Article ID Journal Published Year Pages File Type
6455001 Applied Catalysis B: Environmental 2017 12 Pages PDF
Abstract

•Pd-FeOx/SiO2 catalyst was found to be highly active for the HDO of furan compounds.•The presence of iron species restrains the CC cleavage over the Pd/SiO2 catalyst.•The presence of FeOx decreases the hydrogen pressure requirement for HDO process.•The synergism effect of Pd and Fe species leads to the high activity of catalyst.

For the first time, the Pd/SiO2 which was modified by FeOx species (Pd-FeOx/SiO2) was reported as an active catalyst for the solvent-free hydrodeoxygenation (HDO) of the aldol condensation product of furfural and methyl-isobutylketone (MIBK). The presence of iron species not only restrains the CC cleavage (decarbonylation and retro-aldol condensation) over the Pd/SiO2 catalyst but also decreases the hydrogen pressure which is needed for the total HDO of aldol condensation product over the Pd/SiO2 catalyst. Compared with the Pd/SiO2 catalyst, the Pd-FeOx/SiO2 catalyst also exhibited higher activity for the HDO of other furan compounds under atmospheric pressure. Over the 5%Pd-2.5%FeOx/SiO2 catalyst, complete conversion of feedstocks and high carbon yields of jet fuel range alkanes (87-94%) can be achieved by the atmospheric HDO of a series of furan compounds at 623 K or 573 K. From the results of XRD, STEM, CO chemisorption, FT-IR, EXAFS, H2-TPR, in-situ XPS and quasi-in-situ Mössbauer spectra, it was noticed that the modification of iron species decreases the coordination number of Pd-Pd on the Pd/SiO2 catalyst, which may restrain the decarbonylation during the HDO process. The presence of Pd promotes the reduction of iron species and the generation of Pd-Fe alloy. Both effects may be the reasons why the Pd-FeOx/SiO2 catalyst is more active than Pd/SiO2 in the solvent-free HDO of furan compounds under atmospheric pressure.

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Physical Sciences and Engineering Chemical Engineering Catalysis
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