Abstract
Ceria-supported Pd catalysts encompassing oxides of Cu, Co, and Fe were synthesized and characterized using XRD, TEM, SEM-EDX, TPR, BET, and Raman. After the incorporation of the metal oxides, the surface area and pore volume of the ceria support decreased. XRD showed the presence of the metal oxide phases as well as the support, CeO2. TPR showed that the bimetallic catalyst had improved reducibility compared to the monometallic Pd/CeO2. TEM images showed irregular-shaped particles with an average size distribution of 2–10 nm. SEM-EDX showed that the metal oxides were evenly distributed over the surface of the support. The electro-oxidation of glycerol in an alkaline environment was evaluated using cyclic voltammetry, and the products formed were identified and quantified using GC-MS. Glyceric acid was the dominant product over Pd-CuO/CeO2, while glyceraldehyde and dihydroxyacetone were dominant over Pd-Co3O4/CeO2 and Pd-Fe2O3/CeO2, respectively.
Highlights
Glycerol is used as a feedstock in the production of many valuable chemicals
The oxidation of glycerol forms a number of useful products such as dihydroxyacetone (DHA), which is used as an artificial tanning agent in cosmetics; tartronic acid (TA), which is an additive in candy, drinks, and wine; glyceric acid (GA), which is used in polymers and biodegradable emulsifiers; and mexosalic acid (MA), which is a biomarker in foods [1,5]
We report the synthesis and characterization of ceria-supported Cu, Fe, and Co metal oxides promoted with Pd for potential application in the electro-oxidation of glycerol in alkaline media
Summary
Glycerol is used as a feedstock in the production of many valuable chemicals. It is the main by-product in the transesterification of vegetable oil into biodiesel. Simões et al [9] used Pd/C, Au/C, Pd0.5 Ni0.5 /C, and Pd0.5 Au0.5 /C to evaluate glycerol electro-oxidation in alkaline media to produce value-added chemicals and energy cogeneration They reported that bimetallic PdAu presents a shift of the onset potential almost 0.1 V toward lower potentials than the monometallic Au/C and Pd/C catalysts. We report the synthesis and characterization of ceria-supported Cu, Fe, and Co metal oxides promoted with Pd for potential application in the electro-oxidation of glycerol in alkaline media. These metal oxides were chosen with the focus on costeffective transition metal-based catalysts. Ceria produces oxygenated species during alcohol oxidation, facilitating the process [14]
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