NDLI: Carbon monoxide hydrogenation in the mode of Ru/Al$_{2}$O$

Content Provider	Springer Nature Link
Author	Kipnis, M. A. Samokhin, P. V. Volnina, E. A.
Copyright Year	2013
Abstract	The specifics of CO hydrogenation over a 5%Ru/Al$_{2}$O$_{3}$ catalyst in a flow reactor at a pressure of 1.5 MPa has been considered. The feed gas mixture has been composed of (vol %) 30.5 CO, 2.3 CO$_{2}$, 65 H$_{2}$, and N$_{2}$ as the rest. The CO methanation reaction readily passes to the external-diffusion regime—catalyst surface ignition (CSI) mode—either by heating the catalyst in the reaction medium or by replacing H$_{2}$ with the reactant gas having a temperature above the critical ignition temperature. On passing to the CSI mode, the temperature at the entrance to the catalyst bed and the methane content at the reactor outlet abruptly increase, the yield of CO$_{2}$ produced via the water-gas shift reaction increases, and the CO content drops to zero. Under the CSI regime, temperature oscillations with a period of 3–5 min and an amplitude of ∼3°C are observed, which are sustained during catalyst cooling until the extinction of the reaction. A comparison of the product compositions at the reactor outlet in the cases of the “thick” (20 mm) and “thin”(3 mm) catalyst bed has shown that the reverse water-gas shift, an endothermic reaction, occurs in lower, colder layers of the thick bed. As a result, the extinction of the reaction is faster in the thick than in the thin bed. Methanation of CO is accompanied by the Fischer-Tropsch reaction: a variety of carbon compounds are formed with their yield being decreased on passing to the CSI mode.
Starting Page	225
Ending Page	232
Page Count	8
File Format	PDF
ISSN	00231584
Journal	Kinetics and Catalysis
Volume Number	54
Issue Number	2
e-ISSN	16083210
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2013-04-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Catalysis Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis Modeling and Simulation Computer Science Applications

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