Carbonization of nickel catalysts and its effect on methane dry reforming

Authors: V.Yu. Bychkov, Yu.P. Tyulenin, A.A. Firsova, E.A. Shafranovsky, A.Ya. Gorenberg, V.N. Korchak

Abstract:
Formation and reactivity of carbon in Ni/Al₂O₃ catalysts of methane dry reforming (MDR) have been studied at their interaction with CH₄, CO₂, H₂ or CH₄–CO₂ mixture using thermogravimetry and massspectrometry. Temperature ranges of carbon accumulation and removal have been established, with a temperature hysteresis of carbon accumulation being observed in CH₄–CO₂ mixture. The primary deposited carbon blocks MDR activity, but the deactivation is reversible under MDR conditions. The primary carbon transforms into the secondary nanofiber carbon which is stable under MDR conditions and less blocks MDR activity. Effect of Ni catalysts deactivation because of carbonization can be reduced, if atthe initial stage the catalyst does not contact with the reaction mixture attemperatures below 700^◦C. The rate of carbon accumulation was increased with increasing Ni particle size from 2 to 5 nm.

Keywords:
CO₂ reforming of methane
Nickel catalysts
Thermogravimetry
Carbon deposition
Catalyst deactivation
Carbon nanofibers

Published in: Applied catalysis A: General  (Volume 453, Pages 1-402, 26 February 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Carbonization of nickel catalysts and its effect on methane dry reforming

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