Vapour phase hydrogenolysis of glycerol to propanediols over Cu/SBA‐15 catalysts

• Published in: Journal of chemical technology and biotechnology (1986) Vol. 90; no. 10; pp. 1906 - 1917
• Main Authors: Harisekhar, Mitta, Pavan Kumar, Vanama, Shanthi Priya, Samudrala, Chary, Komandur VR
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.10.2015; Wiley Subscription Services, Inc
• Subjects: acidic properties; acidity; ammonia; biotechnology; Catalysis; Catalysts; Copper; Copper oxides; Cu/SBA-15; cupric oxide; dispersion; Dispersions; feedstocks; fuels; Glycerol; glycerol hydrogenolysis; Glycerols; Hydrogenolysis; nitrous oxide; propanediols; sampling; vapors; Vapour; X-ray diffraction
• ISSN: 0268-2575; 1097-4660
• DOI: 10.1002/jctb.4728

BACKGROUND: Biomass‐derived glycerol is emerging as a renewable, cheap and versatile feedstock for the production of a variety of chemicals and fuels. RESULTS: Cu catalysts with varying copper loadings ranging from 2.5 to 20 wt% supported on SBA‐15 were investigated for the vapour phase hydrogenolysis of glycerol to propanediols. The dispersion of Cu and copper metal area on mesoporous SBA‐15 was determined by pulse N₂O decomposition measurements. The X‐ray diffraction patterns suggest that the presence of highly dispersed copper oxide species at lower Cu loadings (≤5Cu) and as crystalline CuO phase at higher Cu loadings (≥10 wt% Cu). The acidity of the catalysts measured by NH₃ ‐TPD method reveals that the acidity of the samples increases with increase of copper loading up to 5 wt% and decreases at higher copper loadings. The catalytic functionalities during the vapour phase hydrogenolysis of glycerol to propanediols are correlated with the copper oxide dispersion and also with the acidic properties CONCLUSIONS: In summary, 5Cu/SBA‐15 catalyst was found to consist of highly dispersed copper oxide on the support, evidenced by XRD, TPR and N₂O decomposition studies. This catalyst exhibits high glycerol conversion (90%) and 84% selectivity of 1,2‐propanediol. The activity results are well correlated with Cu dispersion and acidity of the catalysts. © 2015 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.