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

doi:10.1016/S1872-2067(17)62842-0

Abstract

Abstract:

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.

Key words: SBA-15, Supported silver catalyst, Pretreatment condition, Competitive adsorption, Toluene oxidation

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.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(17)62842-0

https://www.cjcatal.com/EN/Y2017/V38/I9/1603

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