Influence of acid sites on the hydrodeoxygenation of anisole with metal supported on SBA-15 and SAPO-11. (April 2018)

• Record Type: Journal Article
• Authors: Hewer, Thiago L.R.; Souza, Adriana G.F.; Roseno, Karina T.C.; Moreira, Paulo F.; Bonfim, Rodrigo; Alves, Rita M.B.; Schmal, Martin
• Is Part Of: Renewable energy. Volume 119(2018)
• Page Start: 615
• Page End: 624
• Publication Date: 2018-04
• Subjects: Deoxygenation -- Anisole -- SBA-15 -- SAPO-11 -- Acidity -- Ni-Mo; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2017.12.044
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: Nickel and molybdenum nanoparticles were prepared on silicon aluminum phosphate (SAPO-11) and mesoporous silica (SBA-15), respectively, and compared with γ-Al2 O3 support. Results showed that the nickel and molybdenum nanoparticles were located inside the pores of the SBA-15 structure with particles sizes around 7 nm. However, for the SAPO-11 support the nanoparticles are dispersed outside the support surface. These catalysts were tested for hydrodeoxygenation (HDO) and exhibited excellent catalytic activity. The catalytic reaction had been carried out in a fixed bed flow reactor at 200–300 °C. It is noteworthy that the Turnover Frequencies (TOF) obtained for of NiMoSAPO was 2 times greater than NiMoSBA-15 catalyst. The products formed on NiMoSAPO and NiMoSBA were completely different from the NiMoAl2 O3 catalyst used as reference. IR of Pyridine suggested that the hydrodeoxygenation and hydrodearomatization reaction is strongly affected by the support nature, specifically, due to the relation between Brönsted and Lewis acid sites present at the surface of these materials. The low surface area, dispersion of the metallic sites and the proportion of Lewis/Brönsted acid sites have had strong influence on the selectivity of the hydrodeoxygenation reaction. Graphical abstract: Highlights: Lewis sites of supports influence the activity and selectivity of the anisole hydrodeoxygenation. The SBA-15 and SAPO-11 present different acid site strength affecting the activity. The hydrodeoxygenation and hydrodearomatization depend on the metal and acid sites. The Lewis/Brönsted sites ratio affects the product selectivity and reaction mechanism.