Benzaldehyde and benzoic acid are high-value aromatic chemicals and important intermediates
in chemical industry, and the catalytic conversion of biomass-based sources to these aromatic
chemicals is of great significance in both academic and industrial fields. This work demonstrated that
bio-oil was directionally converted into benzaldehyde and benzoic acid by three-step process under
atmospheric pressure and moderate temperatures. The process included the catalytic cracking of biooil
into aromatics over 1% Ga/HZSM-5 catalyst, followed by the dealkylation of heavier alkylaromatics
to toluene over Re/HY catalyst and the liquid-phase oxidation of toluene-rich aromatics to the targeted
chemicals over CoCl2/NHPI (CoCl2/N-Hydroxyphthalimide) catalyst. The production of benzaldehyde
and benzoic acid from the bio-oil-derived aromatics, with the overall selectivity of 86.8%, was
achieved using CoCl2/NHPI catalyst at 100 °C. Furthermore, adding a small amount of methanol into
the feed would efficiently suppress the coke formation, and thus, enhance the yield of aromatics. Potentially,
the novel synthesis route offers a green way for the production of higher value-added aromatic
chemicals using renewable and environmentally friendly biomass-based sources.
Keywords: Biomass, pyrolysis, bio-oil, benzaldehyde, benzoic acid, catalytic cracking, dealkylation, oxidation.
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Losada, J.P.; Heckl, I.; Bertok, B.; Friedler, F.; Garcia-Ojeda, J.C.; Argoti, A. Process network synthesis for benzaldehyde production: P-graph approach. Chem. Eng. Trans., 2015, 45, 1369-1374.
Genuino, H.C.; Suib, S.L. Gas-phase total oxidation of benzene, toluene, ethylbenzene, and xylenes using shape-selective manganese oxide and copper manganese oxide catalysts; Abstr. Pap. Am. Chem. S., 2012, p. 244.
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