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Room-temperature CO oxidation over calcined Pd–Cu/palygorskite catalysts
Abstract Pd–Cu/palygorskite catalysts without calcination (U-PdCu/Pal) and with calcination (C-PdCu/Pal) were prepared via an impregnation method. These catalysts' catalytic performances for CO oxidation were studied. CO conversion can reach 100% at room temperature under conditions of 0.5vol.% CO and 3.3vol.% H2O in the feed gas over C-PdCu/Pal, which is considerably higher than that over U-PdCu/Pal. The XRD results suggest that the Cu species exists as a Cu(OH)Cl phase with a crystallite size of approximately 30nm on U-PdCu/Pal, while the crystallite size of the Cu(OH)Cl phase on C-PdCu/Pal is significantly smaller. The results of TPR and IR indicate that there is an enhanced interaction resulting from the calcination, which promotes the reduction of C-PdCu/Pal and enhances the catalytic activity.
Graphical abstract Display Omitted
Highlights Cu species exist as Cu(OH)Cl on the Pd–Cu/palygorskite without calcination. The Cu(OH)Cl phase remains stable even after calcination at 300°C. After calcination the crystalline size of Cu(OH)Cl becomes smaller. Calcination results in an enhanced interaction among Cu, Pd species and support. Calcination promotes the reduction and enhances the activity of the catalyst.
Room-temperature CO oxidation over calcined Pd–Cu/palygorskite catalysts
Abstract Pd–Cu/palygorskite catalysts without calcination (U-PdCu/Pal) and with calcination (C-PdCu/Pal) were prepared via an impregnation method. These catalysts' catalytic performances for CO oxidation were studied. CO conversion can reach 100% at room temperature under conditions of 0.5vol.% CO and 3.3vol.% H2O in the feed gas over C-PdCu/Pal, which is considerably higher than that over U-PdCu/Pal. The XRD results suggest that the Cu species exists as a Cu(OH)Cl phase with a crystallite size of approximately 30nm on U-PdCu/Pal, while the crystallite size of the Cu(OH)Cl phase on C-PdCu/Pal is significantly smaller. The results of TPR and IR indicate that there is an enhanced interaction resulting from the calcination, which promotes the reduction of C-PdCu/Pal and enhances the catalytic activity.
Graphical abstract Display Omitted
Highlights Cu species exist as Cu(OH)Cl on the Pd–Cu/palygorskite without calcination. The Cu(OH)Cl phase remains stable even after calcination at 300°C. After calcination the crystalline size of Cu(OH)Cl becomes smaller. Calcination results in an enhanced interaction among Cu, Pd species and support. Calcination promotes the reduction and enhances the activity of the catalyst.
Room-temperature CO oxidation over calcined Pd–Cu/palygorskite catalysts
Wang, Yongzhao (author) / Shi, Jing (author) / Wu, Ruifang (author) / Li, Xiao (author) / Zhao, Yongxiang (author)
Applied Clay Science ; 119 ; 126-131
2015-08-24
6 pages
Article (Journal)
Electronic Resource
English
Calcined palygorskite and smectite bearing marlstones as supplementary cementitious materials
| Springer Verlag | 2022
Calcined palygorskite and smectite bearing marlstones as supplementary cementitious materials
| Online Contents | 2022