Synthesis of MnOx/Oxidized-MWNTs for Abatement of Nitrogen Oxides

• Published in: Catalysis letters 2013-02, Vol.143 (2), p.184-192
• Main Authors: Pourkhalil, Mahnaz, Zarringhalam Moghaddam, Abdolsamad, Rashidi, Alimorad, Towfighi, Jafar, Jafari Jozani, Kheirollah, Bozorgzadeh, Hamidreza
• Format: Article
• Language: English
• Subjects: Adsorption; Ammonia; Catalysis; Catalysts; Chemistry; Chemistry and Materials Science; Exact sciences and technology; General and physical chemistry; Helium; Industrial Chemistry/Chemical Engineering; Manganese; Multi wall carbon nanotubes; Nanotubes; Nitrogen oxide; Nitrogen oxides; Organometallic Chemistry; Physical Chemistry; Selective catalytic reduction; Selectivity; Temperature; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-012-0938-6

A series of manganese oxide catalysts supported on oxidized multi-walled carbon nanotubes for low temperature selective catalytic reduction of nitrogen oxides (NOx) with NH 3 in the presence of excess O 2 was prepared by a simple impregnation method. These catalysts were characterized by N 2 adsorption, TEM, XRD and H 2 -TPR methods. The effects of reaction temperature, MnOx loading, and calcination temperature were investigated. Under the reaction conditions of 483 K, 1 bar, NO = NH 3  = 900 ppm, 5 vol% O 2 , GHSV = 30,000 h −1 , and 12 wt% MnOx, NOx conversion and N 2 selectivity of 91 and 99 %, respectively, were obtained. The LTSCR activity was suppressed in the presence of 100 ppm SO 2 and 2.5 vol% H 2 O at reaction temperatures below 573 K, but it was reversible to its initial level after heating and sweeping the catalyst at 573 K for 2 h in Helium. Graphical Abstract