A delaminated Fe2O3-pillared clay catalyst was prepared for the selective catalytic reduction (SCR) of NO by NH3 at above 300 degrees C. The delaminated pillared clay was characterized by inductively coupled plasma-atomic emission spectroscopy chemical analysis, X-ray diffraction structure and line broadening analyses, micropore size probing, and Mossbauer analysis. These analyses showed that the catalyst contained fragmented Fe2O3-pillared clay forming "house-of-cards" structure with dispersed Fe2O3 particles approximately 170 Angstrom, in size. The SCR activity of the delaminated pillared clay was higher than the commercial-type V2O5 + WO3/TiO2 catalyst, and also higher than the undelaminated pillared clay and supported Fe2O3 catalysts, under conditions without SO2. Infrared measurements of adsorbed NH3 showed strong Bronsted acidity which was caused possibly by interactions between Fe2O(3) and clay.