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Low-Temperature Catalytic CO Oxidation Over Non-Noble, Efficient Chromia in Reduced Graphene Oxide and Graphene Oxide Nanocomposites

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Science Department, College of Basic Education, Public Authority of Applied Education and Training (PAAET), P.O. Box 23167, Safat 13092, Kuwait
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Chemistry Department, Faculty of Science, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait
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Chemistry Department, Faculty of Science, Minia University, El-Minia 61519, Egypt
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Electrochemistry Laboratory, Physical Chemistry Department, National Research Centre, Dokki, P.O. 12622, Giza, Egypt
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Authors to whom correspondence should be addressed.
Catalysts 2020, 10(1), 105; https://doi.org/10.3390/catal10010105
Received: 3 December 2019 / Revised: 5 January 2020 / Accepted: 8 January 2020 / Published: 11 January 2020
Herein, bare chromia nanoparticles (Cr2O3 NPs) and chromia supported on reduced graphene oxide (rGO) and graphene oxide (GO) hybrids were synthesized, followed by characterization by means of FESEM, Raman spectroscopy, TGA, XRD, TEM/HRTEM, XPS and N2 sorptiometry. The investigated bare Cr2O3 and the hybrids (Cr2O3/rGO and Cr2O3/GO) were employed as catalysts for low-temperature CO oxidation. Compared with the other catalysts, the results revealed efficient catalytic activity using Cr2O3/GO, which was attributed to its higher surface area together with the mixed oxidation state of chromium (Cr3+ and Cr>3+). These are important oxidation sites that facilitate the electron mobility essential for CO oxidation. Moreover, the presence of carbon vacancy defects and functional groups facilitate the stabilizing of Cr2O3 NPs on its surface, forming a thermally stable hybrid material, which assists the CO oxidation process. The Cr2O3/GO hybrid is a promising low-cost and efficient catalyst for CO oxidation at low temperatures. The higher activity of graphene oxide supported Cr2O3 NPs can provide an efficient and cost-effective solution to a prominent environmental problem. View Full-Text
Keywords: chromium oxide NPs; CO oxidation; Cr2O3/carbonaceous hybrid; catalysis chromium oxide NPs; CO oxidation; Cr2O3/carbonaceous hybrid; catalysis
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Ali, A.A.; Madkour, M.; Sagheer, F.A.; Zaki, M.I.; Abdel Nazeer, A. Low-Temperature Catalytic CO Oxidation Over Non-Noble, Efficient Chromia in Reduced Graphene Oxide and Graphene Oxide Nanocomposites. Catalysts 2020, 10, 105.

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