Photodecomposition of NOx on Ag/TiO2 composite catalysts in a gas phase reactor

Photodecomposition of NOx on Ag/TiO2 composite catalysts in a gas phase reactor
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气相反应器中 Ag/TiO2 复合催化剂光分解 NOx

DOI:
10.1016/j.cej.2016.08.080
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发表时间:
2017
影响因子:
15.1
通讯作者:
Dengwei Jing
Dengwei Jing
中科院分区:
工程技术1区
文献类型:
--
作者:
Mengxi Xu;Yunhai Wang;Jiafeng Geng;Dengwei Jing

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没有AS模型气体成分,分别研究了紫外线下的光催化NOX分解和可见光照射,分别在解剖酶TiO2和Ag/TiO2上的气相光催化反应器中进行了研究。 TiO2和Ag/TiO2通过通过溶不能进行的方法制备,并以X射线衍射(XRD),BET,透射电子显微镜(TEM)和X射线光电光谱(XPS)等为特征。分别通过N2的NO和屈服分别评估光催化剂的活性。已经发现,尽管没有纯tio2的光分解非常快,但尚未将其转换为N2和O2。这意味着某些副产品已经形成。 N2形成是一个相对较慢的过程。已经发现,通过将适当量的Ag引入TIO2中,可以显着提高Nox将NOX的光分解的选择性显着提高。在TiO2上加载的1 wt%Ag证明了无分解和N2产生的最高活性。增强解剖酶Ag/TiO2WA光催化活性的可能机制归因于TiO2表面上AG0AND AG+的共存,而Ag+/ag比为ca。 0.86,在光催化过程中起着不同的作用。我们的研究对于具有高选择性的NOX光二次分解的有效光催化剂的开发可能很有价值。
With NO as model gas component, photocatalytic NOx decomposition under UV and visible light irradiation has been investigated in a gas phase photocatalytic reactor over anatase TiO2and Ag/TiO2, respectively. TiO2and Ag/TiO2were prepared by a solvothermal method and characterized by X-ray diffraction (XRD), BET, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) etc. The activity of the photocatalysts was evaluated by decomposition rate of NO and yield of N2, respectively. It was found that although photodecomposition of NO over pure TiO2is very quick, NO has not been converted into N2and O2. It means that some by-products have formed. N2formation is a relatively slower process. It was found that the selectivity for photodecomposition of NOx into N2can be significantly improved by introducing appropriate amount of Ag into TiO2. The 1 wt% Ag loaded on TiO2showed the highest activity for both NO decomposition and N2production. The possible mechanism for the enhancement of photocatalytic activity of anatase Ag/TiO2was attributed to the coexistence of Ag0and Ag+on the surface of TiO2, with a Ag+/Ag ratio of ca. 0.86, which played different roles in the photocatalytic process. Our study could be valuable for the development of efficient photocatalyst for NOx photodecomposition with a high selectivity.
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