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Wet air oxidation of formic acid using nanoparticle-modified polysulfone hollow fibers as gas-liquid contactors

Hogg, Seth R. and Muthu, Satish and O’Callaghan, Michael and Lahitte, Jean-Francois and Bruening, Merlin L. Wet air oxidation of formic acid using nanoparticle-modified polysulfone hollow fibers as gas-liquid contactors. (2012) ACS Applied Materials & Interfaces, vol. 4 (n° 3). pp. 1440-1448. ISSN 1944-8244

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Official URL: http://dx.doi.org/10.1021/am201693e

Abstract

Catalytic wet air oxidation (CWAO) using membrane contactors is attractive for remediation of aqueous pollutants, but previous studies of even simple reactions such as formic acid oxidation required multiple passes through tubular ceramic membrane contactors to achieve high conversion. This work aims to increase single-pass CWAO conversions by using polysulfone (PS) hollow fibers as contactors to reduce diffusion distances in the fiber lumen. Alternating adsorption of polycations and citrate-stabilized platinum colloids in fiber walls provides catalytically active PS hollow fibers. Using a single PS fiber, 50% oxidation of a 50 mM formic acid feed solution results from a single pass through the fiber lumen (15 cm length) with a solution residence time of 40 s. Increasing the number of PS fibers to five while maintaining the same volumetric flow rate leads to over 90% oxidation, suggesting that further scale up in the number of fibers will facilitate high single pass conversions at increased flow rates. The high conversion compared to prior studies with ceramic fibers stems from shorter diffusion distances in the fiber lumen. However, the activity of the Pt catalyst is 20-fold lower than in previous ceramic fibers. Focusing the Pt deposition near the fiber lumen and limiting pore wetting to this region might increase the activity of the catalyst.

Item Type:Article
Additional Information:Thanks to the American Chemical Society. The definitive version is available at http://pubs.acs.org The original PDF of the article can be found at ACS Applied Materials & Interfaces website : http://pubs.acs.org/doi/abs/10.1021/am201693e
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Michigan State University - MSU (USA)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Vincent GERBAUD
Deposited On:06 Nov 2013 10:09

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