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Study of the Structure, Acidic, and Catalytic Properties of Binary Mixed-Oxide MoO 3 −ZrO 2 Systems

Abstract : Binary mixed-oxide materials based on MoO3−ZrO2 (1−68 wt/wt MoO3 nominal content) were prepared by a sol−gel method. The samples were characterized after calcination at 873 K by X-ray diffraction, Raman, UV−vis, and infrared spectroscopy. An increase in the molybdenum content produces an increase in the surface area up to ca. 140 m2 g-1 for a nominal MoO3 content of ca. 20 wt/wt. Simultaneously, the progressive generation of Brönsted acid sites attributed to the presence of surface polymolybdate species takes place. The Zr(MoO4)2 crystalline phase coexists with polymolybdate species for catalysts with a nominal MoO3 content higher than 20 wt/wt. These samples show a lower surface area, but the number of Brönsted acid sites per unit of surface area remains almost constant up to ca. 30 wt/wt MoO3 content. A relationship between the structure of molybdenum surface species, the surface acidity determined by the adsorption of 2,6-dimethylpyridine, and the catalytic behavior of materials in the 2-propanol dehydration are reported.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02399963
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Submitted on : Monday, December 9, 2019 - 12:13:51 PM
Last modification on : Friday, December 13, 2019 - 9:48:23 AM

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Bárbara Samaranch, Pilar Ramírez de la Piscina, Guillaume Clet, Marwan Houalla, Narcís Homs. Study of the Structure, Acidic, and Catalytic Properties of Binary Mixed-Oxide MoO 3 −ZrO 2 Systems. Chemistry of Materials, American Chemical Society, 2006, 18 (6), pp.1581-1586. ⟨10.1021/cm052433c⟩. ⟨hal-02399963⟩

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