摘要该研究旨在研究UV/H2O2体系下，通过TiS催化剂光催化氧化提高脱除燃煤锅炉烟气中NO能力的机理。研究了不同催化剂和烟气组成对NO脱除效率的影响，发现与纯TiO2体系及无催化剂存在情况下的UV/H2O2体系相比，S掺杂TiO2显著提升了NO脱除效率。另外，H2O2和UV照射在该体系中也能起到很大的促进作用。检测表明最终的氧化产物是稳定的硝酸盐。通过XRD，TEM，XPS，UV-vis和DFT计算等方法所得的催化剂特性分析表明S以S6+的形式掺杂在TiO2中，TiO2与TiS复合氧化物之间形成了Ti1-xSxOx+2的异质结。S掺杂提高了TiO2催化剂的价带电势。另外，我们通过PL光谱测试，EPR，PCBA和RhB的液体紫外分析研究了TiS催化剂加强NO氧化的机理。我们发现价带反应对TiS(TiO2)+UV+H2O2体系非常重要，占据了主导作用，是TiS催化剂加强NO氧化的主要原因。42546

关键词  光催化氧化；NO；紫外光/双氧水体系；TiS；氧化能力强化

毕业论文设计说明书外文摘要

Title   Photocatalysis oxidation removal of NO from flue gas ofcoal-fired boilers by UV/H2O2 over TiS catalyst    advanced oxidation process

Abstract

This study aimed at investigating the photocatalysis oxidation removal of NO from flue gas of coal-fired boilers by UV/H2O2 over TiS catalyst advanced oxidation process. The effects of different catalysts and gas compose on NO oxidation were investigated and found that the S doped TiO2 catalyst could clearly improve the NO oxidation, compared with TiO2 and no catalyst in the H2O2/UV system In addition, the H2O2 and UV could also play an important role in the NO oxidation. Furthermore, the NO oxidative products were the stable nitrate. Analysis of catalyst characterizations by XRD, TEM, XPS, UV-vis and DFT calculations showed that the S (S6+) doping TiO2 catalyst included the heterostructure of Ti1-xSxOx+2 compounds and TiO2. The S doping increased the VB potential for the TiS catalyst. In addition, we designed different tests of PL，EPR liquid UV-vis analysis-PCBA and RhB to confirm the mechanism of enhanced NO oxidation over TiS catalyst. It was investigated that the reactions in the VB were important to the NO oxidation over the TiS(TiO2)+UV+H2O2 catalytic system. It was the reason of the enhanced NO oxidation for the TiS catalyst.

Keywords：photocatalysis oxidation; NO; UV/H2O2; TiS; advanced oxidation process

目   次

1  引言 2

2  实验 4

2.1 催化剂制备 4

2.2 催化剂活性测试 5

2.3 计算明细 5

2.4 特性描述 6

3  结果和讨论 7

3.1 催化剂活性测试 7

3.1.1  催化剂性能 7

3.1.2  气体组成，催化剂和紫外光的影响 8

3.1.3  氧化产物分析 10

3.2 催化剂特性研究 12

3.2.1  XRD分析 12

3.2.2  TEM分析 14

3.2.3  XPS分析 17

3.2.4  UV-vis-NIR分析 20

3.2.5  表面DFT计算 21

3.3  S掺杂TiO2脱硝能力强化的机理证明 23

3.3.1  PL分析 23

3.3.2  EPR分析