The　yCe/Al-Mn-pillared　interlayered　clay　(PILC,　y　[Ce　content]　=　8-9　wt%)　catalysts　were　prepared　using　the　impregnation　method.　Catalytic　activities　of　the　materials　for　the　selective　catalytic　reduction　(SCR)　of　NO　with　NH3　at　low　temperatures　were　evaluated,　and　physicochemical　properties　of　the　samples　were　characterized　by　X-ray　diffraction,　N-2　adsorption-desorption,　temperature-programmed　reduction,　ammonia　temperature-programmed　desorption,　X-ray　photoelectron　spectroscopy,　and　in　situ　diffuse　reflectance　infrared　Fourier　transform　spectroscopy　techniques.　It　is　found　that　introduction　of　cerium　enhanced　NO　conversions　at　low　temperatures,　and　the　8Ce/Al-Mn-pillared　sample　showed　the　highest　NO　conversion　(92%　at　300　degrees　C).　The　superior　catalytic　activity　of　8Ce/Al-Mn-PILC　was　associated　with　the　change　in　active　component　and　increases　in　amounts　of　the　surface　chemisorbed　oxygen　species　and　the　acid　sites　after　ceria　loading.　Additionally,　the　SCR　reaction　mechanism　over　8Ce/Al-Mn-PILC　followed　both　Langmuir-Hinshelwood　and　Eley-Rideal　mechanisms,　with　the　former　being　dominant.