Synthesis of selected aromatic aldehydes under UV-LED irradiation over a hybrid photocatalyst of carbon nanofibers and zinc oxide

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Raquel A. Fernandes (Autor) Outra; Maria J. Sampaio (Autor) FEUP; Eliana S. da Silva (Autor) FEUP; Philippe Serp (Autor) Outra; Joaquim L. Faria (Autor) FEUP; Cláudia G. Silva (Autor) FEUP

Revista

Título: Catalysis Today

Vol. 328 Nº SI

Páginas: 286-292

ISSN: 0920-5861

Editora: Elsevier

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 11 Citações

Projetos Associados

LED-NETmix - LED-NETmix: um fotoreator inovador para a intensificação de processos em síntese química

IF/00514/2014/CP1249/CT0004 - Desafiando a síntese em química fina: uma nova abordagem utilizando fotocatalisadores isentos de metais

Outras Informações

ID Authenticus: P-00P-VP5

DOI: 10.1016/j.cattod.2018.10.061

Abstract (EN): Zinc oxide (ZnO) prepared by chemical vapor deposition was combined with different amounts of carbon nanofibers (CNF) to obtain hybrid materials, which were thoroughly characterized using several techniques. The photocatalytic performance was evaluated towards the photocatalytic synthesis of vanillin (VAD) starting from vanillyl alcohol (VA). The incorporation of the carbon phase in ZnO (from 5% to 20% wt.) was found to increase the surface area and the photocatalytic performance of the materials. The latter was attributed to the efficient separation of charge carriers generated on the optical semiconductor. With the best performing material, the one containing 10% of CNF, the selectivity of the synthesis towards vanillin generation was increased by a factor of 2.5 compared to previous studies, with the additional advantage of carrying the reaction in aqueous medium. The same photocatalyst was successfully applied to the selective synthesis of other aromatic aldehydes, namely anisaldehyde, piperonal, and benzaldehyde. A relationship between the efficiency of the photocatalytic oxidation of the alcohols and the activating nature of their aromatic ring substituents was proposed.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7