Tailored aerosol synthesis of nanosized multicomponent catalysts

Abstract

Nanoparticles consisting of multiple components play a key role in the development of new materials and heterogeneous catalysts for novel types of energy conversion processes. This thesis demonstrates the flexibility of the Double Flame Spray Pyrolysis for the production of tailored multicomponent catalysts from almost all metals and transition metals by gas-to-particle conversion. Two experimental studies determine the optimal geometric process parameters of the two flames for the synthesis of highly active binary Fischer-Tropsch (FT) catalysts and ternary catalysts for the preferential oxidation of CO (CO-PrOx). Further investigates the thesis for the first time the main underlying process conditions during the double flame synthesis process e.g. the temperature profile of the intersecting flames and the mixing characteristic of the two components in the reaction zone. For the last one, two novel image based methods for the determination of the degree of mixing in deposited systems (active component on support: platinum (Pt) on titania (TiO2)) and in aggregated systems (two types of support: tungsten-oxide (WO3) and titania (TiO2)) are developed.