Jan 13, 2020 · Operando infrared (IR) spectroscopy and density functional theory (DFT) calculations were combined to investigate the selective catalytic reduction (SCR) of NO x by NH 3 over H-AFX zeolites. The steady-state kinetics shows that SCR reactions involving NO 2 proceed much more rapidly than those of NO.

Mar 15, 2021 · Selective catalytic reduction (SCR) in the presence of NH 3 with different NO 2 /NO x ratios over activated carbon (AC) was investigated. NO x conversion at NO 2 /NO x = 1.0 was higher than that at NO 2 /NO x = 0 and 0.5 in the temperature range of 90–210 °C.

Using the ISORROPIA-II thermodynamic aerosol model and detailed observational data sets, we explore the sensitivity of aerosol NH4NO3 to gas-phase NH3 and NOx controls for a number of contrasting locations, including Europe, the United States, and China.

Jul 31, 2018 · As an important intermediate product of NOx reduction at low temperatures, NH4NO3 formation rate is strongly dependent on the apparent rate of SCR reaction.

Cu-containing CHA type (Cu-CHA) zeolites have been widely investigated owing to their excellent low-temperature activity and high hydrothermal stability in selective catalytic reduction of NOx with NH3 (NH3-SCR).

Jun 24, 2019 · As one of the most effective NOx emission removing technologies to meet the Tier III limitation by International Maritime Organization, urea-selective catalytic reduction (SCR) technology is starting to be used in two-stroke marine diesel engines.

Jan 13, 2020 · Operando infrared (IR) spectroscopy and density functional theory (DFT) calculations were combined to investigate the selective catalytic reduction (SCR) of NOx by NH3 over H-AFX zeolites. The...

Jul 31, 2018 · According to working characteristics and exhaust conditions of Diesel engine, a NH3−NO/NO2−SCR reaction model including NOx reduction, NH4NO3 formation and decomposition pathways was proposed in this paper, and the influence of NH4NO3 on the NOx reduction pathways and low-temperature catalytic…

Aug 1, 2018 · According to working characteristics and exhaust conditions of Diesel engine, a NH3−NO/NO2−SCR reaction model including NOx reduction, NH4NO3 formation and decomposition pathways was...

Effect of NH4NO3 feed concentration on the steady state NOx conversion over the V2O5–WO3/TiO2 catalyst in comparison to standard and fast SCR. GHSV = 33 000 h 1. Feed: 1000 ppm NOx, 1000 ppm NH3, 1 % H2O, 2 % O2 in N2. Standard SCR runs: NO2/ NOx = 0; fast SCR runs: NO2/NOx = 1/2.