Orateur
Description
The Hydrogenation of biomass-derived 5-hydroxymethylfurfural is a complex multi-step reaction and the selectivity toward the desired product is the main issue to be solved. In this study, novel non-precious CuCoOx-CuNi/ γ-Al2O3-AlOOH catalysts were developed by using one stage pseudo incipient wetness impregnation methods under controlled reduction temperature for selective hydrogenation of 5-hydroxymethylfurfural (HMF) to liquid fuel 2,5-dimethylfuran (DMF). The study explored the relationship between the catalyst structure and the catalyst performance through catalyst characterizations by using XRD, TEM, SAED, BET,H2-TPR, NH3-TPD. H2-TPR confirmed the improvement of metal-metal and metal-support interaction resulting from the formation of boehmites species. NH3-TPD evidenced that the distribution of acids sites on the surface of catalyst depend on the reduction temperature and these acid sites strongly influence the distribution of products into the reaction system.
100% HMF conversion and 93.6% DMF yield were achieved over 500 °C reduced 5CuCo8-5Cu4Ni 0.5 / γ-Al2O3-AlOOH catalyst under 150 °C and 8 h, due to the synergy between bimetal Cu-Ni species and CoOx species. When the reaction temperature was below 130 °C, DMF was not produced. HMF hydrogenation over synthesized catalysts occurred following one reaction path; metal sites act for hydrogenation of the C=O bond in HMF and dissociation of H2 molecules while CoOx species act for hydrogenlysis of the C-O bond in BHMF and MFA. The recyclability test showed that the original DMF yield could be maintained 3times but it is still above 90% after 6 reuses.
The findings of this study showed that CuCoOx-CuNi/ γ-Al2O3-AlOOH catalyst is a good candidate for Biomass conversion into high value biochemicals
KEY WORDS: CuCoOx-CuNi/ γ-Al2O3-AlOOH catalyst, Biomass, 5-hydroxymethylfuran, 2,5-dimethylfuran, Hydrogenation, Hydrogenolysis
