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

Authors: Kato, Sumio¹; Yoshizawa, Takuya¹; Kakuta, Nobuhiro¹; Akiyama, Shinya¹; Ogasawara, Masataka¹; Wakabayashi, Takashi²; Nakahara, Yuunosuke²; Nakata, Shinichi¹

Source: Research on Chemical Intermediates, Volume 34, Numbers 8-9, 2008 , pp. 703-708(6)

Publisher: VSP, an imprint of Brill

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Abstract:

Apatite-type silicate supported precious metal catalysts were prepared and investigated for their catalytic activity in selective catalytic NO reduction. Single-phase La_9.33Si₆O₂₆ and La_8.33ASi₆O_25.5 (A = Ca, Sr, Ba) were obtained by a sol-gel method. Pd/La_9.33Si₆O₂₆ catalyst exhibited high activity for oxidation of C₃H₆, comparable to Pd/Al₂O₃ catalyst, although the specific surface area of La_9.33Si₆O₂₆ was lower than that of Al₂O₃. In addition, Pt/La_9.33Si₆O₂₆ catalyst exhibited higher activity for selective catalytic reduction of NO than Pt/Al₂O₃ catalyst. Substitution of Ba²⁺ for La³⁺ of La_9.33Si₆O₂₆ led to increased catalytic activity at low temperature.

Keywords: APATITE-TYPE SILICATE; PRECIOUS METAL; NO REDUCTION

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156856708786189410

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

Publication date: 2008-10-01