Atomic layer deposition (ALD) was used to prepare a thin alumina on Fischer–Tropsch catalysts. Co-Pt-Si/γ-Al2O3 catalyst overcoated with 15–40 cycles of Al2O3 deposited from trimethylaluminum (TMA) and water vapor, followed by thermal annealing. The resulting tailored 35 cycle ALD overcoating had increased activity compared unmodified catalyst. increase in achieved without significant loss sele...

Liquid drops on deformable soft substrates exhibit quite complicated wetting behavior as compared to those rigid solid substrates. We report a of Co nanoparticles (NPs) sapphire substrate during pulsed laser-induced dewetting (PLID). NPs produced by PLID wetted the with contact angle near 70°, which is in contrast typical metal thin films exhibiting angles greater than 90°. In addition, nanosca...

H2 production through dry reforming of methane (DRM) is a hot topic amidst growing environmental and atom-economy concerns. Loading Ni-based reducible mixed oxide systems onto thermally stable support reliable approach for obtaining catalysts good dispersion high stability. Herein, NiO was dispersed over MOx-modified-γ-Al2O3 (M = Ti, Mo, Si, or W; x 2 3) incipient wetness impregnation followed ...

A first-principles study of the vibrational modes of PbTiO3 in the ferroelectric tetragonal phase has been performed at all the main symmetry points of the Brillouin zone ~BZ!. The calculations use the local-density approximation and ultrasoft pseudopotentials with a plane-wave basis, and reproduce well the available experimental information on the modes at the G point, including the LO-TO spli...

Alumina-supported manganese catalysts with cryptomelane and/or birnessite structure have been prepared using a simple method based on the thermal decomposition of potassium permanganate. The samples have been characterized by XRD, FTIR, TGA, DSC, N2 adsorption at −196 °C, SEM, H2-TPR and XPS, and their catalytic activity for soot combustion has been tested and compared to that of a reference Pt...

This study investigated a strategy of blending lead-laden sludge and Al-rich precursors to reduce the release of metals from the stabilized products. Using PbO as the simulated lead-laden sludge to sinter with γ-Al2O3 by Pb:Al molar ratios of 1:2 and 1:12, PbAl2O4 and PbAl12O19 were formed as final products during the sintering process, respectively. By firing the PbO + γ-Al2O3 mixtures with di...

Trace metals (e.g. Ni, Zn) leached from industrial and agricultural processes are often simultaneously present in contaminated soils and sediments. Their mobility, bioavailability, and ecotoxicity are affected by sorption and cosorption at mineral/solution interfaces. Cosorption of trace metals has been investigated at the macroscopic level, but there is not a clear understanding of the molecul...

The cataluminescence (CTL) of benzene and the benzene homologues toluene and xylene on nanosized γ–Al2O3 doped with Eu2O3 (γ–Al2O3/Eu2O3) was studied and a sensor of determining these gases was designed. The proposed sensor showed high sensitivity and selectivity at an optimal temperature of 432 oC, a wavelength of 425 nm and a flow rate of 400 mL/min. Quantitative analysis was performed at the...