TY - JOUR
T1 - NO Reduction with CO on Low-loaded Platinum-group Metals (Rh, Ru, Pd, Pt, and Ir) Atomically Dispersed on Ceria
AU - Tian, Jinshu
AU - Khivantsev, Konstantin
AU - Lu, Yubing
AU - Xue, Sichuang
AU - Zhang, Zihao
AU - Szanyi, János
AU - Wang, Yong
N1 - Publisher Copyright:
© 2024 Battelle Memorial Institute. ChemCatChem published by Chemistry Europe and Wiley-VCH GmbH.
PY - 2024/4/8
Y1 - 2024/4/8
N2 - Low-loaded platinum-group single-atom catalysts on CeO2 (M1/CeO2) were synthesized via high-temperature atom trapping (AT) and tested for the NO+CO reaction under dry and wet conditions. The activity of these catalysts for NO+CO reaction follows the order Rh>Pd≈Ru>Pt>Ir. For Rh, Ru, and Pd single-atom catalysts, the N2O byproduct is formed but not clearly observed in Ir and Pt cases, which may result from the higher reaction temperature (>200 °C) required for Pt and Ir catalysts. The presence of water can promote the activity of these M1/CeO2 catalysts for the NO+CO reaction. Under wet conditions, significant NH3 formation occurred during the reaction, which is due to the co-existence of water-gas-shift reaction on these catalysts. Compared with Pt, Pd and Ir, the Rh and Ru single-atom catalysts show higher selectivity to NH3 species, resulting from the hydride species on the surface. Among all tested catalysts, Ru1/CeO2 shows the highest production of ammonia and highest CO conversion due to excellent water-gas-shift activity, whereas Pd1/CeO2 shows lowest ammonia production. Rh1/CeO2 shows the best low temperature NO reduction activity among all tested catalysts.
AB - Low-loaded platinum-group single-atom catalysts on CeO2 (M1/CeO2) were synthesized via high-temperature atom trapping (AT) and tested for the NO+CO reaction under dry and wet conditions. The activity of these catalysts for NO+CO reaction follows the order Rh>Pd≈Ru>Pt>Ir. For Rh, Ru, and Pd single-atom catalysts, the N2O byproduct is formed but not clearly observed in Ir and Pt cases, which may result from the higher reaction temperature (>200 °C) required for Pt and Ir catalysts. The presence of water can promote the activity of these M1/CeO2 catalysts for the NO+CO reaction. Under wet conditions, significant NH3 formation occurred during the reaction, which is due to the co-existence of water-gas-shift reaction on these catalysts. Compared with Pt, Pd and Ir, the Rh and Ru single-atom catalysts show higher selectivity to NH3 species, resulting from the hydride species on the surface. Among all tested catalysts, Ru1/CeO2 shows the highest production of ammonia and highest CO conversion due to excellent water-gas-shift activity, whereas Pd1/CeO2 shows lowest ammonia production. Rh1/CeO2 shows the best low temperature NO reduction activity among all tested catalysts.
KW - Atomically dispersed metals on ceria
KW - Hydride species
KW - Nitric oxide reduction
KW - Rhodium, platinum, plaaldium ruthenium, iridium for nitric oxide abatement
UR - https://www.scopus.com/pages/publications/85184439448
U2 - 10.1002/cctc.202301227
DO - 10.1002/cctc.202301227
M3 - 文章
AN - SCOPUS:85184439448
SN - 1867-3880
VL - 16
JO - ChemCatChem
JF - ChemCatChem
IS - 7
M1 - e202301227
ER -