Enhanced activity of Ru/TiO2 catalyst using bisupport, bentonite-TiO2 for hydrogenolysis of glycerol in aqueous media

Noraini Hamzah, and Norasikin Mohamad Nordin, and Ainol Hayah Ahmad Nadzri, and Yah Awg Nik, and Mohamad Kassim, and Mohd Ambar Yarmo, (2012) Enhanced activity of Ru/TiO2 catalyst using bisupport, bentonite-TiO2 for hydrogenolysis of glycerol in aqueous media. Applied Catalysis A : General . ISSN 0923 -860X

Abstract

A combination of bentonite-TiO2 was used as support to enhance the activity of Ru/TiO2 catalyst in hydrogenolysis of aqueous glycerol to 1,2-propanediol. A series of bentonite, TiO2, SiO2 and Al2O3 supported Ru catalyst were fabricated and characterized by XRD, XPS, BET, FESEM-EDX and TEM to establish some physicochemical properties of the catalysts. The activity of the catalysts was tested in glycerol hydrogenolysis reaction and were found to be in the following increasing order: Ru/SiO2 < Ru/TiO2 ≈ Ru/Al2O3 < Ru/bentonite. In particular, Ru/bentonite catalyst recorded the highest conversion (62.8%) of glycerol (20 wt%) with 80.1% selectivity to 1,2-pronediol at 150 ◦C, 20–30 bar H2 with a reaction duration of 7 h. The Ru/TiO2 catalyst exhibited the highest selectivity (83.7%) for hydrogenolysis of glycerol to 1,2-propanediol and with 38.8% conversion only. The activity of Ru/TiO2 catalyst was enhanced by adding bentonite to the titania support at 1:2 ratio resulting in an 80% increasing the activity from 38.8% to 69.8% under the same optimum condition for Ru/TiO2 while maintaining an 80% selectivity to 1,2-propanediol. TPD-NH3 analysis found that mixed support could increase catalyst acidity. CO pulse chemisorption analysis revealed that Ru particles was well dispersed with the smallest average size particles (1.5 nm) which could contribute to high activity of Ru/TiO2 catalyst for hydrogenolysis of glycerol

Item Type: Non-Indexed Article
Keywords: Hydrogenolysis - Glycerol - Bentonite-TiO2 - Ruthenium catalyst - Ruthenium catalyst
Faculty: Centre for Modern Languages and Generic Development
Deposited By: En. Pahmi Abdullah
Date Deposited: 10 Jun 2012 16:57
Last Modified: 07 Dec 2014 01:32
URI: http://umkeprints.umk.edu.my/id/eprint/441

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