NO reduction property of apatite-type La8A2Si6O26 (A = Ca, Sr, Ba) supported Pt catalyst

Abstract Apatite-type silicate (La 8 A 2 Si 6 O 26 (A = Ca, Sr, Ba)) supported Pt catalysts were prepared and their catalytic activities were investigated for NO reduction. La 8 A 2 Si 6 O 26 were obtained by the sol–gel method. Pt/La 8 A 2 Si 6 O 26 (A = Ca, Sr, Ba) catalysts loaded with 1 mass% of Pt were prepared by the impregnation method. The maximum NO conversions for C 3 H 6 –NO–O 2 reaction over Pt/La 8 A 2 Si 6 O 26 catalyst were 37%, 41% and 50% for A = Ca, Sr and Ba, respectively. The reduction properties of Pt on the catalysts were evaluated by temperature programmed reduction (TPR). The composition of the apatite-type support affected the reduction property of Pt on the catalyst, resulting in promotion of catalytic activity for C 3 H 6 –NO–O 2 reaction below 300 °C.