Mohamed M. M. Abd El-Wahab
Assiut University
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Featured researches published by Mohamed M. M. Abd El-Wahab.
Thermochimica Acta | 1993
Mohamed A. Abd-Alla; Mohamed M. M. Abd El-Wahab
Abstract A study of the non-isothermal decomposition of new aromatic polyphosphates (I–V) based on diarylidenecycloalkanone moieties has been carried out using TGA measurements at atmopsheric pressure. Analysis of non-isothermal TG and DTG curves of these polyphosphate esters indicated that their decompositions proceed in three stages. Kinetic parameters such as activation energy (Ea), pre-exponential factor (A) and entropy of activation (ΔS∗) for the whole samples at different decomposition stages are determined. The data showed that the thermal stability of polymers I–III decreases with increasing ring size of the diarylidenecycloalkanone moieties. The effect of the presence of -OCH3 groups upon the thermal properties of polymers is also discussed.
egyptian journal of basic and applied sciences | 2016
Abd El-Aziz A. Said; Mohamed M. M. Abd El-Wahab; Mohamed N. Goda
Abstract CuO–NiO nanocomposite catalysts were synthesized by an oxalate precipitation route. The basicity of the catalysts was measured using adsorption–desorption of acetic acid. The catalytic conversion of isopropanol to acetone was carried out in a conventional fixed bed flow type reactor at 200 °C using N2 as a carrier gas. The results indicated that, the addition of NiO to CuO greatly enhanced the electrical conductivity via the creation of new charge carriers (Cu+–Ni3+). In addition, the results revealed that the catalyst containing 30 wt.% NiO calcined at 400 °C possesses the highest catalytic activity with 98% conversion and 100% selectivity to acetone. The remarkable catalytic performance of the synthesized catalysts is attributed to the decrease of the energy gap, the increase in the concentration of charge carries (Cu+–Ni3+), and to the creation of more weak and intermediate basic sites.
High Performance Polymers | 1992
Mohamed M. M. Abd El-Wahab; Mohamed A. Abd-Alla
Studies of non-isothermal decomposition of certain iodo-organometallic arylidene polyesters and organometallic arylidene polyesters have been performed with TGA measurements at atmospheric pressure. The analysis of the non-isothermal TG and DTG curves of the samples under investigation revealed that their decomposition course proceeds via three stages. The kinetic parameters such as activation energy (E,), preexponential factor (A) and entropy of activation (AS*) for all polymers at different decomposition stages are determinedfrom an appropriate kinetic equation. More particularly, the data showed that the thermal stability of some of the polymers decreases with increasing ring size of arylidene moieties. Furthermore, the effect of absence of iodoand presence of-OCH3 groups upon the thermal properties of polymers was also evaluated.
Journal of Molecular Catalysis A-chemical | 2014
Abd El-Aziz A. Said; Mohamed M. M. Abd El-Wahab; Mohamed Abd El-Aal
Journal of Chemical Technology & Biotechnology | 2007
Abd El-Aziz A. Said; Mohamed M. M. Abd El-Wahab; Alian Mohamed Alian
Applied Surface Science | 2016
Abd El-Aziz A. Said; Mohamed M. M. Abd El-Wahab; Mohamed N. Goda
Resources and Environment | 2012
Abdel El-Aziz A. Said; Aref A. M. Aly; Mohamed M. M. Abd El-Wahab; Soliman A. Soliman; Aly A.Abd El-Hafez; V. Helmey; Mohamed N. Goda
Journal of Chemical Technology & Biotechnology | 2006
Abd Ei-Aziz A. Said; Mohamed M. M. Abd El-Wahab
Journal of Water Resource and Protection | 2013
Abd El-Aziz A. Said; Aref A. M. Aly; Mohamed M. M. Abd El-Wahab; Soliman A. Soliman; Aly A.Abd El-Hafez; V. Helmey; Mohamed N. Goda
Research on Chemical Intermediates | 2016
Abd El-Aziz A. Said; Mohamed M. M. Abd El-Wahab; Mohamed Abd El-Aal