CO-H sub 2 titration for the determination of super small metal surface area

A novel method is proposed for the determination of super small metal surface areas of supported metal catalysts. The method gives the amount of adsorbed CO by detecting CH{sub 4} formed during the titration of preadsorbed CO with H{sub 2} at elevated temperatures. The method was verified by using 0...

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Bibliographic Details
Published in:Journal of catalysis 1989-12, Vol.120:2
Main Authors: Komai, Shin'ichi, Hattori, Tadashi, Murakami, Yuichi
Format: Article
Language:English
Subjects:
01 COAL, LIGNITE, AND PEAT
010408 - Coal, Lignite, & Peat- C1 Processes- (1987-)
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
HYDROGENATION
MEASURING METHODS
METALS
METHANATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
SORPTION
SURFACE AREA
SURFACE PROPERTIES
TRANSITION ELEMENTS
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Summary:A novel method is proposed for the determination of super small metal surface areas of supported metal catalysts. The method gives the amount of adsorbed CO by detecting CH{sub 4} formed during the titration of preadsorbed CO with H{sub 2} at elevated temperatures. The method was verified by using 0.1% and 0.5% Pt/Al{sub 2}O{sub 3} catalysts which could be characterized by other methods. It was shown that the experimental procedure satisfies the assumptions on which the method is based and that the dispersions of both catalysts determined by the proposed method agree well with those obtained by other methods. Then the method was applied to Pt/Al{sub 2}O{sub 3} catalysts with very low Pt content (to 0.0007%, 7 ppm), and the optimum experimental condition was established for super low metal content. The dispersions thus determined were reasonable, in the range from 80 to 100%, supporting the validity of the method.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(89)90276-5