Role of Re Species and Acid Cocatalyst on Ir-ReO_x/SiO₂in the C-O Hydrogenolysis of Biomass-Derived Substrates

Abstract

The catalytic performance of ReOx -modified Ir metal catalyst in the hydrogenolysis of C-O bonds is strongly dependent on the choice of solvent. The acidic property of the Re species becomes obvious in the alkane solvent, and the hydrogenolysis reaction proceeds mainly by acid-catalyzed dehydration and the subsequent metal-catalyzed hydrogenation. The acidic property of the Re species is weakened in water; however, the hydrogenolysis reaction proceeds in water via a direct mechanism involving SN 2-like attack of a hydride species at the interface between Ir and ReOx on the adsorbed Re alkoxide species. This mechanism enabled the selective dissociation of the C-O bond neighboring the CH2 OH group.

Influence of Impregnation Processes on Ruthenium–Molybdenum Carbon Catalysts for Selective Hydrodeoxygenation of Biomass‐Derived Sorbitol into Renewable Alkanes

“…On the basis of the experimental results and catalyst characterization, this process would ensure the higher coverage ratio of MoO x on the Ru surface or vicinity, which would enhance the efficiency of H 2 spillover and interaction between Ru and MoO x . According to the existing literature, the dehydration of polyol requires high reaction temperature, but it favors the C−C cracking by retro‐aldol reaction via dehydrogenation of the substrates, especially in the presence of Ru ,. Therefore, our finding is very important to help find an effective method to prepare effective Ru–MoO x /C catalysts to produce renewable alkanes and low C−C cracking products from biomass‐derived feedstocks.…”

Insights into the Ring‐Opening of Biomass‐Derived Furanics over Carbon‐Supported Ruthenium

“…Adsorbed hydrogen on metal sites then hydrogenates the intermediate to the final product. Another proposed role of the oxide species in the ring‐opening chemistry is to provide binding sites for oxygen‐containing side groups, and the hydrogenated furan ring is opened on adjacent metal sites . Therefore, results from the current study, along with previous work, suggest that the selective ring‐opening of furanic compounds is unlikely to occur on monometallic surfaces and requires more than multiple types of active sites.…”

Demethoxylation of guaiacol and methoxybenzenes over carbon-supported Ru–Mn catalyst

“…Hydrodeoxygenation is an effective way to transform biomassrelated compounds such as polyols [10][11][12], furans [13,14] and phenolics [15,16] into valuable compounds which have lower oxygen contents than biomass. Guaiacol is a simple lignin-derived monomer with three different C O bonds ((1) C aromatic -OH, (2) C aromatic -OC methyl , (3) C methyl -OC aromatic ; Fig.…”