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摘要
The M-modified TiO2 nanotubes (NTs) (M = Ce, Ga, Co, Y, 2.0 wt%) were synthesized by combining sol-gel method with hydrothermal treatment, based on which gold was loaded by the deposition-precipitation approach. These catalysts were loaded with 1.5 wt% gold and calcined at 300 A degrees C, and their catalytic performance was compared with Au/TiO2 NTs in CO oxidation. TEM results manifested Au/M-TiO2 NTs (M = Ce, Ga, Co, Y) had smaller gold nanoparticles than Au/TiO2 NTs. Patterns of XPS revealed the presence of the strong interaction between gold and support in Au/M-TiO2 NTs (M = Ce, Ga, Co, Y). Ce4+, Ga3+, Co2+, and Y3+ ions were present as CeO2, Ga2O3, CoO, and Y2O3 in Au/M-TiO2 NTs (M = Ce, Ga, Co, Y), respectively. Based on O-2-TPD studies, Au/M-TiO2 NTs (M = Ce, Ga, Co, Y) provided new O-2 adsorption sites for the adsorption and activation of oxygen in CO oxidation. M (M = Ce, Ga, Co, Y) modifying performed the positive effect on CO oxidation activity and Au/Y-TiO2 NTs showed the highest activity among these catalysts. Additionally, Au/Y-TiO2 NTs also performed excellent high-temperature stability. It was likely that the strong interaction between gold and support created the small size of gold nanoparticles, large O-2 adsorption and plenty of defects, thereby enhancing the catalytic activity of Au/M-TiO2 NTs (M = Ce, Ga, Co, Y).Au/M-TiO2 NTs (M = Ce, Ga, Co, Y) were successfully prepared for the first time. Au/M-TiO2 NTs (M = Ce, Ga, Co, Y) was highly efficient and sintering-resistant for CO oxidation. Au/M-TiO2 NTs (M = Ce, Ga, Co, Y) possessed better activity compared with Au/TiO2 NTs. Gold and support acted synergistically for the enhancement of property in Au/M-TiO2 NTs (M = Ce, Ga, Co, Y). [GRAPHICS] .
- 出版日期2018-6
- 单位南开大学
