TY  - JOUR
T1  - In situ transmission infrared spectroscopy of plasma-assisted CO2 hydrogenation on ZnO: Role of catalyst support materials
A1  - Saito, Atsushi
A1  - Sheng, Zunrong
A1  - Kim, Dae-Yeong
A1  - Imamura, Yutaka
A1  - Nozaki, Tomohiro
Y1  - 2021///
KW  - CO2 conversion
KW  - carbon recycling
KW  - in situ spectroscopy
KW  - plasma catalysis
KW  - nonthermal plasma
JF  - International Journal of Plasma Environmental Science and Technology
VL  - 15
IS  - 2
SP  - e02008
EP  - e02008
DO  - 10.34343/ijpest.2021.15.e02008
UR  - http://ijpest.com/Contents/15/2/e02008.html
N2  - Nonthermal plasma-assisted catalysis is shown to be capable of reducing carbon dioxide (CO2) in the presence of hydrogen (H2). Dielectric barrier discharge-type plasma-activated CO2 and H2 were irradiated on a zinc oxide (ZnO) catalyst, and the surface species and their reaction pathways were investigated via in situ transmission infrared absorption spectroscopy. In our previous study on in situ Raman spectroscopy of CO2 hydrogenation on Cu/ZnO, we found the various surface species were uniquely identified on ZnO when DBD was irradiated. Therefore, this study aimed particularly to investigate the effects of nonthermal plasma on support materials (ZnO) without copper. The infrared absorption peaks of the surface species were analyzed via density functional theory (DFT) calculations. Formate (HCOO), formyl group (HCO), and formaldehyde (H2CO) were generated as reaction products from the plasma and ZnO catalyst. Moreover, the process simultaneously produced plasma-activated hydrogen that adheres to ZnO and undercoordinated Zn in ZnO. These hydrogen adhesions and undercoordinated Zn sites did not appear in thermal reactions in the absence of plasma, suggesting that the plasma-activated hydrogen site in ZnO functions as an active site for the plasma catalytic reaction.
ER  -