Versatile application of wet-oxidation for ambient CO abatement over Fe(OH)x supported subnanometer platinum group metal catalysts

Publication date: April 2020Source: Chinese Journal of Catalysis, Volume 41, Issue 4Author(s): Hongling Guan, Yang Chen, Chongyan Ruan, Jian Lin, Yang Su, Xiaodong Wang, Lingbo QuThe efficient and stable abatement of CO pollutant under ambient conditions is of great significance; however, it remains a formidable challenge. Herein, we report the versatile application of wet oxidation over Fe(OH)x supported subnanometer Pt group metal (PGM) catalysts for the complete removal of CO under ambient temperature and humidity conditions. Typically, the 1.8 wt% Rh/Fe(OH)x catalyst exhibited better durability during a ∼1400 min run for wet oxidation than for dry CO oxidation. Multiple characterization results including HR-TEM, H2-TPR, and in-situ DRIFTS suggested that Fe(OH)x, with good reducibility, promoted by the subnanometer Rh clusters, provided sites for the adsorption and reaction of O2 and H2O to form OH species. Subsequently, these OH species reacted with the adsorbed CO on Rh sites with a considerably lower activation energy (9 kJ mol−1) than that of dissociated O species (22 kJ mol−1), thus rationalizing the outstanding performance of Rh/Fe(OH)x for wet oxidation. Extended experiments with other PGMs revealed a good generality for the application of wet oxidation in the efficient abatement of CO under humid conditions with Fe(OH)x as the support.Graphical AbstractVersatile CO abatement under ambient conditions is achieved by wet-oxidation over Fe(OH)x supported subnanom...

Source: Chinese Journal of Catalysis - January 26, 2020 Category: Chemistry Source Type: research