NiMoO4 catalysts supported on TiO2 (anatase) were prepared using two procedures: (i) wet impregnation of the support with an aqueous suspension of NiMoO4 and (ii) direct precipitation of NiMoO4 on the support surface using solutions of nickel nitrate and ammonia heptamolybdate. The catalysts and their precursors were characterised by XRD and TG/DTA and the catalytic behaviour of TiO2-supported NiMoO4 for the oxidative dehydrogenation of isobutane

The oxidative dehydrogenation of isobutane over SiO2-supported and unsupported NiMoO4 was studied under steady state conditions and the effect of active phase loading analysed. The SiO2-supported catalysts were prepared by direct precipitation of NiMoO4 on the support and characterised by BET, X-ray diffraction and temperature-programmed desorption of NH3. Used catalysts were characterised by thermal analysis. Results show that, in SiO2-supported

Catalysts containing Ni(2,2′-bipyridine)2Cl2 complex (K) encapsulated in Y zeolite cages (Ke/Y) or obtained by impregnation–complexation (Ki–c/Y), co-activated with AlCl(C2H5)2 show good activity and selectivity for ethylene dimerization at 333 K and W/F = 37 gcat h (moles C2H4)−1 molar contact time. Ke/Y co-activated with AlCl(C2H5)2 led to an ethylene conversion of 72.5% and 74.5% selectivity to C4H8, the prevailing isomer being 1-butylene.

This work presents results concerning the catalytic behaviour of silica-supported Zirconium (Zr)-doped NiMoO4 catalyst (NiMoZr1%Si) in the metathesis of 1-octene compared to that of the pure NiMoO4 (NiMo) and the un-doped supported catalyst (NiMoSi). The effect of doping on the physico-chemical properties of the catalysts is also investigated using X-ray diffraction (XRD), Fourier transformed infrared (FTIR), Raman spectroscopy, Brunnauer-Emmet-Teller

The absence of ageing step in the coprecipitation method leads to modification of textural and structural properties of Mg0.75Al0.25 hydrotalcites which are reflected in the “memory effect” and in the catalytic activity of these samples for cyanoethylation reaction between ethanol and acrylonitrile where the betaethoxypropionitrile is the prevailing reaction product. The solids were characterised by XRD, DRIFT, TEM and base sites determination

A 2-way factorial design was used for the study of rheological properties of clinoptilolite pastes. For all clinoptilolite samples, studies were performed for 4 levels of plasticizer content in ceramic mixtures and 7 levels for shear rate γ variation, without replicates. The analysis of variance (ANOVA) was conducted with MathCAD software (version 14.0). Comparisons among treatments were analysed using Fisher’s least significant difference, with