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Electro-oxidation of waste glycerol to tartronic acid over Pt/CNT nanocatalyst: study of effect of reaction time on product distribution

Ahmad, M. S. and Cheng, C. K. and Ong, Huei Ruey and Hamidah, Abdullah and Hong, Chi Shein and Chua, Gek Kee and Mishra, Puranjan and Khan, Maksudur R. (2019) Electro-oxidation of waste glycerol to tartronic acid over Pt/CNT nanocatalyst: study of effect of reaction time on product distribution. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects. pp. 1-18. ISSN 1556-7036 (Print); 1556-7230 (Online) (In Press)

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Abstract

In this work, glycerol valorization into tartronic acid – one of the most valuable derivatives of glycerol – was reported over platinum supported on multi-walled carbon nanotubes (Pt/CNT) electrocatalyst. The nanocatalyst was synthesized using a chemical reduction method with hydrazine as a reducing agent. The physical analyses of catalyst were performed by BET, XRD, FESEM, EDX, and TEM. The XRD spectroscopy indicated a face-centered cubic crystalline structure with an average crystallite size of 4.2 nm. The field emission scanning electron microscopy analysis revealed that the particles were uniformly distributed over multi-walled carbon nanotubes, while EDX showed the elemental composition of Pt (17.52%) and C (82.48%). Electrochemical activity and stability of the catalyst were measured using cyclic voltammetry and chronoamperometry techniques. Electrochemical surface area (ECSA, 226.52 m2/g) and mass activity (MA, 5.74 mA/mg) were calculated in 0.5 M H2SO4 and 0.5 M glycerol/0.5 M KOH solution, respectively. The catalytic activity of Pt/CNT nanoparticles was analyzed from glycerol oxidation reaction (GOR), while the products distribution and selectivity were measured using high-performance liquid chromatography (HPLC). It was found that the tartronic acid was produced as a major product with a selectivity of 95.3% while small quantities (<1%) of mesoxalic acid, dihydroxyacetone, and glyceric acid were also produced. The higher activity and selectivity of Pt/CNT can be attributed to high electrochemical surface area and uniform distribution over support.

Item Type: Article
Uncontrolled Keywords: Electrochemical surface area, glycerol oxidation reaction, HPLC, Pt/CNT, tartronic acid
Subjects: T Technology > TP Chemical technology
Faculty/Division: Faculty of Chemical & Natural Resources Engineering
Faculty of Engineering Technology
Institute of Postgraduate Studies
Depositing User: Noorul Farina Arifin
Date Deposited: 28 Jan 2020 03:25
Last Modified: 29 Jan 2020 01:28
URI: http://umpir.ump.edu.my/id/eprint/27577
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