Decisive role of Cu/Co interfaces in copper cobaltite derivatives for high performance CO2 methanation catalyst

Varga, Gábor and Szenti, Imre and Kiss, János and Baán, Kornélia and Halasi, Gyula and Óvári, László and Szamosvölgyi, Ákos and Mucsi, Róbert and Dodony, Erzsébet and Fogarassy, Zsolt and Pécz, Béla and Olivi, Luca and Sápi, András and Kukovecz, Ákos and Kónya, Zoltán (2023) Decisive role of Cu/Co interfaces in copper cobaltite derivatives for high performance CO2 methanation catalyst. JOURNAL OF CO2 UTILIZATION, 75. No. 102582. ISSN 2212-9820

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Thermo-catalytic bio-SNG (CH4) production is one of the useful tools for converting waste to gaseous fuels through CO2 conversion. To abundant properly, however, efficient, robust and cost-effective catalysts would be required. Bimetallic systems based on transition metals seem to be promising candidates for this task. The CoCu bimetallic system with in-situ generated interfaces was synthesized and used as a catalyst for CO2 methanation. The in-depth analysis of the structure-activity-selectivity relationships involving XRD, (NAP-)XPS, EXAFS and TEM-EDX revealed that the co-existence of Co0, CoO, and Cu0 in the proper distribution on the surface can ensure the selective production of methane. To fine-tune the surface composition of the bimetallic systems, a systematic alteration of the Cu:Co ratio in the precursor spinel structures must be performed. Cu0.4Co2.6O4 derivative, stabilizing subsurface Cu(I)–O specimen, showed the best performance with high activity (12,800 nmol g–1 s–1) and a remarkable selectivity of 65–85% for methane in a wide temperature range (250–425 ◦C). In studying the mechanistic aspects of methanation, it has been shown that the hydrogenation of active carbon at the surface or below the surface is the key step for the production of methane. So far, this cobalt-catalyzed sub-step has been proposed in catalytic Fischer-Tropsch syntheses.

Item Type: Article
Uncontrolled Keywords: Spinel precursors, CuCo bimetallic catalysis, Co/CoO/Cu interface, Efficient CO2 methanation, Structural aspects, Active carbon hydrogenation
Subjects: Q Science / természettudomány > QC Physics / fizika
Q Science / természettudomány > QD Chemistry / kémia
Depositing User: MTMT SWORD
Date Deposited: 31 Aug 2023 06:51
Last Modified: 31 Aug 2023 06:51

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