Role of support in CO{sub 2} reforming of CH{sub 4} to syngas over Ni catalysts
- State Univ. of New York, Amherst, NY (United States)
The dynamic changes in activity and selectivity for the CO{sub 2} reforming of CH{sub 4} over unsupported and supported Ni catalysts were investigated. The reduced NiO has low initial conversions of CH{sub 4} and CO{sub 2}, which decrease rapidly with time. The mixture of powders of NiO and Al{sub 2}O{sub 3} has low initial conversions of CH{sub 4} and CO{sub 2} and a low yield to CO, which however, increase with reaction time, due most likely to Ni migration to Al{sub 2}O{sub 3}. In contrast, the reduced 1 wt% Ni/Al{sub 2}O{sub 3} catalyst (reduced from NiO/Al{sub 2}O{sub 3}) has high initial conversions and CO yield, which slowly decrease with time due to carbon deposition. The reduced 13.6 wt% Ni/Al{sub 2}O{sub 3} catalyst has high initial conversions and CO yield, but, because of carbon deposition, the reactor was completely plugged in 6 h. The reduced 1 wt% Ni/SiO{sub 2} catalyst has moderate initial activity and CO yield, which decay fast with reaction time. The reduced 13.6 wt% Ni/SiO{sub 2} has a high initial activity and CO yield, which decay slowly with reaction time. The reduced 13.6 wt% Ni/TiO{sub 2} has a moderate initial activity and CO yield, which decay with reaction time. Carbon deposition was found to occur over all these catalysts, and the sequence of carbon deposition was: 13.6 wt% Ni/Al{sub 2}O{sub 3} > 13.6 wt% Ni/SiO{sub 2} > the reduced mixture of NiO and Al{sub 2}O{sub 3}(13.6 wt% Ni) > 13.6 wt% Ni/TiO{sub 2} > 1 wt% Ni/Al{sub 2}O{sub 3} > 1 wt% Ni/SiO{sub 2}. 31 refs., 10 figs., 1 tab.
- OSTI ID:
- 494274
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 162; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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