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

Apatite-type silicate (La8A2Si6O26 (A = Ca, Sr, Ba)) supported Pt catalysts were prepared and their catalytic activities were investigated for NO reduction. La8A2Si6O26 were obtained by the sol–gel method. Pt/La8A2Si6O26 (A = Ca, Sr, Ba) catalysts loaded with 1 mass% of Pt were prepared by the impregnation method. The maximum NO conversions for C3H6–NO–O2 reaction over Pt/La8A2Si6O26 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 C3H6–NO–O2 reaction below 300 °C.

Figure optionsDownload as PowerPoint slideResearch highlights▶ The composition of support affected the reduction property of Pt on the catalyst. ▶ The oxidized Pt species on fresh catalysts were reduced during C3H6–NO–O2 reaction. ▶ The composition of apatites affected catalytic activity for reactions involving C3H6.