Reusable Heterogeneous Tungstophosphoric Acid-Derived Catalyst for Green Esterification of Carboxylic Acids

Autor(es)

Fiorio, Jhonatan Luiz ^{[1, 2]} ; Braga, Adriano Henrique ^[1] ; Barbosa Guedes, Carmen Luisa ^[2] ; Rossi, Liane Marcia ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Estadual Londrina, Dept Quim, Ctr Ciencias Exatas, BR-86057970 Londrina, PR - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACS SUSTAINABLE CHEMISTRY & ENGINEERING; v. 7, n. 19, p. 15874-15883, OCT 7 2019.
• Citações Web of Science: 0

Resumo

Solid acid catalysts are environmentally friendly alternatives to the use of mineral acids in a range of applications, including the esterification of carboxylic acids. Here, a phosphorus- and nitrogen-doped, carbon-modified, fully heterogeneous solid acid catalyst was prepared by pyrolysis of a mixture of melamine and tungstophosphoric acid at 250, 500, and 750 degrees C under a nitrogen atmosphere provided. The structure of the different catalysts was evaluated by surface area measurements, XRD, XPS, Raman spectroscopy, elemental analysis, and electron microscopies. Pyrolysis at 500 degrees C created complex solid materials with larger surface area and significantly higher acidity, which can be attributed to WO3 formation on a heteroatomic (N,P)-carbon structure. The 500 degrees C-treated heterogeneous catalysts showed remarkably better activity for esterification of palmitic acid and were thus applied in the esterification of a broad range of carboxylic acids with good overall yields. Furthermore, the solid acid catalyst can be easily recovered and recycled up to eight times without significant loss of activity with no leaching of species to the reaction mixture. (AU)

• Processo FAPESP: 16/16738-7 - Estudo da influência de ligantes orgânicos sobre a reatividade de nanopartículas de ouro
• Beneficiário: Liane Marcia Rossi
• Modalidade de apoio: Auxílio à Pesquisa - Regular