Heterogeneous catalysis, which is widely used in the chemical industry, makes a great use of supported late-transition-metal nanoparticles, and bimetallic catalysts often show superior catalytic performances as compared to their single metal counterparts. In order to optimize catalyst efficiency and discover new active combinations, an atomic-level understanding and control of the catalyst stru...

The interaction of water with TiO2 is crucial to many of its practical applications, including photocatalytic water splitting. Following the first demonstration of this phenomenon 40 years ago there have been numerous studies of the rutile single-crystal TiO2(110) interface with water. This has provided an atomic-level understanding of the water-TiO2 interaction. However, nearly all of the prev...

Bimetallic AuPd nanoparticles supported on TiO2 are known to catalyze the reduction of NO with CO. Here, we investigated effects addition lanthanum oxide a AuPd/TiO2 catalyst particle size 2.1–2.2 nm. The La2O3 enhanced catalytic activity; for example, at 250 °C, there was 40.9% conversion and 49.3% N2-selectivity AuPd/TiO2, 100% AuPd-La (1:1)/TiO2. temperature requiring dropped from 400 °C 200...

Titania supported vanadium oxide catalysts have been demonstrated to be very efficient catalysts for the selective reduction of NOx with NH3 and have found widespread industrial application for the control of NOx emissions from stationary sources (1). Characterization studies have demonstrated that supported vanadium oxide catalysts consist of a two-dimensional metal oxide overlayer on the oxid...

The interaction of chromium oxide with different titania-silica supports has been examined. The oxide supports investigated consisted of SiO,, TiO, , physical mixtures of TiO, and SiO,, a surface titania overlayer on SiO, (10% of theoretical monolayer) and a surface silica overlayer on TiO, (80% of theoretical monolayer). The supported chromium oxide catalysts were structurally characterized wi...

The feasibility of synthesizing metal–oxide–metal (MOM) heterojunction nanowires in the Au–TiO2–Au system is demonstrated. The synthesis method presented here entails sequential electroplating of Au and electro-deposition of amorphous titanium oxide (TiOx ) inside nanoholes of anodic aluminium oxide (AAO) templates. This is followed by dissolving the template, and heat-treating the released nan...

Elastic-peak electron spectroscopy (EPES) has been one of the main tools for obtaining the inelastic mean free path of electrons in solids. Recently it has become clear that, if this type of experiment is done using an energetic electron beam (20–40 keV) and large scattering angles, then the recoil energies of the elastic scattering event for different elements can be resolved. This recoil ener...

The optical gas sensing properties of gold (Au) nanoparticles (NPs) doped into titanium dioxide (TiO2 matrix prepared by sol–gel method and annealed at different temperatures have been investigated. AFM images reveal that the Au NPs are exuded from the film during annealing. The chemical interaction of the hydrogen (H2 and carbon monoxide (CO) molecules on the Au surface will increase the overa...

Aiming at an improved mechanistic understanding of the preferential oxidation of CO on supported Au catalysts, we have investigated the competition between CO and H2 for stable, active oxygen (Oact) species on a Au/TiO2 catalyst during the simultaneous exposure to CO and H2 with various CO/H2 ratios at 80 ̋C and 400 ̋C by quantitative temporal analysis of products (TAP) reactor measurements. It...

The semiconductors decorated with noble metals or magnetic metals have attracted increasing attention due to multifunctional properties. In this article, we prepare novel bimetallic core/shell nanoparticle (Co@Au and Co@Ag)-decorated 3D urchin-like hierarchical TiO2 nanostructures through combining electroless plating and in situ replacement processes. The morphology and structure are character...