Visible-light-assisted selective catalytic reduction of NO with NH3 on porphyrin derivative-modified TiO2 photocatalysts

Akira Yamamoto; Yuto Mizuno; Kentaro Teramura; Saburo Hosokawa; Tetsuya Shishido; Tsunehiro Tanaka

doi:10.1039/C4CY00598H

Visible-light-assisted selective catalytic reduction of NO with NH₃ on porphyrin derivative-modified TiO₂ photocatalysts†

Akira Yamamoto,^a Yuto Mizuno,^a Kentaro Teramura,*^abc Saburo Hosokawa,^ab Tetsuya Shishido

^bd and Tsunehiro Tanaka*^ab

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* Corresponding authors

^a Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto daigaku Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
E-mail: teramura@moleng.kyoto-u.ac.jp
Fax: +81 75 383 2561
Tel: +81 75 383 2559

^b Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30 Goryo-Ohara, Nishikyo-ku, Kyoto 615-8245, Japan

^c Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan

^d Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan

Abstract

Porphyrin-derivative-modified TiO₂ photocatalysts showed high photocatalytic activity for the selective catalytic reduction of NO with NH₃ in the presence of O₂ under visible-light irradiation. Tetra(p-carboxyphenyl)porphyrin (TCPP) was the most effective photosensitizer among the five porphyrin derivatives investigated. NO conversion and N₂ selectivity of 79.0% and 100%, respectively, were achieved at a gas hourly space velocity of 50 000 h⁻¹. UV–Vis and photoluminescence spectroscopies revealed the presence of two species of TCPP on the TiO₂ surface; one was a TCPP monomer and the other was an H-aggregate of the TCPP molecules. It was concluded that the TCPP monomer is an active species for the photo-assisted selective catalytic reduction (photo-SCR). Moreover, an increase in the fraction of H-aggregates with increasing TCPP loading amount resulted in a decrease in the photocatalytic activity of the photo-SCR.

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Article information

DOI: https://doi.org/10.1039/C4CY00598H
Article type: Paper
Submitted: 08 May 2014
Accepted: 16 Sep 2014
First published: 18 Sep 2014

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Catal. Sci. Technol., 2015,5, 556-561

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Visible-light-assisted selective catalytic reduction of NO with NH₃ on porphyrin derivative-modified TiO₂ photocatalysts

A. Yamamoto, Y. Mizuno, K. Teramura, S. Hosokawa, T. Shishido and T. Tanaka, Catal. Sci. Technol., 2015, 5, 556 DOI: 10.1039/C4CY00598H

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