Abstract
A 1%Ni/SBA-15(P) catalyst was synthesized with a P123-assisted impregnation method, which exhibited high CO2 conversion and stability in the reverse water-gas shift reaction. For the 1%Ni/SBA-15(P) catalyst, TEM and TPR characterizations demonstrated that the highly dispersed NiO particles at about 3 nm strongly interacted with the SiO2 support. During reverse water-gas shift reaction, the 1%Ni/SBA-15(P) catalyst exhibited higher CO2 conversion than the 1%Ni/SBA-15 catalyst prepared by the conventional impregnation method without P123. The CO2 conversion of the 1%Ni/SBA-15(P) catalyst at 700 °C was 33.7%, which was three times that of the 1%Ni/SBA-15 catalyst. Moreover, the former catalyst was stable at 700 °C within 1000 min. The good activity and stability of the 1%Ni/SBA-15(P) catalyst was owing to small Ni particles that strongly interacted with SBA-15.
Highlights
CO2 may be utilized through the dry reforming of methane [1,2,3] and reverse watergas shift reaction (RWGS) [4,5,6], which are promising models for CO production
The RWGS can produce CO from the greenhouse gas carbon dioxide and green hydrogen produced by renewable energy
Dispersed small Ni particles are favorable for RWGS, while large Ni particles generate methane [14]
Summary
CO2 may be utilized through the dry reforming of methane [1,2,3] and reverse watergas shift reaction (RWGS) [4,5,6], which are promising models for CO production. The RWGS can produce CO from the greenhouse gas carbon dioxide and green hydrogen produced by renewable energy. Nickelbased catalysts show good activity in RWGS [9,10,11,12]. The side reactions of CO2 methanation are prone to occur on nickel catalysts [10,12,13]. Dispersed small Ni particles are favorable for RWGS, while large Ni particles generate methane [14]
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