98/02215 A carbonaceous thin film made by CVD and its application for a carbon/n-type silicon (C/n-Si) photovoltaic cell : Yu, H. A. et al. Carbon, 1998, 36, (1), 137–143

• Publisher: Elsevier Science
• Year: 1998
• Weight: 205 KB
• Volume: 39
• Category: Article
• ISSN: 0140-6701
• DOI: 10.1016/s0140-6701(98)80410-4

✦ Synopsis

A study into the effect of hydrogen sulfide on the steam reforming of methane. Methane is the most difficult component to convert by steam reforming in a mixture of hydrocarbons, which is produced in biomass gasification. Two catalysts were subjected to hydrogen sulfide levels up to 300 ppm so as to study the effect of sulfur on their deactivation. These catalysts were the Cll-9-061, from United Catalyst Inc., and the HTSRl, from Haldor Topsoe. The activation energy of the sulfur-deactivated steamreforming reaction was calculated to be 280 and 260 kJ/mol, for each catalyst, respectively. The high values most probably originate from the fact that the degree of coverage of the nickel surface is close to 1 for these experiments.

Even under these severe conditions, steam reforming of methane is possible without any carbon formation. The HTSRl catalyst exhibits a very high sulfur-free activity, resulting in a performance in the presence of hydrogen sulfide higher than that for the Cll-9-061 catalyst. By using the HTSRl catalyst, the reactor temperature can be lowered by 60°C in order to reach comparable levels of conversion.