Coke removal from an old industrial hydrodesulfurization catalyst was examined utilising DBD non-thermal plasma with a pin to plate geometry. The hydrodesulfurization (HDS) process is one of the most essential processes in a refinery for eliminating sulfur-containing chemicals. As a thin wafer, the aged catalyst was inserted into the plasma reactor. With P=30W, 70 percent of coke was eliminated after 130 minutes of plasma treatment, while more than 40% of sulphur remained. Coke was more easily removed at the middle of the wafer, close to the pin electrode, where the electric field is more intense, according to characterization of the catalyst at different locations on the wafer. The emergence of an unexpected phase under plasma discharge was noticed; it belongs to the Keggin HPA PMo12O403- family and could be a promising catalyst precursor for the HDS process. The rate of regeneration for the HDS catalyst is lower under plasma discharge than for a coked zeolite, and a lower temperature is required under normal thermal oxidation. It is explained by the presence of metal particles, which may be the cause of the O-atom production limitation in plasma.
Author(S) Details
Ludovic Pinard
IC2MP, UMR CNRS 7285, ENSIP, Université de Poitiers, 1 rue Marcel Doré, 86022 Poitiers, France.
Catherine Batiot-Dupeyrat
IC2MP, UMR CNRS 7285, ENSIP, Université de Poitiers, 1 rue Marcel Doré, 86022 Poitiers, France.
View Book:- https://stm.bookpi.org/CACS-V6/article/view/4357
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