Active Sites and Induction Period of Fe/ZSM-5 Catalyst in Methane Dehydroaromatization

ACS Catalysis ◽  
2021 ◽  
pp. 6771-6786
Author(s):  
Yu Gu ◽  
Pingping Chen ◽  
Xiaohui Wang ◽  
Yuchao Lyu ◽  
Wanrong Liu ◽  
...  
Keyword(s):  
Induction Period ◽  
Active Sites ◽  
Methane Dehydroaromatization

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.

Active sites of the methane dehydroaromatization catalyst W-ZSM-5: An HRTEM study

2008 ◽  
Vol 49 (1) ◽  
pp. 110-114 ◽  
Author(s):  
V. V. Kozlov ◽  
V. I. Zaikovskii ◽  
A. V. Vosmerikov ◽  
L. L. Korobitsyna ◽  
G. V. Echevskii
Keyword(s):  
Active Sites ◽  
Methane Dehydroaromatization

Active Sites in Mo/HZSM-5 Catalysts for Nonoxidative Methane Dehydroaromatization

2020 ◽  
pp. 255-274
Author(s):  
Sonit Balyan ◽  
Puneet Gupta ◽  
Tuhin S. Khan ◽  
K.K. Pant ◽  
M. Ali Haider
Keyword(s):  
Active Sites ◽  
Methane Dehydroaromatization

Properties and deactivation of the active sites of an MoZSM-5 catalyst for methane dehydroaromatization: Electron microscopic and EPR studies

2006 ◽  
Vol 47 (3) ◽  
pp. 389-394 ◽  
Author(s):  
V. I. Zaikovskii ◽  
A. V. Vosmerikov ◽  
V. F. Anufrienko ◽  
L. L. Korobitsyna ◽  
E. G. Kodenev ◽  
...  
Keyword(s):  
Active Sites ◽  
Electron Microscopic ◽  
Methane Dehydroaromatization

Studies of the Active Sites for Methane Dehydroaromatization Using Ultrahigh-Field Solid-State 95Mo NMR Spectroscopy

2009 ◽  
Vol 113 (7) ◽  
pp. 2936-2942 ◽  
Author(s):  
Jian Zhi Hu ◽  
Ja Hun Kwak ◽  
Yong Wang ◽  
Charles H. F. Peden ◽  
Heng Zheng ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Active Sites ◽  
Ultrahigh Field ◽  
Methane Dehydroaromatization

scholarly journals Investigating the Catalytic Active Sites of Mo/HZSM-5 and Their Deactivation During Methane Dehydroaromatization

2020 ◽  
Author(s):  
Ning Wang ◽  
Xinglong Dong ◽  
Lingmei Liu ◽  
Dali Cai ◽  
Jianjian Wang ◽  
...  
Keyword(s):  
Active Sites ◽  
Methane Dehydroaromatization ◽  
Catalytic Active Sites

The State of the Active Sites and Deactivation of Mo-ZSM-5 Catalysts of Methane Dehydroaromatization

2005 ◽  
Vol 404 (4-6) ◽  
pp. 201-204 ◽  
Author(s):  
V. I. Zaikovskii ◽  
A. V. Vosmerikov ◽  
V. F. Anufrienko ◽  
L. L. Korobitsyna ◽  
E. G. Kodenev ◽  
...  
Keyword(s):  
Active Sites ◽  
The State ◽  
Methane Dehydroaromatization

Direct observation of the active sites in methane dehydroaromatization by NMR

Chem ◽  
2021 ◽  
Vol 7 (6) ◽  
pp. 1424-1427
Author(s):  
Meng Wang ◽  
Dequan Xiao ◽  
Ding Ma
Keyword(s):  
Direct Observation ◽  
Active Sites ◽  
Methane Dehydroaromatization
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