Synthesis and properties of large nanocrystalline Mo-W bimetallic oxide

T. Zaki, H. Hassan*, S. Mikhail

Department of Catalysis, Petroleum Refining Division,

Egyptian Petroleum Research Institute, 11727, Cairo, Arabic Republic of Egypt.

Abstract

Large nanosized Mo-W bimetallic oxide particles were successfully prepared by using modified pechini process that is based on low temperature polymerization-complexation steps via the ability of citric acid (CA) to carry out polyesterification with ethylene glycol (EG) and subsequently to form metal chalets through the non-reacted polar groups. Different resins have been prepared in order to compare the effect of the molar ratios of reactants on the size of final produced nanoparticles. The resin precursor and the final powders were characterized to investigate thermal decomposition, degree of crystallization, surface morphology and particles size by TG-DTA, XRD, BET, FTIR and TEM. The results indicated that the particle size showing on an ordinary tendency to increase with uniform size distribution and spherical morphology with decrease total metal (TM) and increase EG molar ratios both single.

Keywords : tungsten; molybdenum; Pichini method, polymeric route.

Corresponding author contact:

Heba Mohammed Hassan

Telephone: 002 02 22745902

Fax: 002 02 22747433

E-mail: hebachem@yahoo.com