Formation of Amorphous Pt Oxides: Characterization and Their Catalysis

Satoshi Kameoka; Masahiko Shimoda; Yoshitaka Matsushita; Yoshiyuki Yamashita; Yoshio Katsuya; Masahiko Tanaka; An-Pang Tsai

doi:10.2320/matertrans.MF201410

Satoshi Kameoka, Masahiko Shimoda, Yoshitaka Matsushita, Yoshiyuki Yamashita, Yoshio Katsuya, Masahiko Tanaka, An-Pang Tsai

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Keywords: amorphous platinum (Pt) oxides, PtO_x, catalytic material, leaching, Cu₃Pt, carbon monoxide (CO) oxidation

JOURNAL FREE ACCESS

2015 Volume 56 Issue 4 Pages 490-494

DOI https://doi.org/10.2320/matertrans.MF201410

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Abstract

Amorphous Pt oxides (am-PtO_x) were formed by the leaching of copper from a Cu₃Pt alloy in concentrated HNO₃ at 323 K for 12 h. The resulting am-PtO_x was characterized using synchrotron X-ray powder diffraction, hard X-ray photoelectron spectroscopy, thermal analysis (TG-DTA, TPD) and the BET method. This material had a high specific surface area with micropores (61.7 m²/g) and decomposed to form Pt and O₂ at approximately 720 K. The catalytic performance of the am-PtO_x during CO oxidation was superior to that of a conventional Pt black catalyst. This study demonstrated a novel method of preparing am-PtO_x with applications as a catalyst.

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