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Novel Photocatalytic NH3 Synthesis by NO3 Reduction over CuAg/TiO2

1
Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Mie 514-8507, Japan
2
Global Environment Center for Education & Research, Mie University, Mie 514-8507, Japan
*
Author to whom correspondence should be addressed.
ChemEngineering 2019, 3(2), 49; https://doi.org/10.3390/chemengineering3020049
Received: 7 December 2018 / Revised: 26 April 2019 / Accepted: 5 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Advances in Metal-Based Catalysts)
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Abstract

The highly effective reaction system was investigated for the photocatalytic ammonia synthesis from the reduction of nitrate ions by using the semiconductor photocatalyst, Cu and Ag doped on TiO2 (CuAg/TiO2) at room temperature under UV light irradiation (max. 352 nm). In this study, CuAg/TiO2 gave the high efficiency and the selectivity for the ammonia synthesis by the photoreduction of nitrate in the presence of methanol as a hole scavenger. For the evaluation of the photocatalytic activity over CuAg/TiO2, various TiO2 samples, such as standard TiO2, Cu/TiO2, and Ag/TiO2, were evaluated in the same procedure. The chemical properties were investigated by XRD, TEM, XPS, PL, and DRS. We examined the optimum conditions for the experimental factors and the important issues, including the effect of the molar ratio of Cu and Ag onto TiO2, the optimization of the CuAg amount loaded on TiO2, the influence of the loading amount of the catalyst on the reduction of nitrate ions, the exploration of the optimum hole scavenger, and the reusability of the optimum photocatalyst. The very efficient conversion of nitrate ions (95%) and the highest selectivity (86%) were achieved in the reaction with the optimum conditions. Here, we reported the process that nitrate ions can efficiently be reduced, and ammonia can be selectively synthesized over CuAg/TiO2. View Full-Text
Keywords: ammonia synthesis; reduction of nitrate; photocatalyst; CuAg/TiO2 ammonia synthesis; reduction of nitrate; photocatalyst; CuAg/TiO2
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kato, R.; Furukawa, M.; Tateishi, I.; Katsumata, H.; Kaneco, S. Novel Photocatalytic NH3 Synthesis by NO3 Reduction over CuAg/TiO2. ChemEngineering 2019, 3, 49.

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