多壁碳纳米管负载TiO2的光催化脱硝性能

doi:10.1016/S1872-2067(12)60705-0

催化学报 ›› 2014, Vol. 35 ›› Issue (1): 66-77.DOI: 10.1016/S1872-2067(12)60705-0

多壁碳纳米管负载TiO₂的光催化脱硝性能

刘浩^a, 张海茹^b, 杨宏旻^a

a 南京师范大学能源与机械工程学院, 江苏南京 210042;
b 南京圣诺热管有限公司设计院, 江苏南京 210009

收稿日期:2013-07-21 修回日期:2013-09-05 出版日期:2013-12-23 发布日期:2014-01-17
通讯作者: 杨宏旻
基金资助:
国家自然科学基金（50976049）；江苏省自然科学基金（BK2011788）；江苏省研究生科研创新计划（CXLX12-0410）

Photocatalytic removal of nitric oxide by multi-walled carbon nanotubes-supported TiO₂

Hao Liu^a, Hairu Zhang^b, Hongmin Yang^a

a School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, Jiangsu, China;
b Design Institute of Nanjing Shengnuo Heat Pipe Co., Ltd, Nanjing 210009, Jiangsu, China

Received:2013-07-21 Revised:2013-09-05 Online:2013-12-23 Published:2014-01-17
Contact: Hongmin Yang
Supported by:
This work was supported by the National Natural Science Foundation of China (50976049), the Natural Science Foundation of Jiangsu (BK2011788) and Research Innovation Program for College Graduates of Jiangsu Province (CXLX12-0410).

摘要/Abstract

摘要：

采用溶胶凝胶法制备了多壁碳纳米管负载TiO₂（MWCNTs/TiO₂），并利用透射电镜、X射线光电子能谱、X射线衍射和紫外-可见漫反射光谱对样品进行了表征。结果表明，MWCNTs/TiO₂晶型以锐钛矿为主，MWCNTs的引入会限制TiO₂晶粒的生长。另外，MWCNTs/TiO₂的光吸收边向长波区域偏移。针对模拟烟气，在固定床光催化反应器中对采用涂覆处理的MWCNTs/TiO₂的光催化脱硝性能进行了实验研究。结果表明，NO初始浓度较低时，光催化脱硝效率较高，SO₂的存在可抑制光催化脱硝过程，而O₂及H₂O则有促进作用。在最佳实验条件（73 mg/m³ NO，8% O₂，5% H₂O）下，光催化脱硝效率可达46%。提出了光催化脱硝反应机理。

关键词: 多壁碳纳米管, 二氧化钛, 光催化, 脱硝, 烟气

Abstract:

Multi-walled carbon nanotubes (MWCNTs) coated with TiO₂ were prepared by a sol-gel method and characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and UV-Vis diffuse reflectance spectroscopy. It was found that MWCNTs/TiO₂ consisted mainly of anatase phase. The introduction of MWCNTs inhibited TiO₂ grain growth. Moreover, the adsorption edge of MWCNTs/TiO₂ shifted toward long-wavelength region compared with bare TiO₂. The photocatalytic ability of MWCNTs/TiO₂ for NO removal was experimentally investigated in a fixed-bed reactor. The results showed that a lower initial NO concentration was conducive to NO removal. A negative effect of SO₂ on denitration was observed. In contrast, O₂ and H₂O played a promotional role in the photocatalytic denitration. At optimal conditions (73 mg/m³ NO, 8% O₂, 5% H₂O), NO removal efficiency of 46% was achieved. In addition, the reaction mechanism of denitration was proposed.

Key words: Multi-walled carbon nanotube, Titanium dioxide, Photocatalysis, Denitration, Flue gas

刘浩, 张海茹, 杨宏旻. 多壁碳纳米管负载TiO₂的光催化脱硝性能[J]. 催化学报, 2014, 35(1): 66-77.

Hao Liu, Hairu Zhang, Hongmin Yang. Photocatalytic removal of nitric oxide by multi-walled carbon nanotubes-supported TiO₂[J]. Chinese Journal of Catalysis, 2014, 35(1): 66-77.

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多壁碳纳米管负载TiO₂的光催化脱硝性能

Photocatalytic removal of nitric oxide by multi-walled carbon nanotubes-supported TiO₂

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