Understanding W/H-ZSM-5 catalysts for the dehydroaromatization of methane

Tungsten is the most interesting and promising metal to replace molybdenum in methane dehydroaromatization (MDA) catalysis. Located in the same column of the periodic table, tungsten displays similar chemical features to molybdenum ( i.e. , formation and stability of oxidation states, acidity of tri...

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Published in:Catalysis science & technology 2023-05, Vol.13 (9), p.2748-2762
Main Authors: Ça layan, Mustafa, Nassereddine, Abdallah, Nastase, Stefan-Adrian F, Aguilar-Tapia, Antonio, Dikhtiarenko, Alla, Chung, Sang-Ho, Shterk, Genrikh, Shoinkhorova, Tuiana, Hazemann, Jean-Louis, Ruiz-Martinez, Javier, Cavallo, Luigi, Ould-Chikh, Samy, Gascon, Jorge
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Atomic radius
Catalysis
Catalysts
Catalytic activity
Dispersion
High temperature
Hydrodesulfurization
Isomerization
Metathesis
Methane
Molybdenum
Oxidation
Periodic table
Physics
Regeneration
Thermal stability
Tungsten
X ray absorption
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Summary:Tungsten is the most interesting and promising metal to replace molybdenum in methane dehydroaromatization (MDA) catalysis. Located in the same column of the periodic table, tungsten displays similar chemical features to molybdenum ( i.e. , formation and stability of oxidation states, acidity of trioxides, tendency toward formation of polynuclear species, atomic radii, ionic radii, etc. ) but shows higher thermal stability. The latter could be an advantage during high-temperature reaction-regeneration cycles. However, the MDA activity of W-ZSM-5 catalysts is much lower than the activity obtained with their Mo counterpart. In order to gain a further understanding of such differences in catalytic activity, we present a thorough investigation of the effect of dispersion and distribution of W sites on the zeolite, their relation with catalytic activity, and the temporal evolution of dispersion with reaction-regeneration cycles. The structure of W sites is elucidated with advanced and detailed characterization techniques, including operando X-ray absorption spectroscopy (XAS). The information obtained can help the catalysis community to design better W catalysts for MDA and other reactions ( i.e. , metathesis, hydrocarbon cracking, hydrodesulfurization, isomerization, etc. ) where this is the metal of choice. Tungsten is the most interesting and promising metal to replace molybdenum in methane dehydroaromatization (MDA) catalysis.
ISSN:2044-4753
2044-4761
DOI:10.1039/d3cy00103b