Journal
CHEMICAL ENGINEERING JOURNAL
Volume 379, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122398
Keywords
Low-temperature NH3-SCR; Iron doped; Activated carbon; Mn-Ce oxide catalysts
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Funding
- National Natural Science Foundation of China [51874058, 51604048]
- Fundamental Research Funds for the Central Universities [2018CDYJSY0055]
- Graduate Research and Innovation Foundation of Chongqing, China [CYS18001]
- Fund of Sichuan Key Research & Development Projects [2018SZ0281]
- Fund of Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Ministry of Education) [JKF18-07]
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To clarify the Fe doped effects over activated carbon (AC) supported Mn-Ce oxide catalysts and study the influence of Fe addition on the AC, several Mn/Ce/Fe mixed oxide catalysts prepared via an impregnation method supported on AC were investigated for low-temperature selective catalytic reduction (SCR) of NO with NH3. The Mn-Ce-Fe/AC catalyst with 5% (mass ratio) loading exhibited the highest catalytic activity and yielded above 90% NO conversion at 125 degrees C with a space velocity of 12,000 h(-1). The Fe addition could obviously reduce the destruction of AC surface area. Also, the metal ions could insert into graphite crystallite structures of AC, splitting it into smaller graphene-like sheets. After doping with Fe species, the relative ratios of Mn-4/Mnn+, Ce3+ /Cen+ and the surface adsorbed oxygen greatly enhanced in Mn-Ce-Fe/AC catalyst. Additionally, both weak acid and medium acid amount increased significantly after the Fe species introduced in Mn-Ce/AC, which could be attributed to the more exposed active sites of acid due to Fe species or its influence on Mn/Ce species. Relying on the obtained results, a L-H mechanism was proposed, owing to the Fe doping, the average valence state of Mn ions and surface adsorbed oxygen both increased on the Mn-Ce-Fe/AC catalyst, specially accompanying with the surface acid sites promotion, therefore remarkably promoting the denitration efficiency due to all the cumulative effect.
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