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Ce-Sm-xCu cost efficient catalysts for H2 production through the glycerol steam reforming reaction

Abstract

A series of Ce-Sm-xCu, (x=5, 7, 10 at.%) catalysts were prepared using coupling of microwave radiation with sol-gel method and were evaluated for the glycerol steam reforming reaction in the 400-750oC temperature range. Some critical comparison with co-precipitation catalysts is also discussed. The catalysts were characterized using BET, Raman, XRD, NH3-TPD, CO2-TPD, H2-TPR, SEM, HAADF-STEM and XPS, whereas the catalysts precursor compounds bonding environment and thermal stability were studied using FTIR and TGA/DSC. For all catalysts it was found that the Ce, Sm, and Cu cations are all homogeneously distributed into the cubic fluorite cell with interplanar spacing of 0.355 nm, 0.370 nm and 0.373 nm for the Ce-Sm-5Cu, Ce-Sm-7Cu and Ce-Sm-10Cu catalysts, respectively. The surface of the catalysts was found to be Ce- and Cu-poor and Sm-rich, with Ce4+, Ce3+, Sm3+, Cu2+ and Cu+ oxidation states identified. In the bulk, the oxygen vacancies were found to be dependent on the catalyst composition (Cu content). Among the catalysts studied, the Ce-Sm-5Cu one exhibits the highest selectivity for hydrogen (H2) with its SH2 ranging from 40% (400oC) to 75% (750oC). The Ce-Sm-5Cu catalyst also produces the highest amount of CO (97-71%) and the lowest amount of CO2 (3-28%) between all samples for the low reaction temperature range (400oC<T<650oC and reaches the values of 7, 10 and 12 for the samples Ce-Sm-5Cu, Ce-Sm-7Cu, Ce-Sm-10Cu, respectively.All the catalysts, preserved a glycerol conversion of 80% after 6 h time on stream, whereas a plurality of coke species was found on their surfaces. A potenial correlation with Cu content and coke deposition was attempted.

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Publication details

The article was received on 27 Jul 2018, accepted on 30 Nov 2018 and first published on 11 Dec 2018


Article type: Paper
DOI: 10.1039/C8SE00388B
Citation: Sustainable Energy Fuels, 2019, Accepted Manuscript
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    Ce-Sm-xCu cost efficient catalysts for H2 production through the glycerol steam reforming reaction

    K. Polychronopoulou, N. D. Charisiou, G. Siakavelas, A. Khoori, V. Sebastian, S. Hinder, M. Baker and M. Goula, Sustainable Energy Fuels, 2019, Accepted Manuscript , DOI: 10.1039/C8SE00388B

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