the effect of support materials on the kinetic behaviors of indium-based catalysts in carbon dioxide hydrogenation was studied. A series of supported indium-based catalysts were prepared and tested. Only
group ⅣB metal (Ti
Zr and Hf) oxide supported indium-based catalysts had substantial catalytic activity. Particularly
In
1
/HfO
2
and In
1
/ZrO
2
catalysts showed high methanol selectivity
while In
1
/TiO
2
mainly catalyzed the reverse water-gas shift reaction. Steady-state kinetics
in-situ
diffuse reflectance infrared Fourier transform spectroscopy and temperature-programmed experiments indicate that the key surface reaction intermediate over In
1
/HfO
2
and In
1
/ZrO
2
are formate and methoxy species
and methanol is produced
via
stepwise hydrogenation of the surface formate. In
1
/HfO
2
possesses the strongest hydrogen splitting and hydrogenation ability
thus favoring methanol synthesis. Over In
1
/TiO
2
no significant surface carbonaceous species was detected under reaction conditions. The improved CO production might be related to interfacial oxygen defects facilitating the redox cycle and decomposition of formate intermediate.
关键词
Keywords
references
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