Abstract
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.
Highlights
Carbon monoxide (CO) is a toxic and highly poisonous gas and is considered a silent killer that contributes indirectly to different environmental and health problems [1]
Supported metal nanoparticles are commonly used in heterogeneous catalytic processes, which are critical to various chemical reactions and can be used to solve the problem of individual metal oxides by protecting the in situ grown nanocatalysts from agglomeration [17]
A flaky layered microstructure was only shown for graphene oxide (GO) (Figure 1A), whereas in reduced graphene oxide (rGO), the surface morphology was relatively close (Figure 1B) due to GO exfoliation during ultrasonic treatment
Summary
Carbon monoxide (CO) is a toxic and highly poisonous gas and is considered a silent killer that contributes indirectly to different environmental and health problems [1]. Metal oxide catalysts are regarded as promising materials for industrial and environmental CO oxidation reactions [6] Their abundance, low cost and pronounced chemical stability make them a promising alternative to noble-metal based catalysts [7,8,9]. Supported metal nanoparticles are commonly used in heterogeneous catalytic processes, which are critical to various chemical reactions and can be used to solve the problem of individual metal oxides by protecting the in situ grown nanocatalysts from agglomeration [17]. The present first-of-a-type investigation studies the activity of unsupported and supported Cr2 O3 NPs on carbonaceous compounds (rGO and GO) as a catalyst for CO catalytic oxidation at low temperatures. Obtained hybrids of Cr2 O3 /rGO and Cr2 O3 /GO showed pronounced catalytic activity for the oxidation of CO at low temperatures
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