Selective production of formic acid from aqueous phase bio-oil by catalytic oxidation using heteropoly acids (for bio-oil hydrodeoxygenation)

ESCOBAR, M.;ROMERO, R.;SEGURA, C.; MÜLLER, N.:
3er Congreso Iberoamericano sobre Biorrefinerías (CIAB), 4to Congreso Latinoamericano sobre Biorrefinerías y 2do Simposio Internacional sobre Materiales Lignocelulósicos. Abstract book pp 72-73 (2015).

Abstract

In this work we show that catalytic oxidation of aqueous phase bio-oil with molecular oxygen and a Keggin-type polyoxometalate (H5PV2Mo10O40) produces formic acid with high selectivity. Bio-oil was obtained from sawdust (pinus radiata, size of 1-3 mm, moisture content of 9.1% on dry-basis), in a fast pyrolysis pilot plant using a fluidized bed of quartz sand at 530°C. The main aqueous-soluble compounds detected in 100 g of bio-oil were: 5.98 g of glycolaldehyde, 3.58 g of levoglucosan, 2.26 g of acetol, 1.39 g of acetic acid and 1.06 g of formic acid. The catalytic oxidation of the aqueous phase bio-oil was conducted at 90°C under 30 bar O2 for 7h and produced 13.27 g of formic acid per 100 g of bio-oil. The process uses air or molecular oxygen as a cheap and green oxidant. The enriched product in formic acid will be used as H-donor for bio-oil hydrodeoxygenation at mild conditions.

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