title: Sonophotodeposition of bimetallic photocatalysts Pd-Au/TiO2 : application to selective oxidation of methanol to methyl formate.
abstract: The aim of this work is to develop bimetallic Pd-Au/TiO2 P90 systems, which are highly active and selective for the photocatalytic oxidation of methanol to form methyl formate. Modification of commercial TiO2 P90 with Pd-Au nanoparticles was successfully achieved for the first time by means of a sonophotodeposition (SPD) method. The prepared materials were characterized by TEM, UV/Vis spectroscopy, X-ray photoelectron spectroscopy, and powder XRD. The Pd-Au bimetallic nanoparticles supported on titania exhibited remarkably enhanced catalytic activity in selective methanol oxidation to form methyl formate due to the synergism of Au and Pd particles, as well as the strong interaction between TiO2 and Pd-Au. SPD is a green methodology that can be used to prepare well-defined bimetallic surfaces on semiconductor supports with great promise for catalytic applications, in which selectivity can be tuned through adjustment of the surface composition.
authors: Institute of Physical Chemistry PAS, Kasprzaka 44/52, 01-224 Warsaw (Poland). jcarloscolmenares@ichf.edu.pl.
authors: Juan C
authors: JC
authors: Colmenares
authors: Institute of Physical Chemistry PAS, Kasprzaka 44/52, 01-224 Warsaw (Poland).
authors: Paweł
authors: P
authors: Lisowski
authors: Institute of Physical Chemistry PAS, Kasprzaka 44/52, 01-224 Warsaw (Poland).
authors: Dariusz
authors: D
authors: Łomot
authors: Institute of Physical Chemistry PAS, Kasprzaka 44/52, 01-224 Warsaw (Poland).
authors: Olga
authors: O
authors: Chernyayeva
authors: Institute of Physical Chemistry PAS, Kasprzaka 44/52, 01-224 Warsaw (Poland).
authors: Dmytro
authors: D
authors: Lisovytskiy
mesh_terms: D002384:Catalysis; D005563:Formic Acid Esters / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects; D000432:Methanol / Q000737:chemistry*; D010084:Oxidation-Reduction; D010165:Palladium / Q000737:chemistry*; D013010:Sonication; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D005563:Formic Acid Esters; C009495:titanium dioxide; C025468:methyl formate; D010165:Palladium; D006046:Gold; D014025:Titanium; D000432:Methanol
keywords: gold; nanoparticles; oxidation; palladium; sonophotodeposition