Selective oxidation of glucose to glucuronic acid by cesium-promoted gold nanoparticle catalyst

Autor(es)

Wojcieszak, Robert ; Cuccovia, Iolanda M. ; Silva, Marcia A. ; Rossi, Liane M.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL; v. 422, p. 8-pg., 2016-10-01.

Resumo

Gold catalysts outperform palladium and platinum catalysts for the oxidation of sugars with high activity and selectivity toward aldonic acids. The oxidation into other sugar acids, such as uronic and aldaric acids, has been scarcely investigated. Au nanoparticles supported on CeO2 using a soft chemical reduction method with hydrazine, were active for the selective oxidation of low weight carbohydrates (glucose, fructose, maltose) into glucuronic acid. The oxidation occurred in aqueous solution at low temperature using O-2 as oxidant and without adding any base. The activity was improved by modifying the supported Au catalyst with cesium, while selectivity was maintained. Under these conditions, high selectivity to glucuronic acid was achieved; however, in the presence of base many by-products were obtained. The preparation of glucuronic acid in high yield using gold catalysts was never reported, which makes the catalyst developed here very interesting for liquid phase oxidation processes. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/21566-0 - Estudo de catalisadores bimetálicos de ouro para conversão de carboidratos em produtos químicos bioderivados
• Beneficiário: Robert Jan Wojcieszak
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/08691-0 - Explorando a química do ouro e suas oportunidades únicas em catálise para conversão de biomassa em produtos químicos bioderivados
• Beneficiário: Liane Marcia Rossi
• Modalidade de apoio: Auxílio à Pesquisa - Regular