Transient Kinetics Study of Catalytic Char Gasification in Carbon Dioxide

Anthony A. Lizzio, Ljubisa R. Radovic

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Abstract

The deactivation behavior of K. Ca, and Ni catalysts during carbon (char) gasification in CO2 was investigated. Correlations were sought between gasification rates and reactive surface areas (RSA) of the chars. In addition, the results allowed some speculation on recently proposed mechanisms of catalysis. An excellent correlation was found in the case of K catalysis, suggesting the rate-determining step in the overall mechanism to be the same as in the uncatalyzed reaction, i.e., desorption of the reactive C(O) intermediate. For the Ca-catalyzed reaction, the quality of the correlation depended on catalyst dispersion, suggesting that an additional process, besides the direct decomposition of the reactive C(O) intermediate, contributed to the transient evolution of CO (e.g., oxygen spillover). No correlation was found for Ni-catalyzed gasification; an oxygen-transfer mechanism is proposed to explain these findings. Mixed catalyst systems (Ca/K, K/Ni, Ca/Ni) were also studied. An excellent correlation between reactivity and RSA was observed in cases where the K-catalyzed reaction was dominant.

Original languageEnglish (US)
Pages (from-to)1735-1744
Number of pages10
JournalIndustrial and Engineering Chemistry Research
Volume30
Issue number8
DOIs
StatePublished - Aug 1 1991

All Science Journal Classification (ASJC) codes

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

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