Thermally stable and insoluble silver salts of 12-molybdophosphoric acid with varying amount of Ag cations were prepared. XRD results indicated the presence of single phase of AgxH3xPMo12O40 (0 < x < 3). FTIR and Raman results indicated that Ag was incorporated in the secondary structure of Keggin ion. The catalytic conversion of ethanol increased in the order of H3PMo > ... Read more

Catalytic oxidative cracking of propane has been investigated over nanosized gold supported Ce0.5Zr0.5O2 catalysts. Gold supported catalysts offered high propane conversions and selectivity to olefins than Pt supported catalysts under the same reaction conditions. Ce0.5Zr0.5O2 showed is slightly active, but enhancement in the catalytic activity was observed when the catalyst deposited with 0.2 wt% gold. Further improvement in catalytic activity ... Read more

Thermally stable nanoparticles (NPs) of anatase phase titania, TiO2, were prepared by calcinations of acidic peptization products of titania xerogel, TiO2∙xH2O, that formed via an eco-friendly method. The method was based on hydrolysis of titanium isopropoxide over a long time period under atmospheric conditions (temperature 25 ± 5 °C and humidity 50 ± 10‰). Acidic peptization accompanied with ultrasonic vibrations ... Read more

Zirconia was synthesized by sol–gel and posthydrothermal treatment under autogenous pressure in order to study the effect of synthesis methods on its structural and textural properties. On the basis of thermal analysis, in situ X-ray diffraction and Raman spectroscopy techniques, the synthesis processes exhibit similar thermal behavior and zirconia phase transformation. The effect of in situ calcination temperature on the ... Read more

The photocatalytic activities of a series of titanium dioxide (TiO2) based nanoparticles, synthesised via flame spray pyrolysis (FSP), have been investigated and compared with the commercially available Evonik Aeroxide® TiO2 P 25 (P 25). The effects of metal ions aluminium, tin and platinum, respectively, on the physical and chemical properties of the TiO2 nanoparticles are reported. The set of six ... Read more

Mesoporous ZrO2-supported iron oxide materials were prepared with nominal loadings of iron oxide of 5, 10, 15 and 20 wt.% using a modified co-precipitation method. The physicochemical properties of the catalysts were characterized by thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction, Raman spectroscopy, high resolution transmission electron microscopy, N2 adsorption, X-ray photoelectron spectroscopy and infrared spectroscopy methods. A delay in ... Read more

We describe a lab-scale closed-circulating test system for photocatalytic wastewater treatment. The system comprises a UV-LED photoreactor, a microcirculating fluid pump, and an in-stream sensor unit. The reactor can hold volumes up to 250 mL and is optimized to study the degradation of pollutant concentrations in the microgram to milligram per liter range using photocatalysts fixed to a planar surface ... Read more

The catalytic conversion of ethanol was carried out over H3PMo12O40·xH2O (H3PMo) and its substituted copper ions with formula Cu0.5xH3−xPMo12O40 (where x = 1, 2 and 3). Pure and Cu-substituted catalyst samples were calcined at 350 ◦C. The effect of copper ions substitution on the thermal behaviour, structural, acidic, surface and catalytic properties of the investigated samples were studied using TG, ... Read more

Nanocomposite materials containing 10% and 20% iron oxide/silica, Fe2O3/SiO2 (w/w), were prepared by direct hydrolysis of aqueous iron (III) nitrate solution in sols of freshly prepared spherical silica particles (Sto¨ber particles) present in their mother liquors. This was followed by aging, drying, calcination up to 600 °C through two different ramp rates, and then isothermal calcinations at 600 °C for ... Read more