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  • 1
    Electronic Resource
    Electronic Resource
    Two classes of geochemical reducing barriers in exogenous uranium deposits (1970)
    Springer
    Atomic energy 28 (1970), S. 2-8 
    Details
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01235478
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  • 2
    Electronic Resource
    Electronic Resource
    Chromium oxide catalysts for the polymerization of ethylene (1959)
    Springer
    Russian chemical bulletin 8 (1959), S. 1041-1048 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. The activity of the catalyst depends on the relative amounts of CrVI and CrIII and on the extent of the dehydration of the aluminum silicate. The deactivation of the catalyst is due to the more complete removal of active oxygen occurring either at too high a temperature or when the supply of air is inadequate. 2. In the course of the thermal treatment of the catalyst aluminum oxide enters into chemical reaction with CrO3, and this retards the reduction of CrVI to Cr111. No interaction is observed between silicon oxide and CrO3. 3. The activation of the catalyst at high temperatures is necessary only for the dehydration of the aluminum silicate, as the maximum amount of CrVI is present before the heating and the interaction between Cr compounds and alumina starts at low temperatures (103–108°). 4. The chromium catalyst investigated has high sorptive power and is readily reduced to Cr111 under the action of high temperature and hydrocarbons. 5. Spent catalysts can be regenerated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00916673
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  • 3
    Electronic Resource
    Electronic Resource
    Polymerization of ethylene over a chromium oxide catalyst at at mospheric pressure in absence of solvent (1959)
    Springer
    Russian chemical bulletin 8 (1959), S. 345-346 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Polyethylene was prepared by the gas-phase polymerization of ethylene over a chromium oxide catalyst at ordinary pressure in absence of solvent at 110–180°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00917391
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of crystalline polyvinylcyclohexane (1961)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 52 (1961), S. 199-204 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The least known field of stereospecific polymerization is the polymerization of vinylcycloalkanes. At the same time polyvinylalkanes and especially polyvinylcycloalkanes may be of considerable interest as a new class of crystalline polyvinyl compounds. With this in mind the synthesis of polyvinylcyclohexane has been carried out and its properties have been investigated. Polymerization of vinylcyclohexane takes place in the presence of titanium tetrachloride and isobutylaluminum or of chromium oxides on aluminum silicate. The polymer obtained with different catalysts and under varying conditions (temperature, solvent, catalyst concentration, etc.) according to x-ray data has a high degree of crystallinity. The melting point is 325° and the intrinsic viscosity from 0.5 to 1.5. A characteristic feature is its good solubility in naphthenic and aromatic hydrocarbons. The structure of the polymer has been established and thermomechanical curves have been determined for polymers obtained on various catalysts.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1961.1205215726
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