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Catalytic wet oxidation of ferulic acid (a lignin model compound) in the presence of non-noble metal based catalysts at mild conditions

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Title Catalytic wet oxidation of ferulic acid (a lignin model compound) in the presence of non-noble metal based catalysts at mild conditions
 
Creator YADAV, BR
GARG, A
 
Subject Catalytic wet oxidation
Catalyst reusability
Ferulic acid
Heterogeneous catalysts
Reaction kinetics
ALUMINA NANOCOMPOSITE
AIR OXIDATION
WASTE-WATER
PAPER
PULP
DEGRADATION
EFFLUENT
REMOVAL
LIQUOR
 
Description The present study investigated the performance of activated carbon and alumina supported non-noble metal based catalysts during the catalytic wet oxidation (CWO) of ferulic acid (a lignin model compound). The heterogeneous catalysts, Cu/Ce/AC, Cu/Ce/Al2O3, Cu/Mn/AC and Cu/Mn/Al2O3 (mass ratio = 3:3:4), were prepared by metal impregnation while Cu/Mn/Ce (mass ratio = 3:3:4) catalyst was synthesized by co-precipitation method. The CWO reaction was performed in a batch reactor at mild conditions (temperature = 120 degrees C and oxygen pressures = 0.5 MPa) with a catalyst concentration of 3 g/1 for 3 h duration. Among all the catalysts, Cu/Ce/AC catalyst showed the maximum chemical oxygen demand (COD) and total organic carbon (TOC) removals (88% and 82%, respectively) from the wastewater. The ferulic acid removal was resulted from a combination of reactions (such as oxidation, hydrolysis, decarboxylation and adsorption). During the CWO reaction, oxalic acid was identified as the major by-product but mean oxidation state of carbon and TOC balance calculation indicated also the presence of other compounds. A significant difference in the surface characteristics of the fresh and thermally regenerated catalysts (after CWO) was observed. The first time reuse of Cu/Ce/AC catalyst caused 6% lesser reduction in TOC than the fresh catalyst though no considerable reduction in the catalytic activity could be observed after second reuse of the catalyst. The future study should plan for the determination of the change in biodegradability after the treatment and the effectiveness of CWO on real pulping effluent. (C) 2014 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-28T16:47:22Z
2014-12-28T16:47:22Z
2014
 
Type Article
 
Identifier CHEMICAL ENGINEERING JOURNAL, 252185-193
1385-8947
1873-3212
http://dx.doi.org/10.1016/j.cej.2014.04.110
http://dspace.library.iitb.ac.in/jspui/handle/100/16922
 
Language English