Aqueous-Phase Hydrogenolysis of Glycerol over Re Promoted Ru Catalysts Encapuslated in Porous Silica Nanoparticles
Department of Chemical Engineering, Tunghai University, 40704 Taichung, Taiwan
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Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(3), 153; https://doi.org/10.3390/nano8030153
Received: 5 February 2018
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Revised: 5 March 2018
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Accepted: 7 March 2018
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Published: 9 March 2018
(This article belongs to the Special Issue Sustainable Nanoparticles - Their Synthesis and Catalytic Applications)
Activity improvement of Ru-based catalysts is needed for efficient production of valuable chemicals from glycerol hydrogenolysis. In this work, a series of Re promoted Ru catalysts encapuslated in porous silica nanoparticles (denoted as [email protected]2) were prepared by coating silica onto the surface of chemically reduced Ru-polyvinylpyrrolidone colloids, and were used to catalyze the conversion of glycerol to diols and alcohols in water. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption, X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR) were used to characterize these nanoparticles. Effects of Ru/Si atomic ratio, Re addition, glycerol and catalyst concentrations, reaction time, temperature, and hydrogen pressure were investigated. Re addition retarded the reduction of ruthenium oxide, but increased the catalyst reactivity for glycerol hydrogenolysis. Due to its greater Ru content, [email protected] SiO2 showed much better activity (reacted at much lower temperature) and more yields of 1,2-propanediol and overall liquid-phase products than Re-Ru/SiO2 (prepared by conventional impregnation method) reported before. The rate of glycerol disappearance exhibited first-order dependence on glycerol concentration and hydrogen pressure, with an activation energy of 107.8 kJ/mol. The rate constant increased linearly with increasing Ru/Si atomic ratio and catalyst amount. The yield of overall liquid-phase products correlated well with glycerol conversion.
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Keywords:
[email protected]2 nanoparticles; glycerol hydrogenolysis; 1,2-propanediol; 1,3-propanediol; diols; alcohols
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MDPI and ACS Style
Li, K.-T.; Yen, R.-H. Aqueous-Phase Hydrogenolysis of Glycerol over Re Promoted Ru Catalysts Encapuslated in Porous Silica Nanoparticles. Nanomaterials 2018, 8, 153. https://doi.org/10.3390/nano8030153
AMA Style
Li K-T, Yen R-H. Aqueous-Phase Hydrogenolysis of Glycerol over Re Promoted Ru Catalysts Encapuslated in Porous Silica Nanoparticles. Nanomaterials. 2018; 8(3):153. https://doi.org/10.3390/nano8030153
Chicago/Turabian StyleLi, Kuo-Tseng, and Ruey-Hsiang Yen. 2018. "Aqueous-Phase Hydrogenolysis of Glycerol over Re Promoted Ru Catalysts Encapuslated in Porous Silica Nanoparticles" Nanomaterials 8, no. 3: 153. https://doi.org/10.3390/nano8030153
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