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Structure and reactivity of vanadium-phosphorus oxides

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Abstract

The contribution of thermal methods of analysis to the study of the structure and reactivity of vanadium-phosphorus oxides is examined. In particular, data are reported on the solid-state reaction VOHPO4·1/2H2O→(VO)2P2O7+2 H2O for VOHPO4·1/2H2O prepared in different ways, on the redox properties of oxidation and reduction of vanadium for catalysts prepared with different P∶V atomic ratios in the range 0.9–1.3, and on the surface properties determined by TPD of catalysts with different P∶V ratios. The relationship between these properties and the catalytic properties in the selective oxidation ofn-butane and but-1-ene is discussed.

Zusammenfassung

Der Beitrag thermischer Analysenmethoden zur Untersuchung der Struktur und Reaktivität von Vanadin-Phosphor-Oxiden wird erörtert. Insbesondere werden sich auf die Festkörperreaktion 2VOHPO4.1/2H2O→(VO)2P2O7+2H2O für auf verschiedene Weise dargestelltes VOHPO4.1/2H2O, auf die Redox-Eigenschaften von Vanadin in Katalysatoren mit P/V-Atomverhältnissen im Bereich 0.9–1.3 und auf durch TPD bestimmte Oberflächeneigenschaften von Katalysatoren mit unterschiedlichen P/V-Verhältnissen beziehende Angaben gemacht. Zusammenhänge zwischen diesen Eigenschaften und den katalytischen Eigenschaften bei der selektiven Oxydation von n-Butan und N-Buten werden diskutiert.

Резюме

Исследован вклад тер мических методов ана лиза в изучение структуры и реакционной способности системы окислов ванадий-фосф ор. Приведены, в зависимо сти от метода получен ия VOHPO4 · 1/2H2O, данные для тверд отельной реакции VOHPO4 · 1/2H2O→(VO)2P2O7 + 2H2O, оказывающей влияние на окислительно-восста новительные и поверх ностные свойства свойства ванадиевых катализа торов с атомным соотн ошением P∶V в области 0,9∶1,3. Обсуждена зависимость между эт ими свойствами катал изаторов и их каталитической ак тивностью при селективном окислен ии н-бутана и 1-бутена.

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Authors and Affiliations

  1. Istituto di Technologie Chimiche Speciali, Universitá di Bologna, Italy

    F. Cavani, G. Centi, F. Trifirò & G. Poli

  2. Instituto di Metallurgia, Università di Bologna, Italy

    G. Poli

Authors
  1. F. Cavani
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  2. G. Centi
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  3. F. Trifirò
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  4. G. Poli
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Cavani, F., Centi, G., Trifirò, F. et al. Structure and reactivity of vanadium-phosphorus oxides. Journal of Thermal Analysis 30, 1241–1251 (1985). https://doi.org/10.1007/BF01914292

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