FORMATION OF SMALL COBALT CLUSTERS FROM CONAY BY REDUCTION WITH H2 AND CONSECUTIVE H2-O2 TREATMENTS

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In order to raise the degree of reduction and promote the formation of zerovalent cobalt clusters, repetitive treatments of CoNaY with hydrogen and oxygen were carried out. The intensity of FMR (ferromagnetic resonance) band of CoNaY reduced for 36 h at 773 K with intermittent oxygen treatments was twice as much as that of CoNaY reduced only with hydrogen. This fact meant that reduction of CoNaY with H2-O2 treatments favored to produce zerovalent cluster due to the increase in the mobility of Co2+ ions in CoNaY. The size of clusters is so small that such conventional methods as hydrogen chemisorption, X-ray diffraction, and TEM can not detect the quantity of zerovalent cobalt clusters. FMR spectroscopy, H-2-consumption measurement, and catalytic probe reaction method were used to measure the degree of reduction and were correlated well with one another.
Publisher
CHEMICAL SOC JAPAN
Issue Date
1991
Language
English
Article Type
Article
Keywords

CARBON-MONOXIDE HYDROGENATION; Y-TYPE ZEOLITES; CO HYDROGENATION; FERROMAGNETIC-RESONANCE; PRODUCT DISTRIBUTION; SURFACE-COMPOSITION; CATALYTIC ACTIVITY; NICKEL; IRON; METHANATION

Citation

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, v.64, no.4, pp.1370 - 1377

ISSN
0009-2673
DOI
10.1246/bcsj.64.1370
URI
http://hdl.handle.net/10203/250786
Appears in Collection
CBE-Journal Papers(저널논문)
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