Solvent-Free Aerobic Oxidative Cleavage of Methyl Oleate to Biobased Aldehydes over Mechanochemically Synthesized Supported AgAu Nanoparticles

Author(s)

da Silva, Rafael T. P. ; Silva, Dagoberto O. ; de Oliveira, Paulo F. M. ; Bellabarba, Ronan ; Johnston, Peter ; Smit, Joost ; Holt, Jarle ; Betham, Michael ; Rossi, Liane M.

• Document type: Journal article
• Source: CHEMPLUSCHEM; v. N/A, p. 12-pg., 2023-08-16.

Abstract

The performance of mechanochemically synthesized supported bimetallic AgAu nanoalloy catalysts was evaluated in the oxidative cleavage of methyl oleate, a commonly available unsaturated bio-derived raw material. An extensive screening of supports (SiO2, C, ZrO2, Al2O3), metallic ratios (Ag : Au), reaction times, temperatures, and use of solvents was carried out. The performance was optimized towards productivity and selectivity for the primary cleavage products (aldehydes and oxoesters). The optimal conditions were achieved in the absence of solvent, using Ag8Au92/SiO2 as catalyst, at 80 & DEG;C, reaction time of 1 h, substrate to catalyst=555 and 10 bar of molecular oxygen. A strong support effect was observed: the selectivity to aldehydes was best with silica as support, and to esters was best using zirconia. This shows not only that mechanochemical preparation of bimetallic catalysts is a powerful tool to generate useful catalyst compositions, but also that a safe, green, solventless synthesis of bio-derived products can be achieved by aerobic oxidative cleavage. (AU)

• FAPESP's process: 20/14955-6 - Designing the next generation of advanced multicomponent materials through mechanochemical synthesis
• Grantee: Paulo Filho Marques de Oliveira
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 21/00675-4 - Tying up materials for electrochemical energy storage and catalysis
• Grantee: Roberto Manuel Torresi
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 21/12899-4 - Designing the next generation of advanced multicomponent materials through mechanochemical synthesis
• Grantee: Paulo Filho Marques de Oliveira
• Support Opportunities: Scholarships in Brazil - Young Researchers