Pt mechanical dispersion on non-porous alumina for soot oxidation

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.The authors thank the funding bodies of the projects NANOMIND CSIC201560E068 and MAT2017-86450-C4-1-R. C.M. Alvarez-Docio is also thankful for a FPI grant BES-2014-069779, which is co-financed by FEDER funds. F. Rubio-Marcos is indebted to MINECO for a ‘Ramon y Cajal’ contract (ref: RyC-2015-18626), which is co-financed by the European Social Fund. F.R-M also acknowledges support from Leonardo Grant for Researchers and Cultural Creators (2018), BBVA Foundatio