Boosting reverse water-gas shift reaction activity of Pt nanoparticles through light doping of W

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-07, Vol.9 (28), p.15613-15617
• Main Authors: Kobayashi, Daiya, Kobayashi, Hirokazu, Kusada, Kohei, Yamamoto, Tomokazu, Toriyama, Takaaki, Matsumura, Syo, Kawaguchi, Shogo, Kubota, Yoshiki, Haneda, Masaaki, Aspera, Susan Meñez, Nakanishi, Hiroshi, Arai, Shigebumi, Kitagawa, Hiroshi
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Carbon dioxide; Catalysts; Durability; Endothermic reactions; Gold; Low temperature; Methanation; Nanoparticles; Shift reaction; Synchrotrons; Transitional aluminas
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/d1ta03480d

The reverse water-gas shift (RWGS) reaction is an important reaction from the viewpoint of converting CO 2 into CO as an important raw material compound. As the RWGS reaction is a mildly endothermic and competitive reaction with CO 2 methanation, it is important to improve the activity at low temperatures. Here, we report PtW nanoparticles (NPs) supported on γ-Al 2 O 3 (PtW NPs/Al 2 O 3 ) in which Pt and W were randomly mixed for obtaining a highly active and selective catalyst for the RWGS. At low temperatures of 200 and 300 °C, PtW NPs/Al 2 O 3 exhibited 16- and 17-times higher activity than Pt/Al 2 O 3 , one of the most promising catalysts. The enhanced activity of PtW NPs originated from alloying Pt with W, which contributes to the sintering resistance of Pt NPs, and promotion of CO 2 adsorption and CO desorption on the catalyst. Furthermore, PtW NPs/Al 2 O 3 exhibited high durability and excellent catalytic performance. We report PtW solid-solution alloy nanoparticles (NPs) as a reverse water-gas shift (RWGS) reaction catalyst for the first time. Atomic-level alloying of Pt and W significantly enhanced the RWGS reaction activity of Pt NPs.