Pt mechanical dispersion on non-porous alumina for soot oxidation

Abstract

A sustainable mechanical method to disperse Pt particles on the surface of non-porous α-AlO microparticles is reported. The hierarchical Pt/α-AlO catalyst possesses a metal specific surface area one order of magnitude lower than the state-of-the-art γ-AlO – supported Pt catalysts of similar metal composition and high alumina specific surface area. The relatively large size of the Pt particles seems to favor the catalytic soot oxidation in spite of their relatively low dispersion. As a result, the temperature of half conversion (T = 440 °C) is lower when compared with conventional Pt/γ-AlO prepared by the wet impregnation chemical synthesis route.