Artigo De: orcid, cienciavitae, scopus
Biodiesel Glycerin Valorization into Oxygenated Fuel Additives
Catalysis Letters
— 2022
Informações chave
Autores:
Publicado em
01/02/2022
Resumo
Current industrial methods of biodiesel production lead to an excess of crude glycerin which requires costly purification before commercialization. Production of oxygenated fuel additives is a potential route for glycerin valorization. Glycerin acetylation was carried out over heterogeneous acid catalysts (15%, glycerol weight basis) using glacial acetic acid (molar ratio=9). The catalysts, containing different amounts of phosphate species (P/Si from 10 to 20 atomic ratio), were prepared by wet impregnation of commercial silica with aqueous solutions of diammonium phosphate and ortho-phosphoric acid. X-ray diffraction patterns of calcined solids presented amorphous patterns like raw silica. The prepared catalysts presented, at 120 degrees C, glycerol conversion higher than 89.5% after 1 h of reaction, been diacetin the major product, with triacetin selectivities lower than 26.1%. Diacetin selectivity was found to be almost invariant with catalyst acidity thus underlining the relevance of catalyst porosity due to the large acetins molecules sizes. The slow rate of triacetin diffusion in narrow pores of catalyst might be responsible for the relatively low yield obtained. Surface phosphate species showed a slow rate of leaching in the reaction medium showing high catalyst stability. [GRAPHICS] .
Detalhes da publicação
Autores da comunidade :
João Fernando Pereira Gomes
ist123818
Versão da publicação
AO - Versão original do autor
Título do contentor da publicação
Catalysis Letters
Primeira página ou número de artigo
513
Última página
522
Volume
152
Fascículo
2
ISSN
1011-372X
Domínio Científico (FOS)
chemical-engineering - Engenharia Química
Idioma da publicação (código ISO)
eng - Inglês
Identificador alternativo (URI)
https://doi.org/10.1007/s10562-021-03646-0
Acesso à publicação:
Acesso apenas a metadados