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