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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of vanadium oxide catalysts supported on titania-zirconia by solid-state vanadium-51 and proton NMR spectroscopy (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 7076-7078 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100196a043
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  • 2
    Electronic Resource
    Electronic Resource
    Study of the V2O5-Al2O3 interaction during ultra-high intensity grinding (1992)
    Springer
    Catalysis letters 13 (1992), S. 261-266 
    Details
    ISSN: 1572-879X
    Keywords: Vanadia ; alumina ; grinding ; ESR ; NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ultrahigh intensity grinding of mechanical mixtures of V2O5 with γ-Al2O3 at ambient temperature was found to create vanadyl complexes with ESR spectral parameters identical to those of vanadia-alumina samples prepared by impregnation methods. No interaction was found after intensive grinding of γ-Al2O3 with V2O4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770998
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of silica-supported vanadia-promoted rhodium catalysts by51V-NMR spectroscopy (1992)
    Springer
    Catalysis letters 13 (1992), S. 203-211 
    Details
    ISSN: 1572-879X
    Keywords: Rhodium ; vanadia ; promoter effect ; 51V-solid state NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Vanadium oxide promoted Rh/SiO2 catalyst precursors which were calcined at 573, 773, 973 and 1173 K, were characterized by51V-NMR. V2O5 is present in all materials and RhVO4 is formed at 1173 K. An additional interaction species with vanadium in distorted tetrahedral oxygen environment is found after calcination at 973 K. These phases might have relevance for catalytic promotion of reduced Rh° metal catalysts by VOx. In addition, distorted tetrahedral VO4 species which are capable of interacting with water molecules (V2 species) and distorted octahedral species having water molecules in their coordination sphere (V5 species) have been detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770992
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  • 4
    Electronic Resource
    Electronic Resource
    Long-term stability of the V2O5/Al2O3 catalyst for the selective reduction of nitrogen oxides (1994)
    Springer
    Catalysis letters 28 (1994), S. 25-31 
    Details
    ISSN: 1572-879X
    Keywords: vanadia/alumina ; stability ; NO x selective reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Changes of the V2O5/Al3O3 catalyst aged for up to 10 years under real conditions of the selective catalytic reduction of NO x by ammonia (SCR) at the tail gases of the nitric acid plant were characterized by51V NMR spectroscopy, porosimetry, temperature programmed reduction (TPR) and catalytic activity measurements. The catalytic activity and the redox properties of the catalyst were found intact. Only small variations of the ratio of the octahedral and tetrahedral vanadia species were documented by51V NMR on aged catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00812466
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  • 5
    Electronic Resource
    Electronic Resource
    51V NMR studies of a system vanadium pentoxide-potassium pyrosulfate (1980)
    Springer
    Reaction kinetics and catalysis letters 14 (1980), S. 317-322 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Методом ЯМР на ядрах51V в системе K2S2O7−V2O5 обнаружено два состояния пятивалентного ванадия. Для первого сохраняется полиядерная структура с большим искажением локального окружения по сравнению с V2O5. Для второго состояния ближайшее окружение ванадия существенно иное, чем в V2O5 и характеризуется, видимо, большей ионностью связи ванадий-кислород.
    Notes: Abstract Two states of pentavalent vanadium in the system K2S2O7−V2O5 have been found by the51V NMR method. For state 1 a polynuclear structure with greater distorted local environment compared with V2O5 is retained. For state 2 the nearest environment of vanadium differs significantly from V2O5, and is probably characterized by the higher ionic nature of the vanadium-oxygen bond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02073498
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of type and content of alkaline promoters on the properties of vanadium catalysts for SO2 oxidation (1983)
    Springer
    Reaction kinetics and catalysis letters 22 (1983), S. 59-62 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract В ванадиевых катализаторах окисления SO2 замена 30–60% калиевого промотора на натрий существенно повышает активноцть в области низких температур и степеней превращения SO2. Методом ЭПР показано, что присутствие натрия препятствует характерному для этих условий выделению неактивных соединений четырехвалентного ванадия.
    Notes: Abstract The substitution of 30–50% potassium promoter by sodium in vanadium catalysts for SO2 oxidation is shown to increase significantly their activity at low temperatures and conversions of SO2. ESR studies indicate that the presence of sodium inhibits the evolution of inactive V4+ compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064807
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  • 7
    Electronic Resource
    Electronic Resource
    51V NMR studies of systems V2O5-KHSO4 and V2O5−K2SO4 (1980)
    Springer
    Reaction kinetics and catalysis letters 14 (1980), S. 323-327 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Методом ЯМР на ядрах51V исследованы системы KHSO4−V2O5 и K2SO4−V2O5. В первой системе обнаружены те же сщстояния ванадия, что и в изученной ранее системе K2S2O7−V2O5, при этом обнаружено образование соединения с эквимолекулярным соотношением компонентов. В системе K2SO4−V2O5 состояние ваиадия щтличается от первых двух систем и наблюдается образование соединения с отношением V/K≈4.
    Notes: Abstract Systems V2O5−KHSO4 and V2O5−K2SO4 have been studied by the51V NMR method. The first system demonstrates the same states of vanadium as the previously studied V2O5−K2S2O7, in this system a compound with an equimolar ratio of components has been found. In V2O5−K2SO4 the state of vanadium differs from the above systems and the formation of a compound with V/K=4 is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02073499
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  • 8
    Electronic Resource
    Electronic Resource
    NMR studies of ethylene adsorption on supported zirconium catalysts for polymerization of olefins (1982)
    Springer
    Reaction kinetics and catalysis letters 19 (1982), S. 175-179 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Методом HMP исследована ниэкотемпературная (120–150 K) адсорбц ия этнлена на каталиэаторы, полученные вэаимодействием Zr(BH4)4 и Zr(CH2C6H5)4 c SiO2 и Al2O3. Покаэано, что процессу встраивания этилена по Zr−H и Zr−C свяэям предшествует стадия обратимой адсорбции этилена на ионе циркония.
    Notes: Abstract NMR studies of low-temperature (120–150 K) ethylene adsorption on catalysts prepared via the interaction of Zr(BH4)4 and Zr(CH2C6H5)4 with SiO2 and Al2O3 indicate that the process of ethylene addition on the Zr−H and Zr−C bonds is preceded by a reversible adsorption of ethylene on the zirconium ion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065080
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  • 9
    Electronic Resource
    Electronic Resource
    51V-,29Si- and27Al-NMR studies of the interaction of active component of vanadium catalysts for SO2 oxidation with supports (1984)
    Springer
    Reaction kinetics and catalysis letters 24 (1984), S. 127-131 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Методом ЯМР показано, что силикагели и алюмосиликаты вступают во взаимодействие с активным компоенетом катализатора, прчём в первом случае идёт образование лишь поверхностных соединений.
    Notes: Abstract NMR studies have revealed that silicas and aluminosilicates interact with the active components of vanadium catalysts, in the former case merely yielding surface compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069614
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  • 10
    Electronic Resource
    Electronic Resource
    51V-NMR spectra of vanadates and oxosulfato-vanadates of alkali metals (1984)
    Springer
    Reaction kinetics and catalysis letters 24 (1984), S. 119-125 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract По спектрам ЯМР51V ряда оксидных соединений ванадия установлена связь между типом окружения ванадия и анизотропией химического сдвига, результаты сопоставлены со спектрами реальных катализаторов.
    Notes: Abstract A relation between the type of vanadium environment and the chemical shift anisotropy in the51V-NMR spectra has been established. The results obtained are compared with spectra of real catalysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069613
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