Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 56, Issue 13, Pages 3671-3678Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.6b04463
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Funding
- Science and Technology Plan Project of China's Ministry of Transport [2015328225150]
- National Natural Science Foundation of China [51402033, 51479020]
- Scientific Research Fund of Liaoning Provincial Education Department of China [L2014198]
- Fundamental Research Funds for the Central Universities [3132016018]
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Ultraviolet irradiated sodium chlorite (UV/NaClO2) solution was introduced to remove nitrogen oxide (NOx) from simulated flue gas in a bench-scale scrubbing reactor. Effects of UV irradiation time, NaClO2 concentration, NO inlet concentration, pH value, and O-2 concentration were investigated separately. Results showed that NaClO2 solution with UV pretreatment achieved a remarkable promotion in NOx removal efficiency. The ClO2 produced from photodecomposition of NaClO2 in aqueous solution substantially improved the NO absorption process. The NOx removal efficiency by UV/NaClO2 solution increased from 28 to 77% as the UV irradiation time increased from 0 to 600 s. When the NaClO2 concentration increased, the NOx removal efficiency by UV/NaClO2 solution increased, whereas the enhancement factor decreased. The NO absorption rate by UV/NaClO2 solution increased with NO inlet concentration. The NOx removal efficiency by UV/NaClO2 solution was higher than that by NaClO2 solution without UV pretreatment at a pH range of 3-12. The reaction mechanisms of the NO removal process were suggested to be different in acid and alkaline media. The UV/NaClO2 process was demonstrated to significantly improve NOx removal efficiency, which might he developed to be a potentially cost-effective method for removing NOx from flue gas.
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