Design of Highly Active Photocatalytic System for the Removal of NOx

高活性光催化脱硝系统设计

• 批准号: 02044125
• 负责人: ANPO Masakazu
• 金额: $ 0.9万
• 依托单位: University of Osaka Prefecture
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02044125/
• 关键词: photocatalysis; NOx decomposition; photocatalytic decomposition; ion-echanged catalyst; copper ion catalyst; ESR measurement; FT-IR measurement; surface active site

Reducing global air pollution caused by NOx and SOx is currently an urgent and serious challenge. Utilization of photocatalytic processes in gas-solid systems also promising. In the present project, we have studied and found that Cu^<2+> ions supported on silica (Cu^<2+>/SiO_2) and Y-Zeolite (Cu^<2+>/Y-Zeolite) prepared by an ion-exchange method are easily reduced to Cu^+ ions when the Cu^<2+>/SiO_2 and Cu^<2+>/Y-Zeolite samples are evacuated at temperatures higher than 573 K and the reduced Cu^+ ions on silica (Cu^+/SiO_2) and Y-Zeolite (Cu^+/Y-Zeolite) catalysts can decompose NO molecules photocatalytically and stoichiometrically into N_2 and O_2 at 275 K.UV irradiation ( 270 nm) of the Cu^+/SiO_2 and Cu^+/Y-Zeolite catalysts in the presence of NO molecules at 275 K was found to lead to the decomposition of NO into N_2 and O_2. Decomposition of NO proceeds linearly with UV irradiation time at 275 K. The major products of NO decomposition were N_2 and O_2 with a minor formation of N_2 … More O and NO_2. These minor products were found to be secondary products of N, O, and NO, and the overall reaction was found to be stoichiometrical. Thus, these results clearly indicate that UV irradiation of the CU^+/SiO_2 catalyst (or Cu^+/Y-Zeolite) in the presence of NO leads to the photocatalytic decomposition of NO into N_2 and O_2 at 275 K.The physicochemical and photochemical properties of Cu^+ ions anchored onto SiO_2 and Y-Zeolite have been investigated by means of ESR measurements of the copper (Cu^<2+>) ions and of NO species adsorbed on the copper ions and dynamic photoluminescence measurements of the excited state of the copper (Cu^+) ions (3d^94s^1 electronic state), as well as product analysis of photodecomposition of NO molecules. These results indicate that the excited state of copper ions (Cu^+ ions) plays a significant role in the photocatalytic decomposition of NO molecules and the photoreaction involves an electron transfer from the excited state of the Cu^+ ion into an anti-bonding orbital of NO molecule within the lifetime of its excited state.Thus, the present results obtained with the Cu^+/SiO_2 and Cu^+/Y-Zeolite catalysts imply the possibility of their utilization as a potentially promising type of photocatalysts for the direct decomposition of NOx into N_2 and O_2 at around normal temperature. Less

当前，由NOX和Sox引起的全球空气进行了挑战，并且在当前的项目中也很有希望。 /sio_2）和y- zeolite（Cu^<2+>/y-zeolite）通过离子交换方法制备的方法很容易减少到Cu^<2+>/sio_2和Cu^<2+时Cu^+离子在高于573 K的温度下撤离的>/Y-ZOLITE样品，Sio_2 eolite（Cu^+/Y-Zeolite）上的Cu^+离子降低的催化剂可以将NOLECULES分解为光催化和stoichiometrilly（275 k.uv in_2） _2和cu^+/y-zyolite催化剂的nm）在275 K战争时没有分子的情况，导致IND O_2的分解。否，否否​​，否否否否否N_2和O_2的N_2次要组成……更多的O和NO_2是N，O的次要产品，这些结果清楚地表明Cu^+/siO_2催化剂（或Cu^+/Y-Zeolite）在没有NO的情况下导致275 K时N_2和O_2的光致应分解。已经通过铜（Cu） ^<2+>）离子的ESR测量来研究了固定在SIO_2和Y-沸石上的+离子，并且没有吸附在铜离子上的无物质和动态光致发光测量（Cu^+）离子（3DS（3D）^94S^1电子状态），以及NO分子的光二次组成的产物分析。分子和光健康涉及从激发的cu^+离子陈述的电子转移到Ann抗键控轨道圆柱上，并带有STHUS，目前的结果是用Cu^+/sio_2和Eolite催化剂作为其用作作为其使用的可能性，这意味着它们作为一种可能性作为一种可能性。在正常温度下，可能会直接分解为N_2和O_2的光催化剂

项目成果

M. Anpo: "Preparation of Supported Vanadium Oxide by Photochemical Anchoring Method and Photocatalytic Reactions on It" J. Surf. Sci. Jpn.11. 39-44 (1990)

M. Anpo：“光化学锚定法制备负载型氧化钒及其光催化反应”J. Surf。

M. Anpo: Kluwer Academic Pul. (Dordrecht). Photochemical Conversion and Storage of Solar Energy, (1991)

M. Anpo：Kluwer 学术杂志。

T.Fujii,A.Ishii,S.Suzuki,M.Che, M.Anpo: "Photophysics on Solid Surfaces. TimeーResolved Fluorescence Spectra of Pyrene Adsorbed on Calcinated Vycor Glass" Bull.Chem.Soc.,Jpn.,. 63. 2475-2480 (1990)

T.Fujii、A.Ishii、S.Suzuki、M.Che、M.Anpo：“固体表面上的光物理学。吸附在煅烧 Vycor 玻璃上的芘的时间分辨荧光光谱”Bull.Chem.Soc.，Jpn.,。 63.2475-2480（1990）

M. Anpo: "Basis and Applications of Photocatalysis" Proc. of ILTJ. (1991)

M. Anpo：“光催化的基础和应用”Proc。

M. Anpo, T. Suzuki, Y. Yamada, Y. Otsuji, E. Giamello, M. Che: Elsevier (Amsterdam). New Developments in Selective Oxidation, 683-692 (1990)

M. Anpo、T. Suzuki、Y. Yamada、Y. Otsuji、E. Giamello、M. Che：爱思唯尔（阿姆斯特丹）。