title: Particle shape optimization by changing from an isotropic to an anisotropic nanostructure: preparation of highly active and stable supported Pt catalysts in microemulsions.
abstract: We recently introduced a new method to synthesize an active and stable Pt catalyst, namely thermo-destabilization of microemulsions (see R. Y. Parapat, V. Parwoto, M. Schwarze, B. Zhang, D. S. Su and R. Schomäcker, J. Mater. Chem., 2012, 22 (23), 11605-11614). We are able to produce Pt nanocrystals with a small size (2.5 nm) of an isotropic structure i.e. truncated octahedral and deposit them well on support materials. Although we have obtained good results, the performance of the catalyst still needed to be improved and optimized. We followed the strategy to retain the small size but change the shape to an anisotropic structure of Pt nanocrystals which produces more active sites by means of a weaker reducing agent. We found that our catalysts are more active than those we reported before and even show the potential to be applied in a challenging reaction such as hydrogenation of levulinic acid.
authors.affiliation: Technische Universität Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany. Institut Teknologi Nasional (Itenas), Jl. PHH. Mustafa No. 23, 40124 Bandung, Indonesia
authors.forename: Riny Y
authors.initials: RY
authors.lastname: Parapat
authors.forename: Muliany
authors.initials: M
authors.lastname: Wijaya
authors.forename: Michael
authors.initials: M
authors.lastname: Schwarze
authors.forename: Sören
authors.initials: S
authors.lastname: Selve
authors.forename: Marc
authors.initials: M
authors.lastname: Willinger
authors.forename: Reinhard
authors.initials: R
authors.lastname: Schomäcker
mesh_terms: D016880:Anisotropy; D002384:Catalysis; D020134:Catalytic Domain; D003437:Crotonates / Q000737:chemistry; D003712:Dendrites / Q000737:chemistry; D004655:Emulsions; D006859:Hydrogen / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007982:Levulinic Acids / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D008823:Micelles; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D013386:Succinates / Q000737:chemistry; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D003437:Crotonates; D004655:Emulsions; D007982:Levulinic Acids; D008823:Micelles; D013386:Succinates; D013501:Surface-Active Agents; D010984:Platinum; D006859:Hydrogen; C005229:itaconic acid; C032246:levulinic acid