HAIGASUJOKAYOSHOKUBAINOSAISEIHOHO

摘要

PURPOSE:To remove poisonous substances penetrating into a catalyst as well as those present on the surface of the catalyst and to regenerate the catalyst by treating the deteriorated catalyst with a dil. aq. soln. contg. hydrogen fluoride and ammonium hydrogenfluoride and/or alkali hydrogenfluoride. CONSTITUTION:When a catalyst having activity reduced by poisoning by Si, P and S compds. in exhaust gas is activated and regenerated, the catalyst is immersed in an aq. medium contg. hydrogenfluoride and ammonium hydrogenfluoride and/or alkali fluoride. It is then washed and dried. The poisonous substances penetrating into the catalyst as well as those present on the surface of the catalyst are removed without damaging the whole of the catalyst at low temperature and the catalyst is activated and regenerated.