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

Year 2020, Volume: 21 Issue: 1, 165 - 172, 31.03.2020

Hasan Özdemir

https://doi.org/10.18038/estubtda.583297

Cited By: 2

Abstract

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 (<30 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 was obtained at 720°C with Gd₂O₃-0.5
(8.5%).

Keywords

Gd2O3, solution combustion synthesis, oxidative coupling of methane

Supporting Institution

Istanbul University

Project Number

24133

Thanks

This study was supported by Istanbul University Research Fund through project no: 24133.

References

• Ahab A, Rohman F, Iskandar F, Haryanto F, Arif I. A simple straightforward thermal decomposition synthesis of PEG-covered Gd2O3 (Gd2O3@PEG) nanoparticles. Adv Powder Technol 2016; 27: 1800–1805. Lin C-C, Lin K-M, Li Y-Y. Sol–gel synthesis and photoluminescent characteristics of Eu3+-doped Gd2O3 nanophosphors. J Lumin 2007; 126: 795–799.
• Dhananjaya N, Nagabhushana H, Nagabhushana BM, Chakradhar RP., Shivakumara C, Rudraswamy B. Synthesis, characterization and photoluminescence properties of Gd2O3:Eu3+ nanophosphors prepared by solution combustion method. Phys B Condens Matter 2010; 405: 3795–3799. Müller A, Heim O, Panneerselvam M, Willert-Porada M. Polyol method for the preparation of nanosized Gd2O3, boehmite and other oxides. Mater Res Bull 2005; 40: 2153–2169.
• Goldys EM, Drozdowicz-Tomsia K, Jinjun S, Dosev D, Kennedy IM, Yatsunenko S, et al. Optical Characterization of Eu-Doped and Undoped Gd2O3 Nanoparticles Synthesized by the Hydrogen Flame Pyrolysis Method. J Am Chem Soc 2006; 128: 14498–14505.
• Liu G, Hong G, Wang J, Dong X. Hydrothermal synthesis of spherical and hollow Gd2O3:Eu3+ phosphors. J Alloys Compd 2007; 432: 200–2044.
• Wen W, Wu J-M. Nanomaterials via solution combustion synthesis: a step nearer to controllability. RSC Adv 2014; 4: 58090–58100.
• Tamrakar RK, Bisen DP, Brahme N. Comparison of photoluminescence properties of Gd2O3 phosphor synthesized by combustion and solid state reaction method. J Radiat Res Appl Sci 2014; 7: 550–559.
• Dhananjaya N, Nagabhushana H, Nagabhushana BM, Rudraswamy B, Sharma SC, Sunitha DV, et al. Effect of different fuels on structural, thermo and photoluminescent properties of Gd2O3 nanoparticles. Spectrochim Acta Part A Mol Biomol Spectrosc 2012; 96: 532–540.
• Sing KSW. Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984). Pure Appl Chem 1985; 57: 603–619.
• Kuo Y, Behrendt F, Lerch M. Effect of the Specific Surface Area of Li/MgO Catalysts in the Oxidative Coupling of Methane. Zeitschrift Für Phys Chemie 2007; 221: 1017–1037.
• Korf SJ, Roos JA, Diphoorn JM, Veehof RHJ, van Ommen JG, Ross JRH. The selective oxidation of methane to ethane and ethylene over doped and un-doped rare earth oxides. Catal Today 1989; 4: 279–292. Au CT, Chen KD, Ng CF. The modification of Gd2O3with BaO for the oxidative coupling of methane reactions. Appl Catal A Gen 1998;170:81–92.
• Özdemir H, Öksüzömer MAF, Ali Gürkaynak M. Studies on oxidative coupling of methane using Sm 2 O 3 -based catalysts. Chem Eng Commun 2019; 206: 48–60. Papa F, Luminita P, Osiceanu P, Birjega R, Akane M, Balint I. Acid–base properties of the active sites responsible for C2+ and CO2 formation over MO–Sm2O3 (M = Zn, Mg, Ca and Sr) mixed oxides in OCM reaction. J Mol Catal A Chem 2011; 346: 46–54.
• Elkins TW, Hagelin-Weaver HE. Oxidative coupling of methane over unsupported and alumina-supported samaria catalysts. Appl Catal A Gen 2013;454:100–114.