Journal
JOURNAL OF CLEANER PRODUCTION
Volume 151, Issue -, Pages 465-474Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2017.03.085
Keywords
Lean-burn engine exhaust; Electrochemical oxidation; Gas diffusion electrode; NO adsorption; NOx removal mechanism
Categories
Funding
- Major National Science & Technology Projects of China on Water Pollution Control and Treatment [2012ZX07501002-001]
- Research Project of Tianjin City for Application Foundation and Advanced Technology [BE026071]
- Fundamental Research Funds for the Central Universities
Ask authors/readers for more resources
With the aim to remove NOx from the lean-burn engine exhaust, a novel in-situ electrochemical device was designed using carbon black-based gas diffusion electrode (GDE) as cathode. Taking advantage of the excessive O-2 from the exhaust, in-situ electro-generation of H2O2 from oxygen reduction reaction (ORR) under catalysis of the GDE could oxidize NOx to NO3-. The highest NOx removal efficiency was 77.7% for 1000 ppm NOx with energy consumption of 1.327 W cm(-2) cm(-3). The electrochemical NOx removal pathway was proposed that, as NOx and 02 were adsorbed on different sites in the catalyst layer (CL), electro-generated H2O2 attacked the C-N adsorption bonds mostly in the nitro compounds to oxidize adsorbed NO to NOT, while NO2 was directly oxidized by the produced H2O2 in the electrolyte. The NOx removal efficiency is mainly controlled by the NO adsorption rate as well as the H2O2 oxidation rate, and the former is the dominant factor. This in-situ electrochemical NOx removal system exhibited properties of energy-saving, low cost and environmental compatibility, indicating great potential for industrial application. (C) 2017 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available