Selective Reduction of Nitric Oxide with Methane on Gallium and Indium Containing H-ZSM-5 Catalysts: Formation of Active Sites by Solid-State Ion Exchange

1996 ◽  
Vol 161 (1) ◽  
pp. 465-470 ◽  
Author(s):  
E. Kikuchi ◽  
M. Ogura ◽  
I. Terasaki ◽  
Y. Goto
Keyword(s):  
Nitric Oxide ◽  
Solid State ◽  
Ion Exchange ◽  
Active Sites ◽  
Selective Reduction

Influence of the preparation method on the selective reduction of nitric oxide over Cu-ZSM-5. Nature of the active sites

1994 ◽  
Vol 4 (2-3) ◽  
pp. 199-211 ◽  
Author(s):  
Zakaria Chajar ◽  
Michel Primet ◽  
Hélène Praliaud ◽  
Miche`le Chevrier ◽  
Catherine Gauthier ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Active Sites ◽  
Preparation Method ◽  
Selective Reduction

Al-free Fe-beta as a robust catalyst for selective reduction of nitric oxide by ammonia

2016 ◽  
Vol 6 (23) ◽  
pp. 8325-8335 ◽  
Author(s):  
Song Song ◽  
Guangjun Wu ◽  
Weili Dai ◽  
Naijia Guan ◽  
Landong Li
Keyword(s):  
Nitric Oxide ◽  
Solid State ◽  
Selective Reduction ◽  
Post Synthesis

Al-free Fe-beta prepared via a post-synthesis solid-state metallation route is established as an active and durable catalyst for NH3-SCR.

scholarly journals Ultrasound-Assisted Preparation of Mo/ZSM-5 Zeolite Catalyst for Non-Oxidative Methane Dehydroaromatization

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 313
Author(s):  
Heidy Ramirez-Mendoza ◽  
Mafalda Valdez Lancinha Pereira ◽  
Tom Van Gerven ◽  
Cécile Lutz ◽  
Ignacio Julian
Keyword(s):  
Catalytic Activity ◽  
Ion Exchange ◽  
Active Sites ◽  
Chemical Properties ◽  
Successful Implementation ◽  
Metal Dispersion ◽  
Zeolite Framework ◽  
Dispersed Catalysts ◽  
Methane Dehydroaromatization ◽  
Ultrasound Assisted

The activity and selectivity of Mo/ZSM-5, benchmarking catalyst for the non-oxidative dehydroaromatization of methane, strongly depend on the cluster size, spatial distribution, and chemical environment of the Mo-based active sites. This study discloses the use of an ultrasound-assisted ion-exchange (US-IE) technique as an alternative Mo/ZSM-5 synthesis procedure in order to promote metal dispersion along the zeolite framework. For this purpose, a plate transducer (91.8 kHz) is employed to transmit the ultrasonic irradiation (US) into the ion-exchange reactor. The physico-chemical properties and catalytic activity of samples prepared under the said irradiation procedure and traditional impregnation (IWI) method are critically evaluated. Characterization results suggest that US neither affects the crystalline structure nor the particle size of the parent zeolite. However, US-IE promotes molybdenum species dispersion, avoids clustering at the external fresh zeolite surface and enhances molybdate species anchoring to the zeolite framework with respect to IWI. Despite the improved metal dispersion, the catalytic activity between catalysts synthesized by US-IE and IWI is comparable. This suggests that the sole initial dispersion enhancement does not suffice to boost the catalyst productivity and further actions such ZSM-5 support and catalyst pre-conditioning are required. Nevertheless, the successful implementation of US-IE and the resulting metal dispersion enhancement pave the way toward the application of this technique to the synthesis of other dispersed catalysts and materials of interest.

scholarly journals Evaluation of Cu/SAPO-34 Catalysts Prepared by Solid-State and Liquid Ion-Exchange Methods for NOx Removal by NH3-SCR

ACS Omega ◽  
2019 ◽  
Vol 4 (12) ◽  
pp. 14699-14713 ◽  
Author(s):  
Maitane Urrutxua ◽  
Beñat Pereda-Ayo ◽  
Unai De-La-Torre ◽  
Juan R. González-Velasco
Keyword(s):  
Solid State ◽  
Ion Exchange ◽  
Nox Removal ◽  
Nh3 Scr

The Role of Protons and Formation Cu(NH3)2+ During Ammonia-Assisted Solid-State Ion Exchange of Copper(I) Oxide into Zeolites

2018 ◽  
Vol 62 (1-4) ◽  
pp. 100-107 ◽  
Author(s):  
Peter N. R. Vennestrøm ◽  
Lars F. Lundegaard ◽  
Christoffer Tyrsted ◽  
Dmitriy A. Bokarev ◽  
Alina I. Mytareva ◽  
...  
Keyword(s):  
Solid State ◽  
Ion Exchange
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