Regeneration of Pd/TiO sub(2 catalyst deactivated in reductive CCl) sub(4) transformations by the treatment with supercritical CO sub(2, ozone in supercritical CO) sub(2) or oxygen plasma

Carbonaceous deposits formation was established as the primary reason of Pd/TiO sub(2 catalyst deactivation during reductive processing of CCl) sub(4) to form hydrodechlorination and oligomerization products. Three methods of carbonaceous deposits elimination were tested: (1) extraction by supercrit...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2011-09, Vol.58 (2), p.263-271
Main Authors: Lokteva, Ekaterina S, Lazhko, Aleksey E, Golubina, Elena V, Timofeev, Vadim V, Naumkin, Alexander V, Yagodovskaya, Tatiana V, Gaidamaka, Sergey N, Lunin, Valery V
Format: Article
Language:English
Subjects:
Carbon dioxide
Catalysts
Deposition
Oxygen plasma
Ozone
Palladium
Regeneration
Titanium dioxide
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Summary:Carbonaceous deposits formation was established as the primary reason of Pd/TiO sub(2 catalyst deactivation during reductive processing of CCl) sub(4) to form hydrodechlorination and oligomerization products. Three methods of carbonaceous deposits elimination were tested: (1) extraction by supercritical CO sub(2, (2) oxidation by ozone in supercritical CO) sub(2), and (3) low-temperature glow-discharge oxygen plasma treatment. Synchronic thermal analysis confirms effective carbonaceous deposits removal during regeneration by ozone or low temperature glow-discharge oxygen plasma; by XPS deep oxidation of surface Pd after oxidative treatment (by ozone or oxygen plasma) was found. Thus H sub(2 reduction was proposed as the second step making possible full regeneration of initial catalytic activity of Pd/TiO) sub(2).
ISSN:0896-8446
DOI:10.1016/j.supflu.2011.05.018