Study on Catalytic Performance of Mo2C Catalysts Supported on Different Carbon Carriers for Reverse Water Gas Shift(RWGS)Reaction
Carbon nanoballs,carbon nanofibers and graphene nanosheets were used as carbon sources,and ammonium heptamolybdate,nickel nitrate,and copper nitrate were used as raw materials,the catalysts of 30%supported Mo2C/carbon nanoballs(Mo2C/A),Mo2C/carbon nanofibers(Mo2C/B),Mo2C/graphene(Mo2C/C),and 1%Ni-Mo2C/carbon nanoballs(Ni-Mo2C/A),1%Cu-Mo2C/carbon nanoballs(Cu-Mo2C/A)were prepared by a saturated impregnation process and temperature-controlled carbonization method.The fresh catalyst was characterized by XRD,CO-TPD and SEM,and the catalytic performance of the catalyst was investigated.The experimental results indicated that Mo2C/A exhibited a higher CO2 conversion rate compared to Mo2C/B and Mo2C/C,yet its CO selectivity was marginally lower than that of the other two catalysts.Upon comparative study of Ni-Mo2C/A,Cu-Mo2C/A,and Mo2C/A,it was evident that the incorporation of minor amounts of Ni and Cu could significantly enhance the reverse water-gas shift activity of the Mo2C catalyst.While the addition of Ni enhanced the CO2 conversion rate more than Cu,the presence of Ni notably reduced the CO selectivity.This suggested that the incorporation of Ni was more favorable for the formation of CH4,especially at low temperatures.At 300℃,the CO selectivity of the Ni-Mo2C/A catalyst was only 85%.In contrast,the Cu-Mo2C/A catalyst exhibited both a higher CO2 conversion rate and CO selectivity.Therefore,Cu-Mo2C/A was considered the most desirable catalyst for reverse water-gas shift reactions.
Saturation impregnationTemperature-programmed carbonizationReverse water gas reaction
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