Detailed kinetic modeling of NH3 SCR over Cu-ZSM-5

Effects of post-treatment method and Na co-cation on the hydrothermal stability of Cu–SSZ-13 catalyst for the selective catalytic reduction of NO with NH3

“…From the perspective of zeolites, some large and medium pore zeolites have received much attention in the past two decades, such as Y (FAU framework), Beta (BEA framework), and ZSM-5 (MFI framework). Cu and Fe have been the most widely used transition metal ions in NH 3 -SCR zeolite catalysts, owing to their good redox capacity [8,9]. Most of these catalysts show good NH 3 -SCR performance under high gas hourly space velocity (GHSV), which is crucial for their practical application in diesel vehicles with limited installation space on board [10][11][12].…”

Microkinetic modeling and analysis of ethanol partial oxidation and reforming reaction pathways on platinum at short contact times

“…Microkinetic modeling has been applied in the past for a variety of chemical processes such as methane partial oxidation and reforming [14,57,58], selective catalytic reduction of NO x [59,60], NO oxidation [61], ammonia decomposition [13,62], ethylene hydrogenation [63], and Water-Gas Shift [64][65][66], to name a few recent applications.…”

Selective catalytic reduction of nitrogen oxides with ammonia over microporous zeolite catalysts

“…Finally the desorption of ammonia was measured using a CX4000 Gasmet FTIR gas analyzer when the temperature was ramped up to 600°C at 10°/min. Aluminum coordination and environment were measured by 27 Al-MAS-NMR and spectra were recorded on similar sample amounts at 104.2 MHz with a spinning rate of 10 kHz using pulses of 1 µs, corresponding to a flip magnetization angle < π/12 radians with a 1 s repetition time. 27 Al chemical shifts are reported relative to Al(H 2 O) 3+ 6 .…”

“…For the abatement of NO x using copper zeolites, by far most literature data is available for Cu-MFI, Cu-BEA, Cu-FAU, Cu-MOR and Cu-FER. [16][17][18][19][20][21][22][23][24][25][26][27] Over the years less common topologies, which are not commercially available, have also been studied as potential candidates for the SCR reaction, [28][29][30][31][32][33][34][35].…”

“…Afterwards, the catalytic performance is correlated with material changes obtained from various characterization techniques. N 2 -physisorption NH 3 -TPD and 27 Al-MAS-NMR is used to characterize changes to the framework and XAFS, FTIR and H 2 -TPR techniques is used to monitor changes in copper speciation. As a reference to the changes in material and catalytic performance various copper containing phases are also tested in the SCR reaction and TEM/EDS is used to verify the migration of copper ions from CuO into zeolite ion exchange positions.…”