Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Hydrodechlorination of CHClF2 (HCFC-22) over Pd-Pt catalysts supported on thermally modified activated carbon. Beneficial effect of catalyst oxidation.

Version 1 : Received: 1 April 2021 / Approved: 5 April 2021 / Online: 5 April 2021 (12:12:38 CEST)

How to cite: Radlik, M.; Juszczyk, W.; Raróg-Pilecka, W.; Zybert, M.; Karpiński, Z. Hydrodechlorination of CHClF2 (HCFC-22) over Pd-Pt catalysts supported on thermally modified activated carbon. Beneficial effect of catalyst oxidation.. Preprints 2021, 2021040110 (doi: 10.20944/preprints202104.0110.v1). Radlik, M.; Juszczyk, W.; Raróg-Pilecka, W.; Zybert, M.; Karpiński, Z. Hydrodechlorination of CHClF2 (HCFC-22) over Pd-Pt catalysts supported on thermally modified activated carbon. Beneficial effect of catalyst oxidation.. Preprints 2021, 2021040110 (doi: 10.20944/preprints202104.0110.v1).

Abstract

Pd-Pt catalysts supported on carbon preheated to 1600°C have been reinvestigated in CHFCl2 hydrodechlorination. An additionally adopted catalyst oxidation at 350-400°C produced an order of magnitude increase in the catalytic activity of Pd/C. This increase is not caused by changes in metal dispersion or possible decontamination of the Pd surface from superficial carbon, but rather by unlocking the active surface, originally inaccessible in metal particles tightly packed in the pores of carbon. Burning carbon from the pore walls attached to the metal changes the pore structure, providing easier access for the reactants to the entire palladium surface. As upon calcination the performance of the rest of the Pd-Pt/C catalysts changes less than for Pd/C, the relation between the turnover frequency and alloy composition does not confirm the Pd-Pt synergy invoked in our previous work. The use of even higher-preheated carbon (1800°C), completely free of micropores, results in a Pd/C catalyst that does not need to be oxidized to achieve high activity and excellent selectivity up to CH2F2 (>90%).

Subject Areas

hydrodechlorination; CHClF2; Pd-Pt/C; thermally modified carbon; effect of catalyst oxidation; pore structure changes

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.