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  • Springer  (56)
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  • 1
    Electronic Resource
    Electronic Resource
    Alkane oxidation on isolated Cu2+ ions in zeolitic matrix: a relation between catalytic activity and Cu2+-site local topography (1991)
    Springer
    Catalysis letters 10 (1991), S. 289-296 
    Details
    ISSN: 1572-879X
    Keywords: ESR ; selective oxidation ; copper-catalysis ; zeolite ; ethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Catalytic ethane oxidation, with O2, using H-ZSM-5 and H-mordenite containing different discrete types of isolated Cu(II) cations was studied. An ESR spectroscopic study was carried out on copper ion coordination in zeolites. It was shown that the intrinsic activity of Cu(II) ion depends strongly on the Cu2+-site local topography. Covalent-bonded Cu(II) cations in the most coordinatively unsaturated square-planar coordination in H-ZSM-5 demonstrated the highest activity in C2H6 complete oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00772083
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  • 2
    Electronic Resource
    Electronic Resource
    Direct observation of transition state selectivity: Low temperature cyclization of dienes inside H-mordenite and H-ZSM-5 channels (1988)
    Springer
    Catalysis letters 1 (1988), S. 311-316 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The analysis of the ESR-spectra obtained upon the sorption of dienes and olefins on H-mordenite shows that molecules of dienes are not very reactive in oligomerization inside HM-channels. Warming of HM with presorbed 1,4-pentadiene or 1,5-hexadiene results in the selective cyclization of molecules inside the HM channels. In contrast cyclization of dienes does not take place inside the narrower channels of H-ZSM5 in spite of the fact that the nature of both acid and redox sites in these two zeolites is the same. This clearly demonstrates the reality of transition state selectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00774873
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  • 3
    Electronic Resource
    Electronic Resource
    Properties and structure of NiO-A14O3 catalysts communication 1. Effect of composition and conditions of thermal treatment on activity and selectivity (1958)
    Springer
    Russian chemical bulletin 7 (1958), S. 795-801 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. Study of the specific activities of Al2O3- NiO catalysts roasted at 400–750° for the decomposition of i-C3H7OH showed that there is optimum activity with respect to composition for NiO contents ranging from 5–15 moles per cent. 2. It was shown that the selectivities of the catalysts studied depend on composition; over a wide range of NiO contents only dehydration occurs, which indicates absence of free NiO. Dehydrogenating power appears only in catalysts of high NiO content and indicates the formation of a free-NiO phase. 3. It was shown that in coprecipitated NiO-A12O3 catalysts it is possible for the spinel NiAl2O4 to be formed at a temperature as low as 400° because of the intermolecular dehydration of the hydroxides. 4. The relation between specific surface and temperature of roasting was determined for these catalysts over the range 400–900°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01150799
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  • 4
    Electronic Resource
    Electronic Resource
    Properties and structure of NiO-Al2O3 catalysts 3. A study of the relation between composition, magnetic properties and activity (1958)
    Springer
    Russian chemical bulletin 7 (1958), S. 1024-1029 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In a magnetic study of the coprecipitated NiO-Al2O3 catalysts containing up to 59 mole % NiO, which had been subjected to a thermal treatment at 400
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00912339
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  • 5
    Electronic Resource
    Electronic Resource
    Phase composition, structure, and magnetic properties of coprecipitated ferric oxide-alumina gels (1960)
    Springer
    Russian chemical bulletin 9 (1960), S. 154-162 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. An investigation was made of the effect of component ratio and thermal treatment conditions on the phase composition and magnetic properties of coprecipitated ferric oxide-alumina gels containing up to 57 mol. percent of 2. Gels fired at 400° contained only one crystalline phase, namely, a saturated solid solution of Fe2O3 (8 mol. %@#@) inγ-Al2O3, while those fired at 600 and 750° also contained a solid solution of Al2O3 inα-Fe2O3. Noγ-Fe2O3 was detected either by x-ray diffraction or magnetic methods. 3. Fe2O3 reduced the temperature of the phase transition ofγ-Al2O3, in which it was dissolved, toα-Al2O3 and this transition occurred even at 1000°. 4. All gels fired at 400°, gels with 7 and 18 mol. % of Fe2O3 fired at 600°, and the gel with 8% of Fe2O3 fired at 750° were paramagnetic and obeyed the Curie-Weiss law with a positive value for the Weiss constant. Their paramagnetism is explained by the formation ofβ-Fe2O3 or more complex transition phases. All the other gels were ferromagnetic. 5. Catalytic reactions of isopropyl alcohol on the gels studied at 260–290° led to an increase in the ferromagnetism as a result of the formation of Fe3O4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00942883
