Aqueous-phase deoxygenation of glycerol to 1,3-propanediol over Pt/WO3/ZrO2 catalysts in a fixed-bed reactor
2010; Royal Society of Chemistry; Volume: 12; Issue: 8 Linguagem: Inglês
10.1039/c0gc00005a
ISSN1463-9270
AutoresLi-Zhen Qin, Min-Jie Song, Changlin Chen,
Tópico(s)Catalytic Processes in Materials Science
ResumoDeoxygenation of glycerol in aqueous medium catalyzed by Pt/WO3/ZrO2 at relatively low temperatures (110–140 °C) under hydrogen pressure range from 2 to 5 MPa in a fixed-bed continuous-flow reactor gives 1,3-propanediol (1,3-PDO) and n-propanol (n-PrOH) as the predominant products, indicating high selectivity for deoxygenation of the secondary hydroxyl group over the primary hydroxyl groups of the glycerol. The optimum catalyst was prepared by calcination of WO3/ZrO2 at 700 °C and loading of 3.0 wt% Pt with W content of 10 wt%. The effect of reaction temperature, hydrogen pressure and initial water content were evaluated to find the optimum reaction conditions. The glycerol conversion and the yield of 1,3-PDO greatly depended on these factors. At 130 °C, 4 MPa and 70.2% conversion, the yield of 1,3-PDO was up to 32.0% (1,3-PDO/1,2-PDO = 17.7). The proposed mechanism for glycerol deoxygenation in aqueous medium over Pt/WO3/ZrO2 is an ionic pathway involving proton and hydride ion transfer steps.
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