Enhanced Benzene Oxidation of Sintered Pd/γ-Al2O3 Catalysts by SO2 Treatment

Shigenobu, Saki; Sugiyama, Takeharu; Hōjō, H.; Einaga, Hisahiro

doi:10.1007/s10562-022-04233-7

Cited by 2 publications

(1 citation statement)

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“…Figure 11 shows an in situ FTIR diagram of Au/FeO x /Al 2 O 3 and Pd-Au/FeO x /Al 2 O 3 after treatment with 2 ppm SO 2 for 1 h and 2 ppm H 2 S for 1 h at ambient temperature (25 °C). The surfaces of the carrier and catalyst formed -OH (3400–3800 cm −1 ), -COOH (1400–1600 cm −1 ), H 2 O (1600 cm −1 ), and S-O (~1000 cm −1 ) bonds [ 58 , 59 , 60 ]. Since there was the presence of air in the reaction gas, the negative peak in the figure was CO 2 in the air.…”

Section: Resultsmentioning

confidence: 99%

The Enhancement of CO Oxidation Performance and Stability in SO2 and H2S Environment on Pd-Au/FeOX/Al2O3 Catalysts

Wang²,

Liu

et al. 2023

Materials

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Carbon monoxide (CO) is a colourless, odourless, and toxic gas. Long-term exposure to high concentrations of CO causes poisoning and even death; therefore, CO removal is particularly important. Current research has focused on the efficient and rapid removal of CO via low-temperature (ambient) catalytic oxidation. Gold nanoparticles are widely used catalysts for the high-efficiency removal of high concentrations of CO at ambient temperature. However, easy poisoning and inactivation due to the presence of SO2 and H2S affect its activity and practical application. In this study, a bimetallic catalyst, Pd-Au/FeOx/Al2O3, with a Au:Pd ratio of 2:1 (wt%) was formed by adding Pd nanoparticles to a highly active Au/FeOx/Al2O3 catalyst. Its analysis and characterisation proved that it has improved catalytic activity for CO oxidation and excellent stability. A total conversion of 2500 ppm of CO at −30 °C was achieved. Furthermore, at ambient temperature and a volume space velocity of 13,000 h−1, 20,000 ppm CO was fully converted and maintained for 132 min. Density functional theory (DFT) calculations and in situ FTIR analysis revealed that Pd-Au/FeOx/Al2O3 exhibited stronger resistance to SO2 and H2S adsorption than the Au/FeOx/Al2O3 catalyst. This study provides a reference for the practical application of a CO catalyst with high performance and high environmental stability.

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Section: Resultsmentioning

confidence: 99%