Unveiling the effect of metallic and oxidized phases of cobalt on acetone hydrodeoxygenation

Autor(es)

Leite, Davi S. ; Strapasson, Guilherme B. ; Zanchet, Daniela

• Tipo de documento: Artigo Científico
• Fonte: MOLECULAR CATALYSIS; v. 530, p. 9-pg., 2022-09-01.

Resumo

The impact of metallic and oxidized phases of cobalt and the nature of different catalytic sites in the gas-phase acetone hydrodeoxygenation were evaluated using Co3O4 nanopowder as catalyst. Mild pretreatments (reduction/oxidation up to 400 degrees C) were performed to vary the oxidation degree of the catalyst, aiming to favor the selective C-O bond cleavage. We found that the Co3O4 nanopowder was not able to deoxygenate acetone at 200 degrees C, even by halving the acetone weight hourly space velocity (WHSV). At this temperature, only products of hydrogenation (isopropanol) and condensation (mesityl oxide) were obtained. A different selectivity was achieved by the pretreated catalysts. Methane formation was enhanced in the prereduced catalyst whereas isopropanol was the favored product after reoxidizing the catalyst at 400 degrees C. The best compromise was achieved when the prereduced catalyst was calcined at a lower temperature, 200 degrees C, achieving about 1:1 C-C: C-O bond cleavage ratio. The results pointed out the nature of different catalytic sites, and their correlation with the reaction pathways was proposed. (AU)

• Processo FAPESP: 20/12986-1 - Design de catalisadores de níquel suportados em nanoestruturas 1D à base de TiO2/Nb2O5
• Beneficiário: Guilherme Boenny Strapasson
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 18/01258-5 - Novos processos catalíticos e fotocatalíticos para a conversão direta de metano e CO2 em produtos
• Beneficiário: José Maria Correa Bueno
• Modalidade de apoio: Auxílio à Pesquisa - Temático