Effects of Si/Al ratio on Cu/SSZ-13 NH3-SCR catalysts: Implications for the active Cu species and the roles of Brønsted acidity
TLDR
In this paper, the results of a variety of catalyst characterization and reaction kinetics measurements were presented, including surface area/pore volume measurements, temperature programmed reduction by H2 (H2-TPR), NH3 temperature programmed desorption (NH3-TPD), and DRIFTS and solid-state nuclear magnetic resonance (NMR) spectroscopies.About:
This article is published in Journal of Catalysis.The article was published on 2015-11-01 and is currently open access. It has received 319 citations till now. The article focuses on the topics: Temperature-programmed reduction & SSZ-13.read more
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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
Selective Catalytic Reduction over Cu/SSZ-13: Linking Homo- and Heterogeneous Catalysis.
TL;DR: Detailed reaction kinetics are reported on low-temperature standard NH3-SCR, supplemented by DFT calculations, as strong evidence that the low-Temperature oxidation half-cycle occurs with the participation of two isolated CuI ions via formation of a transient [CuI(NH3)2]+-O2-[CuI (NH3]2]+ intermediate.
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
Methane to Methanol: Structure–Activity Relationships for Cu-CHA
Dimitrios K. Pappas,Elisa Borfecchia,Michael Dyballa,I. A. Pankin,Kirill A. Lomachenko,Andrea Martini,Matteo Signorile,Shewangizaw Teketel,Bjørnar Arstad,Gloria Berlier,Carlo Lamberti,Carlo Lamberti,Silvia Bordiga,Silvia Bordiga,Unni Olsbye,Karl Petter Lillerud,Stian Svelle,Pablo Beato +17 more
TL;DR: It is found that the CuII moieties responsible for the conversion are formed in the presence of O2 and that high temperature together with prolonged activation time increases the population of such active sites, and there is a linear correlation between the reducibility of the materials and their methanol productivity.
Journal ArticleDOI
Toward Rational Design of Cu/SSZ-13 Selective Catalytic Reduction Catalysts: Implications from Atomic-Level Understanding of Hydrothermal Stability
James Song,James Song,Yilin Wang,Eric D. Walter,Nancy M. Washton,Donghai Mei,Libor Kovarik,Mark H. Engelhard,Sebastian Prodinger,Yong Wang,Yong Wang,Charles H. F. Peden,Feng Gao +12 more
TL;DR: In this article, various Cu species, including two types of isolated active sites and CuOx clusters, were precisely quantified for samples hydrothermally aged under varying conditions, and this quantification convincingly confirms the exceptional hydrothermal stability of isolated Cu2+-2Z sites and the gradual conversion of [Cu(OH)]+-Z to Cu Ox clusters with increasing aging severity.
References
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Chemical and mechanistic aspects of the selective catalytic reduction of NOx by ammonia over oxide catalysts: A review
TL;DR: In this paper, the open literature concerning chemical and mechanistic aspects of the selective catalytic reduction of NO by ammonia (SCR process) on metal oxide catalysts is reviewed, and the results of spectroscopic studies of the adsorbed surface species, adsorption-desorption measurements, flow reactor and kinetic experiments are analyzed.
Book
High-resolution solid-state NMR of silicates and zeolites
Günter Engelhardt,Dieter Michel +1 more
TL;DR: High-Resolution NMR of Solids and Adsorbed Molecules as mentioned in this paper is a well-known technique for high-resolution NMR for solids and adsorbed molecules.
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
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.