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Reducing dioxin formation by adding hydrogen in simulated fly ash.

J Yang1, X D Li, W J Meng

  • 1State Key Laboratory of Clean Energy Utilization, Zhejiang University, Zheda Road 38#, Hangzhou, China.

Environmental Science and Pollution Research International
|May 1, 2015
PubMed
Summary
This summary is machine-generated.

Adding hydrogen to simulated fly ash significantly inhibits dioxin formation, reducing polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) by over 90%. This study explores hydrogen

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Area of Science:

  • Environmental Chemistry
  • Combustion Science

Background:

  • Dioxin formation during combustion is a significant environmental concern.
  • Fly ash, a byproduct of combustion, can contain catalysts like copper that promote dioxin synthesis.
  • Understanding factors influencing dioxin formation is crucial for emission control.

Purpose of the Study:

  • To investigate the impact of hydrogen addition on dioxin (PCDD/F) formation from fly ash containing copper catalysts.
  • To quantify the inhibition efficiency of hydrogen on dioxin generation.
  • To propose a mechanism for hydrogen's inhibitory effect.

Main Methods:

  • Simulated fly ash with CuO and CuCl2 was heated at 350°C under nitrogen (N2) and nitrogen with 10% hydrogen (H2) atmospheres.
  • Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) output was measured.
  • Flue gas components, including HCl and NH3, were analyzed using Gasmet.

Main Results:

  • Hydrogen addition drastically reduced PCDD/F formation for both CuO (7.382 ng/g to 0.708 ng/g) and CuCl2 (589 ng/g to 46.1 ng/g) samples.
  • The inhibition rate for PCDD/F formation exceeded 90%.
  • HCl and NH3 were detected, providing insights into the reaction pathways.

Conclusions:

  • Hydrogen addition is a highly effective method for inhibiting dioxin formation in fly ash.
  • The study proposes a probable mechanism for hydrogen's inhibitory action based on experimental data.
  • Findings suggest potential strategies for reducing dioxin emissions from combustion processes.