CO2 adsorbs physically onto SiO2 but is activated on Ga2O3-promoted SiO2, resulting in surface carbonate and bicarbonate species. Consequently, the Ni/SiO2–Ga2O3 catalyst showed a higher stability and coke resistance for CO2 reforming of methane than the Ni/SiO2 catalyst.
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Pan et al. (2010) studied this question.
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