RT Journal Article
T1 Comparison of Cu-CHA-zeolites in the hybrid NSR-SCR catalytic system for NOx abatement in mobile sources
A1 Molina-Ramírez, Sergio
A1 Cortés-Reyes, Marina
A1 Herrera-Delgado, María Concepción
A1 Larrubia-Vargas, María Ángeles
A1 Alemany-Arrebola, Luis José
K1 Catalizadores
K1 Motores diesel
K1 Aire -- Contaminación -- Control
K1 Control de la contaminación del aire
AB DeNOx activity in a NSR–SCR hybrid system of two copper-containing chabazite-type zeolitic catalysts was addressed. A Pt-Ba-K/Al2O3 model catalyst was used as the NSR (NOx storage and reduction) catalyst. For the SCR (selective catalytic reduction) system, two Cu-CHA zeolites were synthesized employing a single hydrothermal synthesis method assisted with ultrasound and incorporating Cu in a 2 wt.%, 2Cu-SAPO-34 and 2Cu-SSZ-13. The prepared catalysts were characterized, and the crystallinity, surface area, pore size, HR-TEM and EDX mapping, coordination of Cu ions and acidity were compared. The NH3 storage capacity of the SCR catalysts was 1890 and 837 μmol NH3·g−1cat for 2Cu-SAPO-34 and 2Cu-SSZ-13, respectively. DeNOx activity was evaluated for the single NSR system and the double-bed NSR–SCR by employing alternating lean (3%O2) and rich (1%H2) cycles, maintaining a concentration of 600 ppm NO, 1.5% H2O and 0.3% CO2 between 200 and 350 °C. The addition of the SCR system downstream of the NSR catalyst significantly improved NOx conversion mainly at low temperature, maintaining the selectivity to N2 above 80% and reaching values above 90% at 250 °C when the 2Cu-SSZ-13 catalyst was located. The total reduction in the production of NH3 and ~2% of N2O was observed when comparing the NSR–SCR configuration with the single NSR catalyst.
PB MDPI
YR 2023
FD 2023-03-10
LK https://hdl.handle.net/10630/26769
UL https://hdl.handle.net/10630/26769
LA eng
NO Molina-Ramírez S, Cortés-Reyes M, Herrera C, Larrubia MÁ, Alemany LJ. Comparison of Cu-CHA-Zeolites in the Hybrid NSR-SCR Catalytic System for NOx Abatement in Mobile Sources. Chemistry. 2023; 5(1):602-615. https://doi.org/10.3390/chemistry5010043
NO SMR acknowledges the Economy and Competitiveness Spanish Ministry for the Ph.D. grant (PRE-2018-086107). Authors want to thank the financial support of CTQ 2017-87909-R Project from the Economy and Competitiveness Spanish Ministry. Partial funding for open access charge: Universidad de Málaga
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026