Solution-Phase Metal Atom Preparation of Catalytically Active Zeolite-Encapsulated Metal Clusters; Characterization and Application to the Selective Reduction of CO to Butene

1983 ◽  
Vol 22 (8) ◽  
pp. 624-625 ◽  
Author(s):  
Linda F. Nazar ◽  
Geoffrey A. Ozin ◽  
François Hugues ◽  
John Godber ◽  
Denis Rancourt
Keyword(s):  
Metal Atom ◽  
Metal Clusters ◽  
Selective Reduction ◽  
Solution Phase ◽  
Catalytically Active

scholarly journals Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4885
Author(s):  
Aneta Święs ◽  
Małgorzata Rutkowska ◽  
Andrzej Kowalczyk ◽  
Urbano Díaz ◽  
Antonio E. Palomares ◽  
...  
Keyword(s):  
Copper Oxide ◽  
Ammonia Oxidation ◽  
Catalytic Reduction ◽  
Surface Acidity ◽  
Selective Reduction ◽  
Exchange Method ◽  
Copper Species ◽  
Selective Catalytic Oxidation ◽  
Catalytically Active ◽  
Copper Cations

Ferrierites and their delaminated forms (ITQ-6), containing aluminum or titanium in the zeolite framework, were synthetized and modified with copper by an ion-exchange method. The obtained samples were characterized with respect to their chemical composition (ICP-OES), structure (XRD, UV-Vis DRS), textural parameters (N2-sorption), surface acidity (NH3-TPD), form and reducibility of deposited copper species (UV-Vis DRS and H2-TPR). Ferrierites and delaminated ITQ-6 zeolites modified with copper were studied as catalysts for the selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO). It was shown that aggregated copper oxide species, which were preferentially formed on Ti-zeolites, were catalytically active in direct low-temperature ammonia oxidation to NO, while copper introduced into Al-zeolites was present mainly in the form of monomeric copper cations catalytically active in selective reduction of NO by ammonia to dinitrogen. It was postulated that ammonia oxidation in the presence of the studied catalysts proceeds according to the internal-selective catalytic reduction mechanism (i-SCR) and therefore the suitable ratio between aggregated copper oxide species and monomeric copper cations is necessary to obtain active and selective catalysts for the NH3-SCO process. Cu/Al-ITQ-6 presented the best catalytic properties possibly due to the most optimal ratio of these copper species.

Metal Atom/Vapor Approaches to Active Metal Clusters/Particles

Active Metals ◽  
2007 ◽  
pp. 237-278 ◽  
Author(s):  
Kenneth J. Klabunde ◽  
Galo Cardenas-Trivino
Keyword(s):  
Metal Atom ◽  
Metal Clusters ◽  
Active Metal

Solution-phase catalytic synthesis, characterization and growth kinetics of Ag2S–CdS matchstick-like heteronanostructures

2014 ◽  
Vol 43 (10) ◽  
pp. 3990-3998 ◽  
Author(s):  
Junli Wang ◽  
Hui Feng ◽  
Kangmin Chen ◽  
Weiling Fan ◽  
Qing Yang
Keyword(s):  
Growth Kinetics ◽  
Catalytic Synthesis ◽  
Solution Phase ◽  
Cds Nanorods ◽  
Catalytically Active ◽  
Kinetics Of

Ag2S nanocrystals are catalytically active in the growth of CdS nanorods in oleylamine, and the reaction yields Ag2S–CdS matchstick-like heteronanostructures.

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