Journal ArticleDOI
Migration of Cu Ions in SAPO-34 and Its Impact on Selective Catalytic Reduction of NOx with NH3
Peter N. R. Vennestrøm,Anna Katerinopoulou,Ramchandra Tiruvalam,Arkady Kustov,Poul Georg Moses,Patricia Concepción,Avelino Corma +6 more
TLDR
In this article, the authors showed that migration of copper species from the surface region upon activation of Cu-SAPO-34 leads to a several-fold increase in catalytic activity for the selective catalytic reduction of NOx with NH3.Abstract:
Migration of copper species from the surface region upon activation of Cu–SAPO-34 leads to a several-fold increase in catalytic activity for the selective catalytic reduction of NOx with NH3. The temperatures required for the activation are higher than normal calcination temperatures and lead to a homogeneous transition metal distribution that renders Cu–SAPO-34 an industrially promising candidate for NOx removal.read more
Citations
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Journal ArticleDOI
Catalysis in a Cage: Condition-Dependent Speciation and Dynamics of Exchanged Cu Cations in SSZ-13 Zeolites
Christopher Paolucci,Atish A. Parekh,Ishant Khurana,John R. Di Iorio,Hui Li,Jonatan D. Albarracin Caballero,Arthur J. Shih,Trunojoyo Anggara,W. Nicholas Delgass,Jeffrey T. Miller,Fabio H. Ribeiro,Rajamani Gounder,William F. Schneider +12 more
TL;DR: Experimental and theory together reveal that the Cu sites respond sensitively to exposure conditions, and in particular that Cu species are solvated and mobilized by NH3 under SCR conditions.
Journal ArticleDOI
Probing zeolites by vibrational spectroscopies
Silvia Bordiga,Carlo Lamberti,Carlo Lamberti,Francesca Bonino,Arnaud Travert,Frédéric Thibault-Starzyk +5 more
TL;DR: This review addresses the most relevant aspects of vibrational spectroscopies applied to zeolites and zeotype materials and describes the methods needed to precisely determine the IR absorption coefficients, making IR a quantitative technique.
Journal ArticleDOI
In situ DRIFTS and temperature-programmed technology study on NH3-SCR of NOx over Cu-SSZ-13 and Cu-SAPO-34 catalysts
TL;DR: In situ diffuse reflectance infrared Fourier transform spectroscopy (In situ DRIFTS), temperature-programmed desorption (TPD), and temperatureprogrammed surface reactions (TPSR) were employed to investigate the adsorption and reactive properties of Cu-SSZ-13 and Cu-SAPO-34 zeolite catalysts; these fully formulated washcoat cordierite monoliths were hydrothermally treated at 750°C in the simulated feed gases.
Journal ArticleDOI
Recent advances in the selective catalytic reduction of NOx with NH3 on Cu-Chabazite catalysts
TL;DR: In this article, the development of Cu-chabazite (CHA) catalysts represents a significant technology breakthrough for the removal of NOx by selective catalytic reduction (SCR) with ammonia.
Journal ArticleDOI
Confining isolated atoms and clusters in crystalline porous materials for catalysis
Lichen Liu,Avelino Corma +1 more
TL;DR: In this paper, the authors discuss the structural features, synthesis methodologies, characterization techniques and catalytic applications of subnanometric species confined in zeolites and metal-organic frameworks and make a critical comparison between confined and non-confined isolated atoms and metal clusters, and provide future perspectives for the field.
References
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Journal ArticleDOI
The State of the Art in Selective Catalytic Reduction of NOx by Ammonia Using Metal‐Exchanged Zeolite Catalysts
TL;DR: An overview of the selective catalytic reduction of NOx by ammonia (NH3•SCR) over metal-exchanged zeolites is given in this paper, where a comparison of Fe•ZSM•5 catalysts prepared by different methods and research groups shows that the preparation method is not a decisive factor in determining catalytic activity.
Journal ArticleDOI
Excellent activity and selectivity of Cu-SSZ-13 in the selective catalytic reduction of NOx with NH3
TL;DR: In this paper, the performance of a Cu ion-exchanged SSZ-13 zeolite in the selective catalytic reduction (SCR) of NO x with NH 3 was observed, in comparison with Cu-beta and ZSM-5 zeolites.
Journal ArticleDOI
The ammonia selective catalytic reduction activity of copper-exchanged small-pore zeolites
TL;DR: The NH3-SCR activity of small-pore zeolites, such as Cu-SSZ-13 and Cu-SAPO-34, was investigated using a high-throughput reactor system in this article.
Journal ArticleDOI
Effects of hydrothermal aging on NH3-SCR reaction over Cu/zeolites
TL;DR: In this article, the effects of hydrothermal treatment on model Cu/zeolite catalysts were investigated to better understand the nature of Cu species for the selective catalytic reduction of NO{sub x} by NH{sub 3}.
Journal ArticleDOI
Structure–activity relationships in NH3-SCR over Cu-SSZ-13 as probed by reaction kinetics and EPR studies
Feng Gao,Eric D. Walter,Eric M. Karp,Jinyong Luo,Russell G. Tonkyn,Ja Hun Kwak,János Szanyi,Charles H. F. Peden +7 more
TL;DR: In this article, the EPR and temperature-programmed reduction (TPR) results were used to identify the locations of the Cu2+ ion locations and the reaction kinetics of the NH3-SCR reaction.