Reduction of NOx with ammonia over Fe/MFI: Reaction mechanism based on isotopic labeling. SUN Q,GAO Z,CHEN H etal. Journal of Catalysis . 2001SUN Q,GAO Z,CHEN H etal.Reduction of NOx with ammonia over Fe/MFI: Reaction mechanism based on isotopic labeling.Journal of Catalysis. 2001...
At higher temperatures, the reaction becomes independent of the O2 concentration. The rate of the selective catalytic reduction of NO with ammonia may be considerably enhanced by converting part of the NO into NO2. DRIFT measurements have shown that NH3 and NO2 are adsorbed on the catalyst ...
catalyst in the appropriate temperature, using ammonia (NH3) as the reducing agent, take the advantage of the reducing agent selective, preferentially reaction with industrial flue gas of nitrogen oxide(NOX), NOX is converted into no pollution of nitrogen and w...
A seen from the initial kinetic analysis, elevated temperatures have a detrimental effect on the selectivity, leading to ammonia getting oxidized (Equation 2) rather than be consumed in the NO reducing reaction (Equation 1). A plot of r1/r2 on the symmetry surface of the monolith is shown ...
SCR CATALYTIC CONVERTER HAVING IMPROVED NOx CONVERSIONThe invention relates to the possibility of improving selective catalytic reduction (SCR), which is the selective reaction of nitrogen oxides with ammonia in the exhaust gas of combustion processes on an exhaust-gas catalytic converter suitable there...
Ammonia slip from SNCR systems occurs either from injection at temperatures too low for effective reaction with NOx or from over-injection of reagent leading to uneven distribution. Controlling ammonia slip in SNCR Air Pollution XII, C. A. Brebbia (Editor) © 2004 WIT Press, www.witpress.com...
Summary Fe-ZSM5 coated on a cordierite monolith was characterized and tested in the selective reduction of nitrogen oxides (NOx) with ammonia. More than 70 % of the NOxwere converted at T>350 C if only NO was present in the feed. For equimolar amounts of NO and NO2in the feed, NOx...
The results indicate that NH3 and HCN in HT-DeNOx can reduce NO during the reaction process. With very little ammonia injection (normalized stoichiometric ratio NSR=0.1, the normalized stoichiometric ratio), the efficiency of NO reduction by HT-DeNOx is 27.72%. Combining SNCR (NSR=1.1) and HT...
It has also been observed that the stoichiometry of the process is a function of the reaction temperature, with a secondary NH3 oxidation reaction appearing at temperatures above 500 K. As revealed by X-ray photoelectron spectroscopy, the copper remains mainly as Cu+ species at steady state ...
Copper ions exchanged into zeolites are active for the selective catalytic reduction (SCR) of nitrogen oxides (NOx) with ammonia (NH3), but the low-temperature rate dependence on copper (Cu) volumetric density is inconsistent with reaction at single sites. We combine steady-state and transient ki...