New insights into catalyst deactivation and product distribution of zeolites in the methanol-to-hydrocarbons (MTH) reaction with methanol and dimethyl ether feeds

2017 ◽  
Vol 7 (13) ◽  
pp. 2700-2716 ◽  
Author(s):  
Juan S. Martinez-Espin ◽  
Magnus Mortén ◽  
Ton V. W. Janssens ◽  
Stian Svelle ◽  
Pablo Beato ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Catalyst Deactivation ◽  
Product Distribution ◽  
Zeolitic Catalyst ◽  
Methanol To Hydrocarbons

The ability of a zeolitic catalyst to dehydrate methanol to dimethyl ether affects catalyst deactivation and product distribution during the methanol-to-hydrocarbons (MTH) reaction.

scholarly journals Gallium nitride catalyzed the direct hydrogenation of carbon dioxide to dimethyl ether as primary product

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chang Liu ◽  
Jincan Kang ◽  
Zheng-Qing Huang ◽  
Yong-Hong Song ◽  
Yong-Shan Xiao ◽  
...  
Keyword(s):  
Gallium Nitride ◽  
Dimethyl Ether ◽  
High Performance ◽  
Density Functional ◽  
Value Added ◽  
Density Functional Theory Calculations ◽  
Product Distribution ◽  
Spectroscopic Studies ◽  
Direct Hydrogenation ◽  
Hydrogenation Of Co

AbstractThe selective hydrogenation of CO2 to value-added chemicals is attractive but still challenged by the high-performance catalyst. In this work, we report that gallium nitride (GaN) catalyzes the direct hydrogenation of CO2 to dimethyl ether (DME) with a CO-free selectivity of about 80%. The activity of GaN for the hydrogenation of CO2 is much higher than that for the hydrogenation of CO although the product distribution is very similar. The steady-state and transient experimental results, spectroscopic studies, and density functional theory calculations rigorously reveal that DME is produced as the primary product via the methyl and formate intermediates, which are formed over different planes of GaN with similar activation energies. This essentially differs from the traditional DME synthesis via the methanol intermediate over a hybrid catalyst. The present work offers a different catalyst capable of the direct hydrogenation of CO2 to DME and thus enriches the chemistry for CO2 transformations.

Methanol to hydrocarbons over large cavity zeolites: Toward a unified description of catalyst deactivation and the reaction mechanism

2010 ◽  
Vol 275 (1) ◽  
pp. 170-180 ◽  
Author(s):  
Morten Bjørgen ◽  
Sema Akyalcin ◽  
Unni Olsbye ◽  
Sandrine Benard ◽  
Stein Kolboe ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Catalyst Deactivation ◽  
Large Cavity ◽  
Methanol To Hydrocarbons ◽  
Unified Description

Optimization of Vapor Phase Pyridine Synthesis Hindered by Rapid Catalyst Deactivation

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Suresh Kumar Reddy Kuppi Reddy ◽  
Inkollu Sreedhar ◽  
Kondapuram Vijaya Raghavan ◽  
Shivanand Janardan Kulkarni ◽  
Machiraju Ramakrishna
Keyword(s):  
Catalyst Deactivation ◽  
A Priori ◽  
Coke Formation ◽  
Product Distribution ◽  
Combined Effects ◽  
Reactor Operation ◽  
Proper Selection ◽  
Pyridine Bases ◽  
Deactivation Process ◽  
Selection Of

The synthesis of pyridine bases from acetaldehyde, formaldehyde and ammonia through aminocyclization continues to provide the best prospect for meeting growing demand. A proper selection of catalyst and standardization of process parameters are vital to achieve a market friendly product distribution and reactor operation. In this work, the major responsible factors for enhancing the activity and selectivity of HZS-5 catalysts have been identified and their individual and combined effects on aldehyde conversion, coke formation and selectivity to pyridine formation have been assessed. A priori assessment of catalyst time on stream behavior has been achieved by modeling the catalyst deactivation process.

Approaches for minimizing catalyst deactivation in the methanol-to-hydrocarbons reaction over ZSM-5 catalysts

2020 ◽  
Author(s):  
José Valecillos ◽  
Eva Epelde ◽  
Idoia Hita ◽  
Andrés T. Aguayo ◽  
Javier Bilbao ◽  
...  
Keyword(s):  
Catalyst Deactivation ◽  
Methanol To Hydrocarbons

scholarly journals Hierarchical H-MOR Zeolite Supported Vanadium Oxide for Dimethyl Ether Direct Oxidation

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 628 ◽  
Author(s):  
Wenfeng Wang ◽  
Xiujuan Gao ◽  
Ru Feng ◽  
Qi Yang ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Pore Structure ◽  
Dimethyl Ether ◽  
Active Sites ◽  
Synthesis Method ◽  
Product Distribution ◽  
Acid Sites ◽  
Synthesis Methods ◽  
Direct Oxidation ◽  
Post Synthesis

A series of hierarchical H-MOR zeolites with different pore structure were designed and synthesized by alkaline and alkaline-acid post-synthesis methods. The catalytic performance of hierarchical H-MOR zeolite-supported vanadium oxide was investigated for dimethyl ether (DME) direct oxidation. Different pore structures apparently affect the distribution of oxidation product distribution, especially the selectivity of DMMx and CO. The formation of mesopores for 10%V2O5/deAlmm-H-MOR markedly improved the DMMx selectivity up to 78.2% from 60.0%, and more notably, CO selectivity dropped to zero compared to that of 10%V2O5/H-MOR. The hierarchical H-MOR zeolites were confirmed to be successfully prepared by the post-synthesis method. Due to the presence of mesoporous structure, the dispersion of vanadium oxide species was enhanced, which could improve the reducibility of vanadium oxide species and also make better contact with the acid sites of zeolite to exert the synergistic effect of the bifunctional active sites. More importantly, the creation of mesopores was proved to be favorable to the mass transfer of intermediate and products to avoid the occurrence of secondary reaction, which could effectively suppress the formation of by-products. This work is helpful for us to provide a novel insight to design the catalyst with suitable pore structure to effectively synthesize diesel fuel additives from DME direct oxidation.

scholarly journals A Method for Assessing Catalyst Deactivation: A Case Study on Methanol-to-Hydrocarbons Conversion

ACS Catalysis ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 7065-7072 ◽  
Author(s):  
Brandon L. Foley ◽  
Blake A. Johnson ◽  
Aditya Bhan
Keyword(s):  
Catalyst Deactivation ◽  
Methanol To Hydrocarbons
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