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Catalysis in Green Chemistry and Engineering

ISSN Druckformat: 2572-9896
ISSN Online: 2572-990X

Catalysis in Green Chemistry and Engineering

DOI: 10.1615/.2017022143
pages 65-77

WET AIR OXIDATION OF BISPHENOL-A, ISOPHORONE, p-HYDROXYBENZOIC ACID, AND p-TOLUIDINE OVER AN Ru/C CATALYST

Shrikant Y. Vemula
Department of Chemical Engineering, Institute of Chemical Technology, Nathalal Parekh Marg, Matunga, Mumbai-400019, India
Prakash D. Vaidya
Department of Chemical Engineering, Institute of Chemical Technology, Nathalal Parekh Marg, Matunga, Mumbai-400019, India

ABSTRAKT

Wet oxidation is a candidate wastewater-treatment technique, especially suitable when biological oxidation and incineration are inappropriate. In the present study, we investigate subcritical wet air oxidation (WAO) and catalytic WAO (CWAO) of four model compounds bearing different functional groups. Bisphenol-A, p-hydroxybenzoic acid, isophorone, and p-toluidine were the four chosen substrates representing classes of compounds phenols, carboxylic acids, ketones, and amines, respectively. Temperature and pressure were varied in the 423–473-K and 0.69–2.07-MPa ranges. A heterogeneous 5% Ru/C catalyst was used for CWAO. This catalyst was characterized using scanning electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller analysis, and H2 chemisorption methods. The performance of Ru/C for oxidative destruction of total organic carbon (TOC) was encouraging. Using TOC versus time data collected in the slurry reactor, kinetics of the reaction with isophorone were described using heterogeneous power law and Langmuir–Hinshelwood-type kinetic models. Our research has the potential to aid environmental engineers in effectively treating contaminated wastewater by WAO.


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