Processing of Coked Pt–Re/γ-Al_2O_3 Catalysts with High-Concentration Ozone Dissolved in Supercritical Carbon Dioxide

摘要

The potentialities of low-temperature (50–150℃) regeneration of coked Pt–Re/γ-Al_2O_3 bime- tallic catalysts of reforming with high-concentration ozone dissolved in supercritical carbon dioxide (SC-CO_2) are examined. Raman spectroscopy, thermogravimetric, and differential microcalorimetric stud- ies show that solid organic deposit (coke), a by-product of the reforming process, can be partially removed from the mesoporous surface of a coked catalyst by processing with an O_3/SC-CO_2 mixture without any loss of the active components (Pt, Re). Treatment of coked Pt–Re/γ-Al_2O_3 catalysts with an O_3/SC-CO_2 mixture causes changes in the parameters (extent of conversion, selectivity) of the catalytic reforming of n-heptane.