EFFECT OF THE B-SITE CATION IN GDBO3 (B = FE, MN, CO) PEROVSKITE-TYPE OXIDES ON CATALYTIC PERFORMANCES FOR SYNGAS PRODUCTION

1 KRYUCHKOVA Tatiana
Co-authors:
1 SHESHKO Tatiana 1 ZIMINA Victoriya 1 KURILKIN Vladimir 1 SEROV Yurii 2 ZVEREVA Irina 2 YAFAROVA Liliya
Institutions:
1 Peoples’ Friendship University of Russia, Faculty of Science, Moscow, Russia, kryuchkova_ta@list.ru
2 Saint-Petersburg State University, Petrodvorets, Saint-Petersburg, Russia
Conference:
9th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 18th - 20th 2017
Proceedings:
Proceedings 9th International Conference on Nanomaterials - Research & Application
Pages:
327-332
ISBN:
978-80-87294-81-9
ISSN:
2694-930X
Published:
8th March 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
128 views / 34 downloads
Abstract

Perovskite-type compounds are an important class of materials and there are extensively studied in high-temperature catalytic processes. Dry (carbon dioxide) reforming of methane (DRM) to synthesis gas is one of the most important reactions using such materials as catalysts. In this study, perovskite-type complex oxides GdBO3 (B = Fe, Mn, Co) applied as catalysts for syngas production via dry reforming of methane. These samples were obtained by ceramic technology and were investigated by means of X-ray diffraction, scanning electron microscopy, Mossbauer microscopy, and X-ray photoelectron spectroscopy. Catalytic activities were evaluated at atmospheric pressure in the temperature raised from 773 to 1223 K under continuous flow of reactant gases with a CH4:CO2 = 1:1 ratio. The test samples catalytic activity depends on the oxygen stoichiometry in the complex oxide. Thus, the presence of oxygen vacancies in the perovskite containing cobalt cation in the B-site of the perovskite structure proved to be favorable for DRM. It was on this sample that conversions of CH4 and CO2 were the maximum values of 99 and 97% at 1223 K, respectively, while syngas was obtained with H2/CO molar ratio close to unity. Besides, GdCoO3 showed the high stability in the DRM process: the catalytic performances retained more than 110 h time. The presence of oxygen vacancies is probably due to the crystallographic radius size of the cation introduced into the B-site of the complex oxide. Therefore, the catalytic activities of the investigated samples increased in the order: GdMnO3 < GdFeO3 < GdCoO3.

Keywords: perovskite-type oxide, syngas, dry reforming of methane, activity, oxygen mobility

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