A porous activated carbon supported Pt catalyst for the oxidative degradation of poly[(naphthaleneformaldehyde)sulfonate]

Karthikeyan, S, Jo, W, Dhanalakshmi, R, Isaacs, M, Wilson, K, Sekaran, G and Lee, A 2018, 'A porous activated carbon supported Pt catalyst for the oxidative degradation of poly[(naphthaleneformaldehyde)sulfonate]', Journal of the Taiwan Institute of Chemical Engineers, vol. 93, pp. 289-297.


Document type: Journal Article
Collection: Journal Articles

Title A porous activated carbon supported Pt catalyst for the oxidative degradation of poly[(naphthaleneformaldehyde)sulfonate]
Author(s) Karthikeyan, S
Jo, W
Dhanalakshmi, R
Isaacs, M
Wilson, K
Sekaran, G
Lee, A
Year 2018
Journal name Journal of the Taiwan Institute of Chemical Engineers
Volume number 93
Start page 289
End page 297
Total pages 9
Publisher Elsevier BV
Abstract Wet catalytic oxidation of sodium poly[(naphthaleneformaldehyde)sulfonate], a hazardous contaminant of wastewater streams from the textiles industry, by hydrogen peroxide under ambient conditions was explored over platinum supported on a porous activated carbon (PAC). Bulk and surface properties of the Pt/PAC catalyst were investigated by XRD, XPS, SEM, TEM, FTIR, EPR and thermogravimetric analysis. The parent PAC, derived from pyrolysis and subsequent activation of rice husks, exhibited significant micro- and mesoporosity, and a high degree of surface oxidation. Incorporation of 1.7 wt% Pt resulted in mesopore blockage, and a corresponding drop in surface area, associated with the formation of large ∼8 nm metallic nanoparticles. Poly[(naphthaleneformaldehyde)sulfonate] oxidative degradation was studied as a function of reactant concentration and solution pH, revealing first order decomposition kinetics and good activity over pH 39 at ambient temperature. Electron Paramagnetic Resonance (EPR)-DMPO spin trapping experiments confirm that oxidation of the organic pollutant proceeded via hydroxyl radical generation. The 1.7 wt% Pt/PAC catalyst showed excellent catalyst stability for five consecutive runs over 25 h in a fluidised bed reactor, delivering > 85% removal of 100 mg/L sulfonate with negligible Pt leaching or activity loss, and comparable performance for treatment of a real tannery effluent stream with a COD equivalent of 1860 mg/L.
Subject Chemical Engineering not elsewhere classified
Catalytic Process Engineering
Catalysis and Mechanisms of Reactions
Keyword(s) EPR
Naphthalene sulfonate
Oxidation
Platinum
Porous carbon
DOI - identifier 10.1016/j.jtice.2018.07.028
Copyright notice © 2018 Taiwan Institute of Chemical Engineers
ISSN 1876-1070
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