Affordable Access

Publisher Website

A study of the surface properties and steam reforming catalytic activity of nickel powders impregnated byn-alkanethiols

Authors
Journal
Journal of Power Sources
0378-7753
Publisher
Elsevier
Publication Date
Volume
162
Issue
1
Identifiers
DOI: 10.1016/j.jpowsour.2006.06.078
Keywords
  • Steam Reforming
  • Unsupported Ni Catalyst
  • N-Alkanethiols
  • Contamination
  • Ch4
  • Aromatic Carbon

Abstract

Abstract The surface properties and catalytic activity of nickel powders impregnated with n-alkanethiols (H–(CH 2) n –SH, n = 4, 5, 6, and 10) for the steam reforming of methane have been studied. The quantity and state of carbon and sulfur on fresh and used thiol-contaminated Ni catalysts were determined using XPS. The high catalytic activity and stability of Ni–C 4S and Ni–C 5S catalysts were similar to those of pristine Ni catalysts. However, the activity of Ni–C 6S catalysts decreased for temperatures above ∼580 °C and no activity was obtained over the Ni–C 10S at any temperature. Catalytic deactivation was principally caused by high surface coverages of aromatic carbon. The surface aromatic-carbon was due to the pyrolysis of the pre-adsorbed n-alkanethiols and not from the feed-gas methane. The aromatic carbon leads to the deactivation of the catalyst for the steam reforming of methane at coverages above ∼4.6%.

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