A novel hydrogen/syngas production process: Catalytic activity and stability of Ni/SiO2

M. Matsukata, T. Matsushita, K. Ueyama

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

A reformer using a circulating fluidized bed has been proposed for the production of hydrogen and syngas. A catalyst is circulated between two reactors for the catalytic decomposition of methane to hydrogen and carbon, and for the gasification of carbon deposited on the catalyst. Catalytic activities of Ni/SiO2 for both CH4 decomposition and CO2 gasification of deposited carbon were investigated at 873-1023 K in a periodically-operated fixed bed reactor. Carbon which had a moss-like morphology was hardly gasified and caused deactivation of the catalyst. Such a type of carbon became dominant with raising reaction temperature and with increasing amount of Ni loaded on SiO2. In contrast, filamentous carbon which had a graphitic structure could be gasified with CO2 and became dominant with decreasing amount of Ni loaded and with lowering reaction temperature. It was found that Ni(5 wt%)/SiO2 had a stable activity against the cycles of decomposition/gasification because Ni on Ni(5)/SiO2 was difficult to sinter at 873 K and as a result, the filamentous carbon was exclusively formed.

Original languageEnglish
Pages (from-to)2769-2774
Number of pages6
JournalChemical Engineering Science
Volume51
Issue number11
DOIs
Publication statusPublished - 1996 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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