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On the dual role of the reactant during aqueous phase hydrodechlorination of trichloroethylene (HDC of TCE) using Pd supported on swellable organically modified silica (SOMS)
Date
2021-08-01
Author
Ailawar, Saurabh
Hunoor, Anagha
Rudzinski, Benjamin
Çelik, Gökhan
Burel, Laurence
Millet, Jean-Marc
Miller, Jeffrey T.
Edmiston, Paul L.
Ozkan, Umit S.
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Herein, the dual role of trichloroethylene (TCE) in liquid-phase hydrodechlorination with Pd catalysts supported on swellable organically modified silica (SOMS), is investigated. Batch experiments with TCE-soaked Pd/SOMS showed 45% higher conversion after 4 h than dry Pd/SOMS, suggesting that TCE acts as a reactant and as a swelling-agent. Flow experiments performed with and without ethanol (external swelling-agent) exhibited similar steady-state activities, confirming that TCE itself can cause swelling. Moreover, flow experiments, regardless of whether the SOMS-supported Pd catalysts were pre-reduced or not, yielded similar steady-state conversions, suggesting that Pd(2+) is rapidly reduced by H2 dissolved in water during approach to steadystate. In-situ characterization performed under reaction conditions using time-resolved X-ray absorption spectroscopy confirmed the reduction of Pd(2+) species to Pd(0) by dissolved H2. Overall, this study shows economic viability of hydrodechlorination of TCE using Pd/SOMS by eliminating the need for an external swelling-agent as well as a catalyst pre-reduction step.
Subject Keywords
Pd supported on swellable organically modified silica (SOMS)
,
Hydrodechlorination
,
Catalyst deactivation
,
Trichloroethylene In-situ X-ray absorption near edge spectroscopy
,
(XANES)
,
Hydrophobicity
URI
https://hdl.handle.net/11511/91644
Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
DOI
https://doi.org/10.1016/j.apcatb.2021.120060
Collections
Department of Chemical Engineering, Article
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S. Ailawar et al., “On the dual role of the reactant during aqueous phase hydrodechlorination of trichloroethylene (HDC of TCE) using Pd supported on swellable organically modified silica (SOMS),”
APPLIED CATALYSIS B-ENVIRONMENTAL
, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/91644.