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Nickel Catalyzed Conversion of Activated Carbon into Porous Silicon Carbide

Published online by Cambridge University Press:  15 February 2011

R. Moene ,
J. Schoonman ,
M. Makkee  and
J. A. Moulijn
R. Moene
Affiliation:
Department of Chemical Process Technology, Section Industrial Catalysis, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
J. Schoonman
Affiliation:
Laboratory of Applied Inorganic Chemistry, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
M. Makkee
Affiliation:
Department of Chemical Process Technology, Section Industrial Catalysis, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
J. A. Moulijn
Affiliation:
Department of Chemical Process Technology, Section Industrial Catalysis, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
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Abstract

High surface area silicon carbide (SiC) of 31 m2/g has been synthesized by the catalytic conversion of activated carbon. The thermal stability in non-oxidizing environments is shown to be excellent; no significant sintering has been observed after ageing in nitrogen for 4 hours at 1273 K. The presence of 2v% steam or the use of air results in SiC oxidation into SiO2 and considerable sintering at 1273 K. Air oxidation of SiC is shown to cause substantial SiC conversion, viz. 60 % after 10 hours at 1273 K. Complete conversion is achieved at 1080 K in about 100 days. This rate of oxidation agrees with reports on the oxidation of non-porous Acheson SiC and Chemical Vapour Deposited SiC coatings. The use of SiC based catalysts is, therefore, limited to (1) high temperature gas phase reactions operating in the absence of oxidizing constituents (O2 or H2O) and (2) liquid phase processes at demanding pH. Syntheses of highly dispersed and highly loaded Ni/SiC catalysts are feasible by applying an ion-exchange technique, resulting in supported nickel particles of 4 nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 368: Symposium T – Synthesis and Properties of Advanced Catalytic Materials , 1994 , 75
Copyright
Copyright © Materials Research Society 1995

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References

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