✦ LIBER ✦

Formation and gasification of carbon deposits on NiSiO2 catalysts

✍ Scribed by E.G.M. Kuijpers; J.W. Geus

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 563 KB
Volume: 62
Category: Article
ISSN: 0016-2361
DOI: 10.1016/0016-2361(83)90189-8

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✦ Synopsis

The deposition of carbon from CH* and CO on Ni/SiOz catalysts was studied in pulse-flow experiments as well as volumetrically with a low-field magnetic permeameter. It was found that carbon, deposited from CH* according to: CH, -+ C + 4H, gave rise to the formation of nickel carbide, N&C, only at the surface of the nickel particles (T < 300°C). However, carbon, deposited from CO according to: 2C0 -+ C + CO*, led to the formation of a bufk nickel carbide as well as dissolution of carbon interstitially. The reactivity of the carbon thus deposited was studied with both H, and H,O. The rate of reaction with hydrogen appeared to be a function of temperature: the rate passed through a maximum at 200°C and dropped steeply above 300°C. The only product of the reaction was CH,. The reaction with Hz0 produced besides CH,, CO, and (at low carbon surface coverages) HP.

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