Preparation and Characterization of Aerogel and Xerogel Alumina Catalyste and Comparted it in Catalyst of Alunina Used as Support for some Metal Oxides

The Xerogel alumina catalyst was prepared by sol-gel method in non-aqueous milieu, and the aerogel alumina catalyst was prepared in the same method but it was dried at by supercritical conditions. These catalysts were characterized by XRD, BET, and chemical adsorption methods. The obtained results were compared to show the effect of preparation process on the structural properties of the alumina. Besides these results were compared with some oxides supported on alumina, and the effect of distribution of these oxides on the properties of alumina was investigated too.

Concrete mix design method according to referential structure and the aggregates specific surface area

This research presents new procedures to calculate the aggregates weight and the water requirement to realize a controlled concrete mixing design, where the aggregates proportion is defined by numerical method according to referential curve draw as referring to the proposed fine aggregate ratio and the required water will be calculated as referring to the aggregates surface area. The results showed the facility and the reliability of the proposed design procedures.