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Crystal phase changes catalyst performance for NOx and VOC removal

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An industrial laboratory or plant room with large blue industrial equipment, metal piping, ductwork, and what appears to be chemical processing or air filtration systems, photographed in landscape orientation with bright overhead lighting.
Research area:Chemical engineeringIndustrial Gas Emission ControlCatalytic Processes in Materials Science

What the study found

The study found that the crystal phase of TiO2-supported V2O5 catalysts changes which pollutant combination they handle best. Anatase-based catalysts worked better for NOx-toluene coremoval, while rutile-based catalysts worked better for NOx-chlorobenzene elimination.

Why the authors say this matters

The authors say this matters because vanadium-titanium catalysts are already used for selective catalytic reduction (SCR, a process for reducing nitrogen oxides) but perform less well in mixed flue gases containing NOx, aromatic VOCs such as toluene, and chlorinated VOCs such as chlorobenzene. They conclude that using phase-specific strengths in one reactor could avoid separate control units and reduce retrofit cost and space constraints.

What the researchers tested

The researchers compared two TiO2-supported V2O5 catalysts: anatase (V/TiO2-A) and rutile (V/TiO2-R). They evaluated them for simultaneous removal of NOx with toluene or chlorobenzene, studied the reaction mechanisms, and then designed a tandem catalyst system with V/TiO2-R upstream and V/TiO2-A downstream in a single SCR reactor.

What worked and what didn't

V/TiO2-A showed superior activity for NOx-toluene coremoval, and V/TiO2-R showed optimal NOx-chlorobenzene elimination. Mechanistic studies linked V/TiO2-A to oxygen vacancies that enhanced toluene activation, and V/TiO2-R to high V5+/V4+ ratios and Brønsted acidity that promoted chlorobenzene activation and HCl formation. The tandem system achieved more than 90% simultaneous conversion of NOx, chlorobenzene, and toluene at 375 °C, outperforming individual catalysts, physical mixtures, and commercial benchmarks with high HCl selectivity.

What to keep in mind

The abstract does not describe detailed experimental conditions beyond the reported reactor setup and temperature. It also does not provide long-term stability data, full operating limits, or information on performance outside the tested pollutant combinations.

Key points

  • Anatase-based V/TiO2-A performed better for NOx-toluene coremoval.
  • Rutile-based V/TiO2-R performed better for NOx-chlorobenzene elimination.
  • Oxygen vacancies in V/TiO2-A were linked to enhanced toluene activation.
  • High V5+/V4+ ratios and Brønsted acidity in V/TiO2-R were linked to chlorobenzene activation and HCl formation.
  • A tandem reactor setup achieved >90% simultaneous conversion of NOx, chlorobenzene, and toluene at 375 °C.

Disclosure

Research title:
Crystal phase changes catalyst performance for NOx and VOC removal
Authors:
Zhuang Liu, Jin Yuan, Lin Chen, Chang Wang, Xinhao Bai, Jinxing Mi, Jianjun Chen, Junhua Li
Institutions:
Guizhou Center for Disease Control and Prevention, Guizhou Center for Disease Control and Prevention, Guizhou University, Guizhou University, Tsinghua University, Tsinghua University, Tsinghua University, Tsinghua University, Tsinghua University, Tsinghua University
Publication date:
2026-02-26
DOI:
10.1021/acs.est.5c17618
OpenAlex record:
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AI provenance: This post was generated by gpt-5.4-mini (OpenAI). The original authors did not write or review this post.