PREPARATION OF Gd2O3 NANOMATERIALS VIA SOLUTION COMBUSTION SYNTHESIS FOR OXIDATIVE COUPLING OF METHANE.


Özdemir H.

ANADOLU UNIVERSITY JOURNAL OF SCIENCE AND TECHNOLOGY - A Applied Sciences and Engineering, cilt.21, sa.1, ss.165-172, 2020 (Hakemli Üniversite Dergisi)

  • Cilt numarası: 21 Konu: 1
  • Basım Tarihi: 2020
  • Doi Numarası: 10.18038/estubtda.583297
  • Dergi Adı: ANADOLU UNIVERSITY JOURNAL OF SCIENCE AND TECHNOLOGY - A Applied Sciences and Engineering
  • Sayfa Sayıları: ss.165-172

Özet

In this study, in the production of Gd2O3 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 (XRD), Brunauer-Emmett-Teller (BET) surface area, Thermogravimetric-Differential thermal analysis (TG-DTA) and scanning electron microscopy (SEM) analysis and tested in oxidative coupling of methane. Cubic and monoclinic phases were observed in Gd2O3 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 (18.6 m2 /g). It was determined that the powders were formed from rather small particles (<35 nm) and with layered or stacked structure. The catalytic performance of Gd2O3 nanoparticles was found to be dependent on the BET surface area and crystal structure. The highest C2 yield (8.5%) was obtained at 720°C with the Gd2O3 that was synthesized using the equivalence ratio of 0.5.