PREPARATION of Gd2O3 NANOMATERIALS via SOLUTION COMBUSTION SYNTHESIS FOR OXIDATIVE COUPLING OF METHANE

Authors : Hasan ÖZDEMİR

Pages : 165-172

Doi:10.18038/estubtda.583297

View : 10 | Download : 11

Publication Date : 2020-03-31

Article Type : Research Paper

Abstract :In this study, in the production of Gd 2 O 3 material which has many usage areas, solution combustion synthesis was used and the changes in the physical and structural properties of the material were investigated by changing the oxidant/fuel ratio. The resulting metal oxide powders were characterized by X-ray diffraction insert ignore into journalissuearticles values(XRD);, Brunauer-Emmett-Teller insert ignore into journalissuearticles values(BET); surface area, Thermogravimetric-Differential thermal analysis insert ignore into journalissuearticles values(TG-DTA); and scanning electron microscopy insert ignore into journalissuearticles values(SEM); analysis and tested in oxidative coupling of methane. Cubic and monoclinic phases were observed in Gd 2 O 3 crystal structure at fuel-rich and stoichiometric conditions, and only cubic phase was determined at fuel-lean conditions. It was determined that the obtained powders were mesoporous and the highest BET surface area was obtained at stoichiometric oxidant/fuel ratio insert ignore into journalissuearticles values(18.6 m 2 /g);. It was determined that the powders were formed from rather small particles insert ignore into journalissuearticles values(<30 nm); and with layered or stacked structure. T he catalytic performance of Gd 2 O 3 nanoparticles was found to be dependent on the BET surface area and crystal structure. The highest C 2 yield was obtained at 720°C with Gd 2 O 3 -0.5 insert ignore into journalissuearticles values(8.5%);.
Keywords : Gd2O3, solution combustion synthesis, oxidative coupling of methane