Surface electronic state modulation promotes photoinduced aggregation and oxidation of trace CO for lossless purification of H2 stream

Liu，Haifeng1,3; Huang，Xiang2; Chen，Jiazang1,3

2023-08-01

Carbon monoxide oxidation Electronic states Hydrogen purification Hydroxyl radical Photocatalytic fixed bed reaction

English

National Natural Science Foundation of China[21773285];National Natural Science Foundation of China[22172185];

Although photogenerated hydroxyl radicals can oxidize CO without H consumption, the nonselective collision severely lowers photocatalytic photon utilization. We here demonstrate that electronic state modification of TiO resulted from magnesium doping can promote hydroxyl radical generation by weakening the adsorption of oxygen species and facilitating semiconductor-cocatalyst interfacial electron transfer. Importantly, the partial deprivation of electronic cloud from cationic sites can strengthen σ-donation and π-backdonation that synergistically promote the electrostatic interaction for aggregating CO in the vicinity of semiconductor. The resulted photocatalyst thus exhibits growing superiority over common counterpart in target reaction as CO concentration lowers. By these merits, CO in H stream can be reduced to < 1 × 10 with efficient photon utilization.

10.1016/S1872-2067(23)64483-3

Chinese Journal of Catalysis

51

49-54

Corresponding

2-s2.0-85170677336

Scopus

1872-2067

CHEMISTRY

1.State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan,Shanxi,030001,China
2.Department of Physics,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,100049,China

Liu，Haifeng,Huang，Xiang,Chen，Jiazang. Surface electronic state modulation promotes photoinduced aggregation and oxidation of trace CO for lossless purification of H2 stream. 2023-08-01.