The use of alkaline earth oxides as pH modifiers for selective glycerol oxidation over supported Au catalysts

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Title: The use of alkaline earth oxides as pH modifiers for selective glycerol oxidation over supported Au catalysts
Authors: Sullivan, James A.
Burnham, Sarah
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Date: 2015
Abstract: The activity and selectivity of an Au/TiO2 catalyst in a reaction mixture which has had its pH adjusted by the addition of NaOH (aq) is compared to that of the same catalyst in reaction mixtures whose pH was adjusted using suspensions of BaO and CaO. It was found that the suspensions acted as effective bases and reactions in their presence showed similar conversions to those where NaOH(aq) was used. The selectivities of the reactions were different in each case. In all cases dihydroxyacetone, glyceric acid, glycolic acid and formic acid was produced but more glyceric acid was produced when alkaline earth oxide suspensions were used (at the expense of glycolic and formic acid) than when NaOH(aq) was used. Given glycolic and formic acids are produced from oxidation of glyceric acid, it seems that glyceric acid is somewhat stabilized against further oxidation in the presence of the group II oxides. One explanation for this is the formation of glyceric acid hemicalcium salts (and analogous Ba2+ species) in solution.
Funding Details: Irish Research Council for Science, Engineering and Technology
Type of material: Journal Article
Publisher: Elsevier
Journal: Renewable Energy
Volume: 78
Start page: 89
End page: 92
Keywords: BiodieselGlycerolCatalysisGlycerol oxidationBasic materialsGroup II oxides
DOI: 10.1016/j.renene.2014.12.068
Language: en
Status of Item: Peer reviewed
Appears in Collections:Chemistry Research Collection

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