Aqueous phase reforming of glycerol to 1,3-propanediol using noble metal doped Ni/CeO2

Abstract

1,3-Propanediol, a vital compound with wide industrial applications, holds promise as a key product derived from aqueous phase reforming and in-situ glycerol hydrogenolysis. In this study, we are investigating the potential impact of noble metal (Ir, Pd, and Ru) doping on Ni/CeO₂ catalysts, aiming to uncover the mechanisms responsible for enhanced reaction kinetics and catalytic performance. Our investigation thoroughly explores the physicochemical properties of the catalysts, utilizing many analytical techniques including FESEM-EDX, TEM, H₂-TPR, NH₃-TPD, BET, XRD, XPS, and ICP-OES. Within the controlled environment of our autoclave batch reactor, operating specifications of 20 % glycerol, 20 bar, and 230 °C are carefully maintained during the 3 h evaluation period. Among the synthesized catalysts, Pd-doped Ni/CeO₂ stands out as the leading candidate, demonstrating superior physicochemical properties and catalytic effectiveness. Glycerol conversion rates soar up to 86.66 %, with 1,3-propanediol yields reaching 31.77 %. The kinetics reveal a compelling narrative of first-order reactions, supported by a modified Arrhenius equation featuring an activation energy of 12.203 kJ/mol and an R² value of 0.947. This research marks a breakthrough in cost-effective, high-yielding glycerol transformation, signaling a notable shift in industrial catalysis. Noble metal-doped Ni catalysts are set to redefine traditional processes.