Abstract
Promoted (Co, Ni)-Mo/γ-Al 2O 3 hydrodesulphurization catalysts have been decoked using hydrogen gasification. The catalysts were exposed to a benzene, toluene and xylene (BTX) feed for one week until a significant level of coke had been built up on the surface. The catalysts were then decoked by gasifi- cation at 400°C in hydrogen. The decoking was monitored using the X-ray photoelectron spectroscopy C/Al ratio. After 6 h gasification there was a tenfold decrease in the C/A1 ratio indicating a significant amount of decoking. Furthermore, the initial activity was regained as determined by the conversion of a standard BTX feed.
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