Selective Production of Methane from Aqueous Biocarbohydrate Streams over a Mixture of Platinum and Ruthenium Catalysts

A one‐step process for the selective production of methane from low‐value aqueous carbohydrate streams is proposed. Sorbitol, used herein as a model compound, is fully converted to methane, CO 2 , and a minor amount of H 2 by using a physical mixture of Pt and Ru (1:5 in mass basis) at 220 °C and 35 bar. This conversion is the result of hydrogenolysis of part of the sorbitol over Ru and the in situ production of H 2 through the aqueous‐phase reforming of the remaining carbohydrate over Pt. A synergistic effect of the combination of these two catalysts results in the rapid and highly selective conversion of the carbohydrate to methane. This process offers the possibility of upgrading a low‐value carbohydrate stream into a valuable fuel with no addition of H 2 . Exergy analysis reveals that nearly 80 % of the exergy of the reactant is recovered as methane.