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Design and Development of Unique Photocatalytic Systems for the Decomposition of NOx

设计和开发用于分解氮氧化物的独特光催化系统

基本信息

批准号：
10044170
负责人：
ANPO Masakazu
金额：
$ 2.05万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10044170/
关键词：
Metal ion-implantation method TiOィイD22ィエD2 photocatalyst NOx decomposition Utilization of solar beam Cr ion-implanted TiOィイD22ィエD2 Utilization of visible light Ag ZSM-5 酸化チタン太陽光イオン注入法 NO光触媒分解反応ゼオライト ESR

项目摘要

Until now, photocatalytic reactions involving TiO2 photocatalysts for the decomposition of NOx were known to proceed only under UV light irradiation. In this research project, by the application of advanced metal ion-implantation with various transition metal ions such as V and Cr, it was found that novel TiO2 photocatalysts which absorb and operate efficiently under visible light irradiation for the decomposition of NOx could be developed. In-situ ESR and XAFS investigations revealed that the implanted V ions which exist as VィイD14+ィエD1 at the lattice position in place of TiィイD14+ィエD1 ion play a significant role in the shift in the absorption bands of TiO2 toward visible light regions. On the other hand, highly dispersed TiO2 catalysts anchored within the pore structure of the Y-zeolite by an ion-exchange method (Ti-Y zeolite) exhibited higher photocatalytic activity as compared to powdered TiO2. V or Cr ion-implantation on the Ti-Y zeolite also leads to a shift in the absorption band of the catalyst toward visible light regions and it was found that these V or Cr ion-implanted Ti-Y zeolites successfully decompose NOx under irradiation with visible light longer than 450nm, while maintaining just as a high photocatalytic activity as observed before applying ion-implantation. Furthermore, in-situ ESR and FT-IR investigations *lucidated the electron transfer from the photo-excited active site of the photocatalyst into the p anti-bonding molecular orbital of NO which led to a weakening of the N-O bond and initiated the decomposition of the NO molecule. It can be said that the present research has opened the way to many innovative possibilities, significantly to address urgent environmental problem and also as an important breakthrough in the utilization of solar energy.

到目前为止，已知使用TiO2光催化剂分解NOx的光催化反应仅在紫外光照射下进行。本课题通过对V、Cr等多种过渡金属离子进行先进的金属离子注入，发现可以开发出在可见光照射下高效吸收并运行的新型TiO2光催化剂，用于分解NOx。现场ESR和XAFS调查显示存在的离子植入V VィイD14 +ィエD1在晶格位置的TiィイD14 +ィエD1离子转移中发挥重要作用的吸收带二氧化钛可见光区域。另一方面，通过离子交换方法将高度分散的TiO2催化剂（Ti-Y沸石）固定在y型沸石的孔结构中，与粉状TiO2相比，表现出更高的光催化活性。在Ti-Y沸石上注入V或Cr离子也导致催化剂的吸收带向可见光区移动，并且发现这些注入V或Cr离子的Ti-Y沸石在超过450nm的可见光照射下成功地分解了NOx，同时保持了与施加离子注入之前观察到的高光催化活性。此外，原位ESR和FT-IR研究*证实了电子从光催化剂的光激发活性位点转移到NO的p反键分子轨道，导致N-O键减弱，引发NO分子分解。可以说，目前的研究开辟了许多创新的可能性，对解决紧迫的环境问题具有重要意义，也是太阳能利用的重要突破。