Promoting effect of Ru in the Pt-Ru/WO x /Al 2 O 3 catalyst for the selective hydrogenolysis of glycerol to 1,3-propaned
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Promoting effect of Ru in the Pt‑Ru/WOx/Al2O3 catalyst for the selective hydrogenolysis of glycerol to 1,3‑propanediol Yinglin Wen1 · Weihua Shen1 · Yang Li1 · Yunjin Fang1 Received: 7 September 2020 / Accepted: 19 November 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract In this paper, the effect of Ru in the catalyst of Pt/WOx/Al2O3 on glycerol hydrogenolysis to 1,3-propanediol was studied. The 1 wt% Ru-added 2Pt/WOx/Al2O3 catalyst with 2 wt% Pt content demonstrated high activity for the hydrogenolysis of glycerol to 1,3-propanediol compared to Pt/WOx/Al2O3. The conversion of glycerol over 2Pt-1Ru/WOx/Al2O3 catalyst was 90.4%, while that of 2Pt/WOx/Al2O3 catalyst was 69.7%. The catalytic activity of 2Pt-1Ru/WOx/Al2O3 was systematically investigated under various reaction conditions, including reaction time, temperature and hydrogen pressure, to optimize the reaction conditions. Based on various characterizations, Pt-Ru particles are finely dispersed on the support of WOx/Al2O3. Compared with the Pt particle size, which was 0.5 to 1.97 nm before and after the catalyst reaction, respectively, the Pt-Ru particle size was 0.67 to 1.37 nm. This phenomenon revealed that the Ru additive could restrain the condensation of metal particles. Meanwhile, it also be found that the Ru additive is favor to the redox cycle of W6+ ↔ W5+, enhance the adsorption capability of hydrogen and increase the amount of medium strength acid sites and Brønsted acidic sites in catalyst. Keywords Ruthenium · Platinum · Tungsten oxide · 1,3-propanediol · Glycerol · Hydrogenolysis
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s1114 4-020-01908-3) contains supplementary material, which is available to authorized users. * Yunjin Fang [email protected] 1
State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
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Reaction Kinetics, Mechanisms and Catalysis
Introduction Glycerol is the main byproduct during the process of biodiesel production. Based on the investigation, approximately 1 kg of crude glycerol is generated for every 9 kg of biodiesel [1]. In recent decades, with the continuous decline of the market price of glycerol, extensive attention has been given to increase the added value of glycerol through chemical conversions [2–5]. 1,3-Propanediol (1,3-PDO) is considered to be a promising and desirable target because of its versatile applications, especially as an essential monomer in the production of polymethylene terephthalate [2, 5, 6]. Currently, 1,3-PDO is mainly manufactured from petroleum derivatives (including ethylene oxide and acrolein) or by biotechnology methods. Meanwhile, a more renewable and economical route can be produced via glycerol hydrogenolysis [7]. Therefore, glycerol hydrogenolysis to 1,3-PDO is a cost-effective method. A suitable catalyst is critical in glycerol hydrogenolysis to 1,3-PDO. Some bifunctional catal
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