X
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/j.apcata.2011.06.014
Keywords
  • Nickel
  • Zsm-5
  • N-Butane
  • Isobutane
  • Ethylene

Abstract

Abstract 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.

There are no comments yet on this publication. Be the first to share your thoughts.