ISSN:
1573-8310
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
,
Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
Notizen:
Conclusions 1. The effect of the active components (Fe2O3, MoO3, NiO, CoO, Cr2O3, V2O5, and MnO2) of alumina-oxide catalysts was studied on the change in the structuromechanical properties of the latter as the result of heat treatment at 800, 900, and 1000°C for 10–12 h. 2. It was found that the catalysts' pore structure changed differently depending on the chemical composition. Depending on the extent of the phase transitions of the carrier, the specific surface of the samples, heated at 1000 °C, decreased from 110 m2/g for the alumina-nickel catalyst to 1 m2/g for the alumina-vanadium catalyst; the volume of the micro- and intermediate pores decreased from 0.31 to 0.07 cm3/g, respectively. 3. The mechanical strength of the majority of the catalysts that were studied was retained after the heat treatment without marked changes. The exception was the alumina-vanadium and alumina-molybdenum catalysts, for which the phase transition was accompanied by the complete loss of porosity. The assumption was put forth that this phenomenon is related to the low melting temperature for MoO3 and V2O5.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00716520
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