Elucidation of the Influence of Ni-Co Catalytic Properties on Dry Methane Reforming Performance
Phongaksorn, M.
Tungkamani, S.
Dharmasaroja, N.
Sornchamni, T.
Chuvaree, R.
Kanjanabat, N.
Siri-Nguan, N.
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Phongaksorn M., Tungkamani S., Dharmasaroja N., Sornchamni T., Chuvaree R., Kanjanabat N., Siri-Nguan N., 2015, Elucidation of the Influence of Ni-Co Catalytic Properties on Dry Methane Reforming Performance, Chemical Engineering Transactions, 43, 925-930.
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Carbon deposition is a major problem of dry methane reforming (DMR) over Ni-based catalyst. Recently, Ni- Co bimetallic catalyst has shown the improvement of carbon resistance of Ni-based catalyst. The objective of this work is to study the influence of properties of Ni-Co catalysts on its DMR performance, as well as the influence of Ni-Co alloy formation in Ni-Co catalyst. In this work, Al-Mg mixed oxide (Al-Mg-O) was prepared by sol-gel method. Catalyst samples; 10 wt% Ni/Al-Mg-O (Ni/MA), 10 wt% Co/Al-Mg-O (Co/MA) and 5 wt% Ni- 5 wt% Co/Al-Mg-O (Ni-Co/MA), were prepared by incipient wetness impregnation method. All catalysts were characterized by H2-TPR, H2-TPD and TPH. The results indicate that Ni-Co/MA provides excellent reducibility with strong metal support interaction (SMSI) as compared with monometallic catalysts. The bimetallic catalyst also exhibits better metal dispersion. Ni-Co/MA shows highest performance of CO2 adsorption. TPH profiles of spent catalysts from CH4-decomposition and CO2-decomposition reveal that Ni-Co/MA can suppress coking from both decomposition reactions, whereas TPH profiles of Ni/MA and Co/MA show the hydrogenation of carbon deposition from CH4-decomposition and CO2-decomposition. DMR tests over catalyst samples were carried out at 620 °C under atmospheric pressure with the flow of CH4:CO2:N2 mixture after the reduction at 620 °C for 12 h. The H2/CO ratio of DMR over Ni-Co/MA is 0.94 which is close to stoichiometry ratio (unity) without the occurrence of carbon deposition. This result can be attributed to the high CO2 adsorption performance with excellent carbon resistance. The effect of Ni-Co alloy formation of Ni-Co/MA on DMR was investigated when Ni-Co/MA was reduced at higher temperature (800 °C). It was found that increasing in the degree of alloy formation between Ni-Co improves the selectivity of the catalyst which shows H2/CO ratio of almost unity.
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