Heat-Transfer Analysis of the Promotion of the CO2 Reduction Performance of a P4O10/TiO2 Photocatalyst Using a Black Body Material

IF 3.8 3区化学 Q2 CHEMISTRY, PHYSICAL

Catalysts Pub Date : 2023-11-28 DOI:10.3390/catal13121477

Akira Nishimura, Ryo Hanyu, Homare Mae, Hiroki Senoue, E. Hu

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Abstract

Since photocatalytic reactions are surface reactions, enhancing gas movement around the photocatalyst could improve photocatalytic CO2 reduction performance. A new approach using black body material to enhance the gas movement around the photocatalyst based on the natural thermosiphon movement of gases around a photocatalyst has been proposed and confirmed experimentally, but the heat-transfer mechanism of the phenomena has not yet been clarified. The aim of this study is to clarify the corresponding heat-transfer mechanism. This study calculated the temperature of the CO2/NH3 gas mixture around a P4O10/TiO2 photocatalyst using the heat-transfer formula. No difference was found between the temperature increase (Tg) from the temperature at the beginning of the CO2 reduction experiment (Tini) and the temperature of the CO2/NH3 gas mixture measured experimentally via thermocouple (Te) under the following illumination conditions: a Xe lamp with visible light (VIS) + infrared light (IR) and IR only. The heat-transfer model proposed in this study predicts Tg well under illumination from a Xe lamp with VIS + IR as well as under IR illumination only. On the other hand, the difference found between Tg and Te was as large as 10 °C under illumination from a Xe lamp with ultraviolet light (UV) + VIS + IR.

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利用黑体材料促进 P4O10/TiO2 光催化剂的二氧化碳还原性能的传热分析

由于光催化反应是表面反应，因此加强光催化剂周围气体的运动可以提高光催化还原二氧化碳的性能。有人根据光催化剂周围气体的自然热虹吸运动，提出了一种利用黑体材料增强光催化剂周围气体运动的新方法，并得到了实验证实，但该现象的传热机制尚未明确。本研究旨在阐明相应的传热机制。本研究利用热传递公式计算了 P4O10/TiO2 光催化剂周围 CO2/NH3 混合气体的温度。在以下照明条件下，二氧化碳还原实验开始时的温度升高（Tg）与通过热电偶实验测量的二氧化碳/NH3 混合气体的温度（Te）之间没有差异：可见光（VIS）+红外光（IR）的 Xe 灯和仅有红外光的 Xe 灯。本研究提出的传热模型可以很好地预测在有可见光 + 红外光的 Xe 灯照射下以及仅在红外光照射下的 Tg。另一方面，在紫外线 (UV) + VIS + IR 的 Xe 灯照射下，Tg 和 Te 之间的差异高达 10 °C。

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来源期刊

Catalysts CHEMISTRY, PHYSICAL-

CiteScore

6.80

自引率

7.70%

发文量

1330

审稿时长

3 months

期刊介绍： Catalysts (ISSN 2073-4344) is an international open access journal of catalysts and catalyzed reactions. Catalysts publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.