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Preparation of apatite-type-silicate-supported precious metal catalysts for selective catalytic reduction of NOx

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Apatite-type silicate supported precious metal catalysts were prepared and investigated for their catalytic activity in selective catalytic NO reduction. Single-phase La9.33Si6O26 and La8.33ASi6O25.5 (A = Ca, Sr, Ba) were obtained by a sol–gel method. Pd/La9.33Si6O26 catalyst exhibited high activity for oxidation of C3H6, comparable to Pd/Al2O3 catalyst, although the specific surface area of La9.33Si6O26 was lower than that of Al2O3. In addition, Pt/La9.33Si6O26 catalyst exhibited higher activity for selective catalytic reduction of NO than Pt/Al2O3 catalyst. Substitution of Ba2+ for La3+ of La9.33Si6O26 led to increased catalytic activity at low temperature.

Affiliations: 1: Department of Materials-Process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University, 1-1 Tegatagakuen-machi, Akita, 010-8502, Japan; 2: Catalysts Division, Mitsui Mining & Smelting Co., Ltd., 1333-2 Haraichi, Ageo, Saitama, 362-0021, Japan


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