DELAMINATED FE2O3-PILLARED CLAY - ITS PREPARATION, CHARACTERIZATION, AND ACTIVITIES FOR SELECTIVE CATALYTIC REDUCTION OF NO BY NH3

A delaminated Fe2O3-pillared clay catalyst was prepared for the select ive catalytic reduction (SCR) of NO by NH3 at above 300 degrees C. The delaminated pillared clay was characterized by inductively coupled pl asma-atomic emission spectroscopy chemical analysis, X-ray diffraction structure and line broadening analyses, micropore size probing, and M ossbauer analysis. These analyses showed that the catalyst contained f ragmented Fe2O3-pillared clay forming ''house-of-cards'' structure wit h dispersed Fe2O3 particles approximately 170 Angstrom, in size. The S CR activity of the delaminated pillared clay was higher than the comme rcial-type V2O5 + WO3/TiO2 catalyst, and also higher than the undelami nated pillared clay and supported Fe2O3 catalysts, under conditions wi thout SO2. Infrared measurements of adsorbed NH3 showed strong Bronste d acidity which was caused possibly by interactions between Fe2O(3) an d clay. (C) 1995 Academic Press, Inc.