Choi, Sungjun Sang, Byoung-In Hong, Jongsup Yoon, Kyung Joong Son, Ji-Won Lee, Jong-Ho Kim, Byung-Kook Kim, Hyoungchul 2024-01-20T02:31:05Z 2024-01-20T02:31:05Z 2021-09-01 2017-01-25 2045-2322 https://pubs.kist.re.kr/handle/201004/123177 High-temperature chemical reactions are ubiquitous in (electro) chemical applications designed to meet the growing demands of environmental and energy protection. However, the fundamental understanding and optimization of such reactions are great challenges because they are hampered by the spontaneous, dynamic, and high-temperature conditions. Here, we investigated the roles of metal catalysts (Pd, Ni, Cu, and Ag) in the high-temperature reverse water-gas shift (RWGS) reaction using in-situ surface analyses and density functional theory (DFT) calculations. Catalysts were prepared by the deposition-precipitation method with urea hydrolysis and freeze-drying. Most metals show a maximum catalytic activity during the RWGS reaction (reaching the thermodynamic conversion limit) with formate groups as an intermediate adsorbed species, while Ag metal has limited activity with the carbonate species on its surface. According to DFT calculations, such carbonate groups result from the suppressed dissociation and adsorption of hydrogen on the Ag surface, which is in good agreement with the experimental RWGS results. English NATURE PUBLISHING GROUP GAS-SHIFT REACTION CARBON-DIOXIDE METHANE SUPPRESSION CO2 CONVERSION ENERGY CEO2 HYDROGENATION INTERMEDIATE ADSORPTION MECHANISM Catalytic behavior of metal catalysts in high-temperature RWGS reaction: In-situ FT-IR experiments and first-principles calculations Article 10.1038/srep41207 1 SCIENTIFIC REPORTS, v.7 SCIENTIFIC REPORTS 7 scie scopus 000392666700001 2-s2.0-85010723370 Multidisciplinary Sciences Science & Technology - Other Topics Article GAS-SHIFT REACTION CARBON-DIOXIDE METHANE SUPPRESSION CO2 CONVERSION ENERGY CEO2 HYDROGENATION INTERMEDIATE ADSORPTION MECHANISM metal catalysts RWGS reaction FT-IR first-principles CO2 conversion