Low temeprautre ozone regeneration of oxoanion promoted zirconia catalysts for paraffin conversion

摘要

A regeneration scheme was tried wich targeted a near isothermal operation of SO_4~2-ZrO_2 catalsyts for isomerization of n-butane; ozone regeneration at low temperature (150 deg C). A reaction-regeneration cycle in a pulse reactor was used to evaluate the properties of ozone and air for restoring the catalytic activity of the coked catalyst. Ozone was found to be able of burning the coke deposit over SO_4~-2-ZrO_2 to a great extent and an activity induction period afte rregeneration could be seen. Reaction (300degC) and regeneration (150 degC) had a temperature gap in this system. On Fe-Mn promoted O_4~_2-ZrO_2 a fully isothermal reaction-regeneration at 150 degC was hypothetically possible but O_3 treatments did not restore the doriginal activity, dur to a destructure of the promotion action of Fe-Mn onthe active sites.