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  • 1985-1989  (3)
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  • 1
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Импульсным микрокаталитическим методом в установках проточного типа с неподвижным и вибровзвешенным слоем катализатора изучен механизм окисления н-бутана на α-VOPO4. Установлено равенство скоростей катализа и восстановления, свидетельствующее об окислтельно-восстаовительном механизме преврщения бутана и образования малеинового ангидрида. Показано, что в процессе катализа продкты реакции образуются, в основном, зт счет кислорда катализатора и происходит восстановление α-VOPO4 в (VO)2P2O7.
    Notes: Abstract Mechanism of n-butane oxidation of α-VOPO4 has been studied in pulse fixed and vibrofluidized catalyst bed reactors by the pulse microcatalytic method. It has been established that the rates of catalysis and reduction are similar, which indicates a reduction-oxidation mechanism for butane conversion and maleic anhydride formation. In the course of catalysis the reaction products are formed largely at the expense of catalyst oxygen and α-VOPO4 reduces to (VO)2P2O7.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Heterogen-Catalytical Oxidation and Ammoxidation of Isobutene. 5. Gas-Phase Oxidation of Methacrolein to Methacrylic Acid on Definite 1:1 Vanadium PhosphatesFor the Oxidation of Methacrolein (MA) to Methacrylic Acid (MAA) definite 1:1 vanadium phosphates were used as test catalysts. (VIVO)2P2O7 (1) is directing the reaction with high selectivity to MAA. On using the VV monophosphates α-(2) and β-VOPO4 (3), a valence-mixed “H-V/P mica” (with α-based structure; 46.5% VIV portion) (4), and also the new phosphate VIVO(HPO4) (5), however, only a modest selectivity is observed. Whereas the diphosphate 1 was found to be unchanged after the catalytical reaction, in the case of the monophosphates solid state reactions occured during the catalysis: 2 was reduced to a H-V/P mica (6) with 29% VIV portion, 4 to the hemi-hydrate VIV O(HPO4) · 0.5 H2O (7); and from 3, as new compounds, 5 (see above) and a VIII/VIV phosphate (8) were formed. On preparing 5 as a pure phase and using it for the catalysis it mostly remained unchanged; only a minor part was reduced to 8. - The catalytical action of 1 is discussed.
    Notes: Bei der Oxydation von Methacrolein (MA) zu Methacrylsäure (MAA) wurden als Versuchskatalysatoren definierte 1:1-Vanadiumphosphate eingesetzt. (VIVO)2P2O7 (1) lenkt die Reaktion mit hoher Selektivität zu MAA. Beim Einsatz der VV-Monophosphate α-(2) und β-VOPO4 (3) sowie eines valenzgemischten „H-V/P-Glimmers“ (mit α-Grundstruktur; 46,5% VIV-Anteil) (4) und des neuen Phosphates VIVO(HPO4) (5) sind dagegen nur geringe Selektivitäten festzustellen. Während das Diphosphat 1 nach der Katalysereaktion unverändert vorlag, traten bei den Monophosphaten während der Katalyse Festkörperreaktionen ein: 2 wurde zu einem H-V/P-Glimmer (6) mit 29% VIV-Anteil und 4 zu dem Halbhydrat VIVO(HPO4) · 0,5 H2O (7) reduziert, und aus 3 resultierten als neue Verbindungen 5 (s. o.) sowie ein noch näher zu charakterisierendes VIII/VIV-Phosphat (8). Präparativ phasenrein dargestelltes und zur Katalyse eingesetztes 5 blieb im wesentlichen unverändert; nur eine geringe Menge wurde zu 8 reduziert. - Die katalytische Wirkung von 1 wird diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 1987-01-01
    Print ISSN: 0920-5861
    Electronic ISSN: 1873-4308
    Topics: Chemistry and Pharmacology , Physics
    Published by Elsevier
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