Advances and perspectives from a decade of collaborative efforts on zeolites for selective catalytic reduction of NOx

[EN] Nitrogen oxides (NOx) is a major air pollutant and its release is regulated by increasingly stringent legislation. Selective catalytic reduction using ammonia as a reductant (NH3-SCR) is the most widely applied method to reduce NOx from diesel vehicle exhaust. Significant technological achievements have been developed in the last 10-15 years to minimize NOx by NH3-SCR, particularly using Cu-containing small-pore zeolites as active and stable catalysts. In the present perspective, we highlight some of the most noteworthy advances achieved by industry and academia on the understanding of the unique reaction mechanism of NH3-SCR over Cu-zeolites. With the increased understanding, researchers have been able to rationalize the design and realization of new Cu-zeolite catalysts. Although light-duty diesel vehicles will be electrified in the near future, heavy-duty diesel vehicles will continue to play a large role in future powertrain solutions even beyond 2030. Hence, we highlight some of the challenges and perspectives moving forward.This work has been supported by Umicore and by the Spanish Government through PID2021-122755OB-I00 funded by MCIN/AEI/10.13039/501100011033 and TED2021-130739B-I00 funded by MCIN/AEI/10.13039/501100011033/EU/PRTR, and by Generalitat Valenciana through AICO/2021/201.Vennestrøm, PN.; Thogersen, JR.; Gabrielsson, PLT.; Van Tendeloo, L.; Schütze, FW.; Moliner Marin, M. (2022). Advances and perspectives from a decade of collaborative efforts on zeolites for selective catalytic reduction of NOx. Microporous and Mesoporous Materials. 358:1-12. https://doi.org/10.1016/j.micromeso.2022.11233611235

Synthesis, characterization and reactivity of high hydrothermally stable Cu-SAPO-34 materials prepared by one-pot processes

This paper focuses on the design of an innovative air-conditioning system, namely a magnetocaloric air-conditioner for an electric minibus. An integrated design of the complete system is necessary, as the hot and cold side of the regenerator will work under dynamic conditions which depend on the instantaneous thermal load in the cabin. In order to assist the design of the system, a dynamic model has been developed for the cabin, the hydraulic loops and heat exchangers, and the magnetocaloric unit. This paper presents (i) a description of the dynamic models, (ii) an analysis of the operating conditions of the magnetocaloric unit and (iii) a discussion on the design of the magnetocaloric air-conditioner. The results show that the electric minibus requests 1.60 kW of cooling power over a span of 37 K in cooling mode, and 3.39 kW of heating power over a span of 40 K.This work has been supported by Haldor-Topsoe, the Spanish Government through Consolider Ingenio 2010-Multicat, the "Severo Ochoa Program", and MAT2012-37160. Manuel Moliner also acknowledges to "Subprograma Ramon y Cajal" for the contract RYC-2011-08972. The authors thank Isabel Millet for technical support.Martínez Franco, R.; Moliner Marin, M.; Concepción Heydorn, P.; Thogersen, JR.; Corma Canós, A. (2014). Synthesis, characterization and reactivity of high hydrothermally stable Cu-SAPO-34 materials prepared by one-pot processes. Journal of Catalysis. 314:73-82. https://doi.org/10.1016/j.jcat.2014.03.018S738231