Citation: Yuan Qin, Zhenping Qu, Cui Dong, Na Huang. Effect of pretreatment conditions on catalytic activity of Ag/SBA-15 catalyst for toluene oxidation[J]. Chinese Journal of Catalysis, ;2017, 38(9): 1603-1612. doi: 10.1016/S1872-2067(17)62842-0 shu

Effect of pretreatment conditions on catalytic activity of Ag/SBA-15 catalyst for toluene oxidation

Key Laboratory of Industrial Ecology and Environmental Engineering(MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, Liaoning, China

Received Date: 13 December 2016
Revised Date: 19 April 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21377016, 21577014) and Program for Changjiang Scholars and Innovative Research Team in University (IRT_13R05).

The catalytic oxidation of toluene over Ag/SBA-15 synthesized under different pretreatment condi-tions, including O₂ at 500℃ (denoted O500), H₂ at 500℃ (H500), and O₂ at 500℃ followed by H₂ at 300℃ (O500-H300) was studied. The pretreated samples were investigated by N₂ physisorption, X-ray diffraction, and ultraviolet-visible diffuse reflectance. The pretreatment atmosphere greatly influences the status of the Ag and O species, which in turn significantly impacts the adsorption and catalytic removal of toluene. Ag₂O and amorphous Ag particles, as well as a large amount of subsur-face oxygen species, are formed on O500, and the subsurface oxygen enhances the interaction be-tween Ag species and toluene, so O500 shows good activity at higher temperature. However, its activity at lower temperature is not as high as expected, with a reduced presence of Ag₂O and lower adsorption capacity for toluene. H₂ pretreatment at 500℃ is conducive to the formation of large Ag particles and yields the largest adsorption capacity for toluene, so H500 exhibits the best activity at lower temperatures; however, because of poor interaction between Ag and toluene, its activity at higher temperature is modest. The O500-H300 sample exhibits excellent catalytic activity during the whole reaction process, which can be attributed to the small and highly dispersed Ag nanoparti-cles as well as the existence of subsurface oxygen.
- SBA-15,
- Supported silver catalyst,
- Pretreatment condition,
- Competitive adsorption,
- Toluene oxidation
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