在TiO2的催化氧化过程中促进NO氧化:表面硫酸盐的关键作用
Weiwei Kong1, Shule Zhang1, Qin Zhong1
1School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China.
ACS omega
|November 17, 2025
概括
含硫的前体显著提高二氧化 (TiO2) 催化剂的性能,用于氧化氧化 (NO) 在过子过程中. 剩余的硫酸盐组增强了酸度和稳定性,改善了工业应用.
科学领域:
- 催化剂是一种催化剂.
- 环境化学环境化学
- 材料科学 材料科学 材料科学
背景情况:
- 为氧化氧化 (NO) 开发高效的催化剂对于环境修复至关重要.
- 使用臭氧和过氧化的过子工艺是NO氧化的一种有前途的方法.
- 二氧化 (TiO2) 是一个关键材料,但其制备方法影响了催化活性.
研究的目的:
- 研究不同二氧化 (TiO2) 前体在催化过子过程中对NO氧化效率的影响.
- 阐明残留硫酸盐组在提高TiO2催化性能方面的作用.
- 优化TiO2制备,以改善NO氧化中的工业应用.
主要方法:
- 使用三种前体合成TiO2:氧化 (Ti-BO),甲酸 (Ti-MTA) 和硫酸 (Ti-TOS).
- 在特定反应条件下NO氧化效率的评估 (373K,O3/NO=0.4,H2O2/NO=1.2,GHSV=1.2 × 10^5 h^-1).
- 分析催化剂特性,重点关注易斯酸度和残留硫酸盐群的影响.
主要成果:
- 与Ti-BO (78%) 相比,从Ti-TOS和Ti-MTA合成的TiO2显示出明显更高的NO氧化效率 (分别为93%和87%).
- 剩余的硫酸盐组 (SO4^2-) 被确定为关键促进体,通过从Ti^4+位点中提取电子来增强易斯酸度.
- 硫酸盐促进H2O2脱,加速激素生成,抑制酸盐积累,减弱NO吸附,优化反应动力学和催化剂稳定性.
结论:
- 在TiO2前体中的残留硫酸盐组在增强NO氧化催化过子过程中发挥着至关重要的作用.
- 增强的易斯酸度和抑制的酸盐积累有助于改善催化活性和稳定性.
- 这项研究为优化TiO2制备提供了有效的工业NO氧化方法的见解.
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