Effect of concentrated NaCl on catalytic wet oxidation (CWO) of short chain carboxylic acids

The effect of concentrated NaCl (200 g L−1) on CWO of oxalic acid and acetic acid over MnCeOx was investigated at 110 °C and 0.5 MPa O2 to explore the potential of using CWO for shale gas wastewater treatment. The presence of concentrated NaCl hindered oxalic acid conversion, which from ATR-IR spect...

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Bibliographic Details
Published in:Catalysis communications 2022-02, Vol.162, p.106395, Article 106395
Main Authors: Ou, Xiaoxia, Daly, Helen, Chansai, Sarayute, Beaumont, Simon K., Fan, Xiaolei, Hardacre, Christopher
Format: Article
Language:English
Subjects:
Catalytic wet oxidation (CWO)
In situ ATR spectroscopy
MnCeOx
Salt effect
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Summary:The effect of concentrated NaCl (200 g L−1) on CWO of oxalic acid and acetic acid over MnCeOx was investigated at 110 °C and 0.5 MPa O2 to explore the potential of using CWO for shale gas wastewater treatment. The presence of concentrated NaCl hindered oxalic acid conversion, which from ATR-IR spectroscopy was attributed to the salting out effect increasing the oxalic acid surface coverage with formation of strongly adsorbed intermediates, slowing oxalic acid mineralisation. In addition, the weak adsorption of acetic acid on MnCeOx was proposed to be responsible for the insignificant conversion with or without NaCl present. [Display omitted] •Effects of concentrated NaCl on CWO of acetic and oxalic acid was investigated.•The adsorption/CWO of carboxylic acid over MnCeOx was studied by in situ ATR-IR.•Increased oxalic acid coverage due to salting out inhibited CWO of oxalic acid.•Weak adsorption of acetic acid over MnCeOx resulted in low reactivity.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2021.106395