In-situ regeneration of NbOX/TiO2 catalyst deteriorated due to coke deposition via supercritical water oxidation

In this study, supercritical oxidation was used as a method for in situ regeneration of deteriorated NbOX/TiO2 catalyst during glycerol dehydration in supercritical water at 400 ℃ and 30 MPa. When the dehydration reaction using NbOX/TiO2 was conducted, coking of the catalyst occurred, and the activity of the catalyst decreased over time. The regeneration process was conducted by simply changing the feed material from an aqueous glycerol solution to an aqueous hydrogen peroxide solution. After regeneration, the catalytic activity was similar to that of the fresh catalyst. The regeneration time can be shortened by increasing the flow rate of the aqueous solution.