✦ LIBER ✦

Prevention of catalyst deactivation caused by coke formation in the methanation of carbon oxides

✍ Scribed by Tomoyuki Inui; Takashi Hagiwara; Yoshinobu Takegami

Publisher: Elsevier Science
Year: 1982
Tongue: English
Weight: 496 KB
Volume: 61
Category: Article
ISSN: 0016-2361
DOI: 10.1016/0016-2361(82)90176-4

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✦ Synopsis

Prevention of catalyst deactivation in carbon monoxide methanation on a highly active Ni-based composite catalyst has been investigated. The composite catalyst, Ni-La,O,-Ru supported on silica, has greater activity than that of a Ni catalyst, but the decrease of the catalyst activity with reaction time is greater than that of the Ni catalyst, especially when the CO conversion is low. The reason for this behaviour is found in the relation between the amount of surfacecarbon species and the degree of deactivation. When the CO methanation reaction is operated at above the temperature of complete CO conversion, catalyst deactivation is avoided. At such high temperatures the amount of surfacecarbon species is small. The catalyst deactivation is considerably suppressed with a low concentration, e.g. l-3 kPa, of additional CO2 or CO,+ H20. The cause of this suppression is considered to be the renewal of the covered surface with the carbon-species by the competitive adsorption of these additives.

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