TY  - JOUR
AU  - Kuhn, Andrew N.
AU  - Park, Rachel C.
AU  - Yu, Siying
AU  - Gao, Di
AU  - Zhang, Cheng
AU  - Zhang, Yuanhui
AU  - Yang, Hong
PY  - 2024
TI  - Valorization of carbon dioxide into C1 product via reverse water gas shift reaction using oxide-supported molybdenum carbides
JO  - Carbon Future
SN  - 2960-0561
SP  - 9200011
VL  - 1
IS  - 2
AB  - Conversion of carbon dioxide (CO2) to C1 products such as carbon monoxide (CO) is a critical step towards carbon valorization. The conversion has been largely carried out through the reverse water gas shift (RWGS) reaction using noble metal catalysts or copper-based nanostructures. Similarities in the electronic structures between beta phase molybdenum carbides (β-Mo2C) and platinum-group metals make them promising alternatives to traditional catalysts. In this work, we studied the effect of oxide supports (MOx, M = Al, Ce, Mg, Si, and Ti) on the formation and catalytic properties of  β-Mo2C nanoparticle catalysts. The β-Mo2C/SiO2 catalyst exhibited a mass activity of 372 μmolCO2∙ gMo2C−1∙s−1 at 400 °C and 1109 μmolCO2∙ gMo2C−1∙s−1 at 600 °C for the conversion of CO2. The β-Mo2C/SiO2 catalysts also maintained selectivity and showed structural stability in the on-stream study. The enhanced catalytic performance could be attributed to the size of nanocatalysts (4.7 nm), whereas the stability is related to the interaction with SiO2 and the low H2:CO2 feed ratio. This work highlights the application of amorphous silica in preparing metal carbide nanocatalysts. The rich defects and surface vacancies in the silica support greatly facilitate the high-rate and highly selective processes towards the valorization of CO2.
UR  - https://doi.org/10.26599/CF.2024.9200011
DO  - 10.26599/CF.2024.9200011