Green surfactant-modified TiO2 nanoparticles doped with La-Cr bimetal for NOx removal

Environ Sci Pollut Res Int. 2022 Nov;29(51):77711-77723. doi: 10.1007/s11356-022-20992-7. Epub 2022 Jun 10.


Cost-effective new environmental catalysts play a crucial role in purifying NOx from exhaust gas of coal mine diesel vehicle. A new, environmentally friendly catalyst with high catalytic activity and good redox properties was prepared by a microwave-assisted sol-gel method using TiO2 nanoparticles as a catalyst, which were doped with La and Cr, and adding the surfactant dimethyldiallylammonium chloride (DMDAAC) as an organic modifier. The morphological characteristics, crystalline structure, functional groups, and elemental types of the catalyst were characterized, and the properties of the catalyst, such as redox ability and catalytic activity, were examined with H2-temperature-programmed reduction experiments and activity tests. The results showed that the addition of surfactant suppressed the growth of particle size, increased the specific surface area, and improved the redox ability and catalytic activity of the catalyst. I hope to reduce the pollution of NOx to environment and achieve efficient cleaner production.

Keywords: Cryogenic purification; Exhaust gas of coal mine diesel vehicle; NOx; Nano-TiO2; Surfactant.

MeSH terms

  • Catalysis
  • Chlorides
  • Chromium / chemistry
  • Coal
  • Lanthanum / chemistry
  • Nanoparticles*
  • Nitrogen Oxides / chemistry
  • Surface-Active Agents*


  • Chlorides
  • Coal
  • Surface-Active Agents
  • titanium dioxide
  • Nitrogen Oxides
  • Chromium
  • Lanthanum