Solid acid co-catalyst for the hydrogenolysis of glycerol to 1,3-propanediol over Ir-ReOx/SiO2
Hydrogenolysis of aqueous glycerol was conducted with Ir-ReOx/SiO2 catalyst and solid acid co-catalyst. Considering the reusability and activity, H-ZSM-5 is the most suitable solid co-catalyst. The property of Ir-ReOx/SiO2 + H-ZSM-5 system including kinetics and selectivity trends in various reaction conditions is similar to the case of Ir-ReOx/SiO2 + H2SO4. The catalyst stability, activity, and the maximum yield of 1,3-PrD of Ir-ReOx/SiO2 + H-ZSM-5 were slightly lower than Ir-ReOx/SiO2 + H2SO4. The role of added acid may be to protonate the surface of ReOx cluster to increase the number of hydroxorhenium site, which activates glycerol by the formation of glyceride species.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (137 K)Download as PowerPoint slideHighlights► The combination of Ir-ReOx/SiO2 and solid acids catalyzes glycerol hydrogenolysis. ► Acid addition enhances hydrogenolysis of the internal COH bond of glycerol. ► Amberlyst 70 is the most effective solid acid in enhancing the activity. ► H-ZSM-5 is a suitable solid acid in terms of activity and reusability.
Journal: Applied Catalysis A: General - Volumes 433–434, 8 August 2012, Pages 128–134