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  • 6
    Electronic Resource
    Electronic Resource
    Catalytic and magnetic properties of NiO-MgO (1960)
    Springer
    Russian chemical bulletin 9 (1960), S. 403-409 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. An investigation was made of the effect of the composition of coprecipitated NiO-MgO catalysts fired at 400, 600, and 750° on their magnetic and catalytic properties in the decomposition of i-C3H7OH. 2. The catalysts studied obeyed the Curie-Weiss law with the values of the Weiss constant increasing with the NiO content and a fall in sample firing temperature; the magnetic moment for all the samples was independent of NiO concentration and corresponded to the ion Ni2+ (μ=2.8–3.1 μ3) within the limits of experimental error. 3. The specific catalytic (dehydrogenating) activity of preparations with small amounts of NiO added (up to 5 weight % of Ni) was much higher than that of pure MgO; a second increase in catalytic activity occurred at Ni 〉 24 weight % (∼31% NiO) and is explained purely by the concentration factor. 4. The high activity of binary catalysts in the region of low NiO concentrations is explained on the basis of the semiconductor properties of NiO and MgO by the transfer of electrons from the valence zone of MgO to Ni2+, which produces a corresponding fall in the Fermi potential. The possibility of such a transfer of electrons was demonstrated experimentally on the example of Ni-ZnO and NiO-CdO; the transfer of electrons of CdO and ZnO (p-semiconductors) to the Ni2+ ion led to a decrease in the magnetic moment of this ion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00912257
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  • 7
    Electronic Resource
    Electronic Resource
    Properties and structure of NiO-Al2O3 catalysts (1960)
    Springer
    Russian chemical bulletin 9 (1960), S. 592-596 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary It was shown by x-ray and magnetochemical methods that the formation of spinel from coprecipitated nickel and aluminum hydroxides by thermal treatment consists of the following stages: a) formation of a solid solution of nickel and aluminum hydroxides or nickel hydroaluminate by coprecipitation; b) decomposition of the gel and crystal formation in the range 100–250°, accompanied by a sharp decrease in the water content; c) rearrangement of the crystal lattice at 250–300° to a cubic, face-centered spinel-type lattice; d) ordering of the crystal lattice at 300–700° without noticeable redistribution of Ni2+ ions, accompanied by a gradual decrease in water content; and e) further ordering of the crystal lattice at 700–1200° with redistribution of Ni2+ ions in accordance with the reversibility coefficient of spinel NiAl2O4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00910788
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  • 8
    Electronic Resource
    Electronic Resource
    Oxidative polycondensation of p-diet hynylbenzene (1960)
    Springer
    Russian chemical bulletin 9 (1960), S. 891-891 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179200
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  • 9
    Electronic Resource
    Electronic Resource
    Carbonylation of piperidine with carbon monoxide in the presence of CuNaA-zeolite catalyst (1974)
    Springer
    Russian chemical bulletin 23 (1974), S. 2037-2038 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions Zeolite CuNaA at 200–300° and a CO pressure of 100 atm is an active and stable catalyst for the carbonylation of piperidine to formylpiperidine (30–40% yield).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00922816
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  • 10
    Electronic Resource
    Electronic Resource
    Catalytic properties of chelate polymers (1963)
    Springer
    Russian chemical bulletin 12 (1963), S. 1044-1045 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. Chelate polymers of the type $$H[R \backslash Me/]_n RH,$$ where R is a quinazarine group, catalyze the polymerization of styrene. 2. With respect to the chelate-forming metal, the activity of the polymers falls into the series Cu2+ 〉 Mn2+ 〉 Ni2+. The polychelates with Zn2+ and Co2+ were catalytically inactive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00845495
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