Reversible nature of coke formation on Mo/ZSM-5 methane dehydroaromatization catalysts

Nikolay Kosinov (Corresponding author), Evgeny A. Uslamin, Lingqian Meng, Alexander Parastaev, Yujie Liu, Emiel J.M. Hensen

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

21 Citaten (Scopus)
74 Downloads (Pure)


Non-oxidative dehydroaromatization of methane over Mo/ZSM-5 zeolite catalysts is a promising reaction for the direct conversion of abundant natural gas into liquid aromatics. Rapid coking deactivation hinders the practical implementation of this technology. Herein, we show that catalyst productivity can be improved by nearly an order of magnitude by raising the reaction pressure to 15 bar. The beneficial effect of pressure was found for different Mo/ZSM-5 catalysts and a wide range of reaction temperatures and space velocities. High-pressure operando X-ray absorption spectroscopy demonstrated that the structure of the active Mo-phase was not affected by operation at elevated pressure. Isotope labeling experiments, supported by mass-spectrometry and 13 C nuclear magnetic resonance spectroscopy, indicated the reversible nature of coke formation. The improved performance can be attributed to faster coke hydrogenation at increased pressure, overall resulting in a lower coke selectivity and better utilization of the zeolite micropore space.

Originele taal-2Engels
Pagina's (van-tot)7068-7072
Aantal pagina's5
TijdschriftAngewandte Chemie - International Edition
Nummer van het tijdschrift21
StatusGepubliceerd - 20 mei 2019

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