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The absorption of NO in aqueous solutions of KMnO4and H2SO4was carried out in a stirred tank reactor under atmosphere pressure. The results indicated that the absorption process was under a fast pseudo-mth reaction regime. The reaction between NO and aqueous solutions of KMnO4/H2SO4was found to be first-order with respect both to NO and to KMnO4. The addition of H2SO4to KMnO4solutions increased the absorption rate of NO and increasing reaction temperature was also favorable to the absorption of NO. [ABSTRACT FROM AUTHOR]

CeO2–CuO/Al2O3catalysts were prepared by three different methods and their activities for selective catalytic reduction (SCR) of NO with NH3were investigated. As can be seen from the experimental results, the catalyst prepared by the single-step sol–gel (SG) method showed the best SCR activity and resistance to SO2and H2O. In order to investigate the relationship between the preparation method and the performance of SCR catalysts, the catalysts were characterized by using Brunauer–Emmett–Teller, X-ray diffraction, temperature programmed reduction with hydrogen, temperature programmed desorption with ammonia, X-ray photoelectron spectroscopy, Fourier transform infrared and thermo-gravimetric analysis techniques. It was found that the excellent performance of CeO2–CuO/Al2O3catalyst prepared by the single-step SG method should be resulted from its large surface area, low crystallinity, high oxygen storage capacity, high NH3adsorption capacity, high concentration of surface chemisorbed oxygen, weak sulphation process and weak water absorption. [ABSTRACT FROM PUBLISHER]

CeO-CuO catalysts were prepared by citric acid method at different calcination temperatures. The purpose of this study is to investigate the influence of calcination temperature on the catalytic activity of CeO2-CuO catalyst for the selective catalytic reduction of NO with NH3. As can be seen from the results, Ce-Cu(450) is of the best low temperature selective catalytic reduction (SCR) activity among the three catalysts, which may be resulted from its large surface area, good redox ability, strong NH3 adsorption capacity, and high concentration of Cu2+ and active oxygen species on the surface. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 385-389, 2014 [ABSTRACT FROM AUTHOR]

NO is a major air pollutant from coal-fired power plants. A combined removal of SO2and NO is a prospective process. In this paper, the absorption kinetics of NO into weakly acidic NaClO solution was studied in a stirred tank reactor. It was proven that the absorption process occurred under the fast pseudo-mth reaction regime, and the reaction was found to be first-order with respect to both NO and NaClO. When the initial pH value of NaClO solution is 5.5, it has the best performance for NO absorption. The frequency factor and the average activation energy of this reaction were 7.96 × 108 m3/(mol s) and 28.15 kJ/mol, respectively. The absorption rate of NO increased with increasing reaction temperature. [ABSTRACT FROM PUBLISHER]