Dry Reforming of Methane over GdFeO 3 -Based Catalysts
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Reforming of Methane over GdFeO3-Based Catalysts T. A. Kryuchkovaa, *, T. F. Sheshkoa, V. V. Kost’a, I. V. Chislovab, L. V. Yafarovab, I. A. Zverevab, and A. S. Lyadova, c, ** a Physical and Colloid Chemistry Department, Faculty of Science, Peoples’ Friendship University of Russia (RUDN University), Moscow, 117198 Russia b Institute of Chemistry, St. Petersburg State University, St. Petersburg, 198504 Russia cTopchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail: [email protected] **e-mail: [email protected]
Received May 2, 2020; revised May 7, 2020; accepted May 12, 2020
Abstract—Features of dry reforming of methane over perovskite-type complex oxide GdFeO3 synthesized by several methods (solid-phase, citrate–nitrate sol–gel, glycine–nitrate sol–gel syntheses) have been studied. It has been found that the use of the sol–gel method leads to the formation of porous catalysts consisting of nanosized particles. Significant differences in morphology and texture affect the catalytic properties of GdFeO3. The sample synthesized by the citrate–nitrate sol–gel method mediates the conversion of hydrogen contained the feed methane to molecular hydrogen at a selectivity of 90%. It has been shown that GdFeO3based catalysts exhibit a stable on-stream behavior for a long time. Keywords: dry reforming of methane (DRM), methane, ferrites, gadolinium, synthesis gas DOI: 10.1134/S0965544120090157
Dry reforming of methane (DRM) is an effective process to produce synthesis gas:
CH4 + CO2 → 2CO + 2H2. The synthesis gas produced by this method is characterized by a low H2/CO ratio and can be used in the synthesis of alcohols and aldehydes and in Fischer– Tropsch synthesis over iron catalysts [1, 2]. In addition, recently, this process has been considered as a possible method to recycle carbon dioxide, which is a greenhouse gas. The DRM process occurs with the use catalysts containing various transition metals (Ni, Ru, Rh, Pd, etc.) [3–5]. However, most of the known catalysts undergo rapid deactivation owing to the deposition of carbon, which is formed during methane cracking (CH4 → C + 2H2), on their surface [6]. Thus, the design of catalyst systems exhibiting a stable on-stream behavior for a long time is an urgent task facing the researchers. It is known that catalyst systems based on perovskite-type complex oxides are stable in high-temperature processes [7, 8] and the synthesis method can significantly affect the catalytic activity and target product selectivity [9]. In addition, it is known that, in some cases, the introduction of rare-earth elements into catalyst systems can lead to a significant increase in their lifetime [10–12]. Previous studies [13] showed that complex oxide GdFeO3
exhibits catalytic activity in the DRM process. There are no other published data on studies of perovskite structures based on gadolinium and iron as DRM catalysts. This study is focused on the DRM process over complex oxide GdFeO3 synthesized by several methods. EXPERIMENTAL Catalyst Synthes
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