Abstract
AbstractSugarcane straw is an important agricultural residue in the ethanol industry. In this work, an activated carbon with high surface area was prepared by activating this straw with H3PO4 (CP) and used as support for Ru catalysts. A commercial activated carbon (CA) was used for comparison. Ru/activated carbons were prepared using RuCl3 (RuCAC) and Ru(NO)(NO3)3 (RuCAN, RuCPN) and characterized by textural analysis, XRF, Boehm titration, pyridine FTIR, TPD−He, TPR, H2‐chemisorption, SEM and TEM. The catalysts were tested in the glycerol hydrogenolysis under different conditions of T, P and glycerol concentration. In the standard condition, 200 °C, 50 bar and 10 vol % glycerol (GLY), the activity was strongly influenced by the availability of Ru sites on the catalysts surface and acidity following the order RuCPN>RuCAC>RuCAN. Ethylene glycol (EG) formation in RuCAC and RuCPN catalysts was related to metallic sites instead of acidic sites. The formation of 1,2‐propanediol (1,2PD) instead of 1,3‐propanediol was ascribed to predominance of Lewis sites. Reactions with GLY, 1,2PD and EG allowed to propose a reaction scheme comprising the formation of intermediates.
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