Citation: Christiaan H. L. Tempelman, Xiaochun Zhu, Emiel J. M. Hensen. Activation of Mo/HZSM-5 for methane aromatization[J]. Chinese Journal of Catalysis, ;2015, 36(6): 829-837. doi: 10.1016/S1872-2067(14)60301-6 shu

Activation of Mo/HZSM-5 for methane aromatization

1.
Laboratory of Inorganic Materials Chemistry, Schuit Institute of Catalysis, Eindhoven University of Technology, Den Dolech 2, 5612 AZ Eindhoven, The Netherlands

Corresponding author: Emiel J. M. Hensen,
Received Date: 7 December 2014
Available Online: 29 January 2015
Fund Project: This work was supported by the European Union through the EU-FP7 NEXT-GTL consortium (NMP3-LA-2009-229183). (NMP3-LA-2009-229183)

The effect of Mo/HZSM-5 pretreatment at 973 K in inert (He), oxidizing (artificial air), and carburizing (CH₄/He mixture) atmospheres on its performance in non-oxidative methane dehydroaromatization (MDA) was investigated. The effect of post-synthesis silylation on deactivation of external acid sites was also studied. Precarburization resulted in increased aromatic selectivity and improved catalyst stability. The benzene selectivity was the highest for the silylated Mo/HZSM-5 catalyst (benzene + naphthalene selectivity after 1 h on stream was close to 100%). The deactivation of precarburized zeolites was less pronounced than that of zeolites heated in air or He. During heating in air or He, larger fractions of the molybdenum oxide species diffused into the micropores than during heating in methane. Carburization of the molybdenum oxide species in the micropores during MDA resulted in the formation of molybdenum carbide particles, and these contributed to pore blocking, making the Brønsted acid sites inaccessible. The formation of molybdenum carbides during heating in methane resulted in a less mobile Mo phase. It is argued that the presence of molybdenum carbide particles in the micropores contributes to rapid catalyst deactivation, in addition to the formation of hard coke on the external surface.
- Methane aromatization,
- Molybdenum,
- HZSM-5,
- Pretreatment,
- Carburization,
- Silylation
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