Enhanced recycling performance of bimetallic Ir-Re/SiO2 catalyst by amberlyst-15 for glycerol hydrogenolysis

Rhenium in Heterogeneous Catalysis: A Rising Star for Hydrogenation Reactions

“…19 An excessive surface monolayer encapsulation influences or even suppresses the adsorption/activation of different organic reactants. Ren et al 32 suggested that the coverage of ReO x on In recent studies, sulfides were frequently reported for the hydrogenation of the sulfur compound. ReS 2 was also reported as one of the potential candidates with nice catalytic performances, which could be obtained via either ex-situ sulfidation by sulfosalts/thiol during synthesis or in-situ function during the reaction.…”

“…An excessive surface monolayer encapsulation influences or even suppresses the adsorption/activation of different organic reactants. Ren et al suggested that the coverage of ReO x on and next to Ir sites limited the formation of active Re–OH species with the reactant-glycerol (Figure ), leading to the irreversible deactivation. The coaddition of a solid acid- amberlyst-15 mixed in the reactants helped to modify the functional environment of the Ir–Re catalyst.…”

“…Researchers utilized a special setup to avoid the exposure of Re to air during reaction cycles and to keep the reusability of Re-based catalysts . Other research work also focused on the fixing of Re by constructing a specific interaction or by changing the functional environment of Re . Our previous studies discovered that the bimetallic Ir–Re/SiO 2 system was highly efficient for many catalytic processes including the hydrogenation of glycerol, 1,6-hexanediol, succinic acid, etc. , However, Re sites in the Ir–Re/SiO 2 catalyst underwent irreversible segregation and oxidation if the powder was improperly exposed to air without prepassivation.…”

“…Schematic of the changes in the structure of the Ir–Re/SiO 2 catalyst during the sequential reaction processes (a) without and (b) with adding amberlyst-15, where the blue, yellow, and red balls represent Ir, Re, and ReO x species, respectively. Reproduced or adapted with permission from ref . Copyright 2022 Chemical Industry Press.…”