In a reforming catalyst apparatus provided with a reforming catalyst for forming
a hydrogen rich reformed gas by a reforming reaction of the fuel with water, the
catalyst performance can be recovered by heating the catalyst within a temperature
ranging from 500 C. to 800 C. while supplying said fuel and air to
the catalyst. This method allows recovery of the catalyst performance without demounting
the catalyst from the reforming catalyst apparatus and allows providing the reforming
catalyst with a long service life.
