Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia

OP-2-18ULTRASOUND-INDUCED FORMATION OF MESOPOROUSMULTIMETAL CATALYSTSDaria Andreeva 1 , Jana Schäferhans 1 , Ekaterina Skorb 2 , Nicolas Pazos Perez 11 Physikalische Chemie II, Universität Bayreuth,Universitatstr., 30, 95444, Bayreuth, GermanyTel.: +49(0)921552750; Fax: +49(0)921552059;Daria.andreeva@uni-bayreuth.de2 Max Planck Institute of Colloids and Interfaces,Am Mühlenberg, 1, 14476, Golm, GermanyWe study the ultrasound-driven formation of mesoporous multimetal sponges.The collapse of acoustic cavitations leads to very high temperatures and pressureson very short scales. Therefore, structures may be formed and quenched far fromequilibrium. Mechanism of metal modification by ultrasound is complex and involvesa variety of aspects. We propose that modification of metal particles and formation ofmesoporous inner structures can be achieved due to thermal etching of metals byultrasound stimulated high speed jets of liquid. Simultaneously, oxidation of metalsurfaces by free radicals produced in water during cavitation stabilizes developedmetal structures. Duration and intensity of the ultrasonication treatment is able tocontrol the structure and morphology of metal sponges. We expect that this approachto the formation of nanoscale composite sponges is universal and opens perspectivefor a whole new class of catalytic materials that can be prepared in a one-stepprocess. The developed method makes it possible to control the sponge morphologyand can be used for formation of modern types of catalysts. For example, thesonication technique allows to combine the fabrication of mesoporous support anddistribution of metal (Ni, Cu, Pd, Au, Pt, iron oxide etc.) nanoparticles in its pores intoa single step.62