Effect of calcination on Co-impregnated active carbon

Journal Article · Mon Nov 01 00:00:00 EST 1993 · Journal of Colloid and Interface Science; (United States)

DOI:https://doi.org/10.1006/jcis.1993.1448· OSTI ID:5836478

Bekyarova, E; Mehandjiev, D ^[1]

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1. Bulgarian Academy of Sciences, Sofia (Bulgaria). Inst. of General and Inorganic Chemistry

Active carbon (AC) from apricot shells with known characteristics has been impregnated with a 9.88% Co(NO[sub 3])[sub 2] [center dot] 6H[sub 2]O solution. The samples are destroyed in air at 200, 300, 400, and 550 C. The processes accompanying the thermal treatment are studied by DTA. Two processes are established during calcination of Co-impregnated active carbon: (i) destruction of the support as a result of oxidation catalyzed by the impregnated cobalt and (ii) interaction of the active phase (Co[sub 3]O[sub 4]) with the support (AC), during which Co[sub 3]O[sub 4] is reduced to CoO and Co. The presence of Co[sub 3]O[sub 4], and CoO phases is proved by X-ray measurements, while that of metal Co is established by magnetic measurements. The porous structure changes are investigated by adsorption studies. The characterization of the samples is performed by physical adsorption of N[sub 2] (77.4 K) and CO[sub 2] (273 K). The poresize distribution curves are plotted over the range 0.4--10 nm by the methods of Pierce (for the mesopores) and Medek (for the micropores). The micropore volume is determined by two independent methods: t/F method and D-R plot. The results from adsorption studies indicate a decrease of S[sub BET], V[sub mi], and, especially, the supermicropores of the samples.

• OSTI ID: 5836478
• Journal Information: Journal of Colloid and Interface Science; (United States), Vol. 161:1; ISSN 0021-9797
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ACTIVATED CARBON
CALCINATION
CATALYST SUPPORTS
MORPHOLOGICAL CHANGES
CATALYSTS
COBALT NITRATES
COBALT
COBALT OXIDES
DIFFERENTIAL THERMAL ANALYSIS
IMPREGNATION
PORE STRUCTURE
REDUCTION
SORPTIVE PROPERTIES
SURFACE AREA
ADSORBENTS
CARBON
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
DECOMPOSITION
ELEMENTS
METALS
MICROSTRUCTURE
NITRATES
NITROGEN COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
SURFACE PROPERTIES
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties