γ-Al₂O₃-Supported XMo₆ Anderson Heteropolyoxomolybdates: Adsorption Studies for X = Te<sup>VI</sup>, Al<sup>III</sup>, Co<sup>III</sup>, Cr<sup>III</sup> and Ni<sup>II</sup> by DR Spectroscopy and TPR Analysis

The support-overlayer adsorptive interactions, generated when solutions of Anderson heteropolyoxomolybdates were supported as a monolayer on γ-Al₂O₃ by means of the equilibrium adsorption method, were studied by XRD analysis, DR spectroscopy, electron microscopy (SEM-EDAX) and TPR methods. The adsor...

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Detalles Bibliográficos
Autores principales: Cabello, Carmen Inés, Botto, Irma Lía, Cabrerizo, Franco Martín, González, María Gloria, Thomas, Horacio Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 2000
Materias:
Ciencias Exactas
Química
Heteropolyoxomolybdates
adsorption
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123748
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:The support-overlayer adsorptive interactions, generated when solutions of Anderson heteropolyoxomolybdates were supported as a monolayer on γ-Al₂O₃ by means of the equilibrium adsorption method, were studied by XRD analysis, DR spectroscopy, electron microscopy (SEM-EDAX) and TPR methods. The adsorption isotherms and corresponding adsorption parameters (number of active sites and adsorption constants) of the γ-Al₂O₃-supported ammonium heptamolybdate were obtained and discussed. The following sequence of adsorption strength was suggested: CoMo₆ > CrMo₆ > TeMo₆ ~ AlMo₆ > NiMo₆. The effectiveness of the TPR technique as a tool for elucidating interaction effects was clearly demonstrated. The formation of a γ-Al₂O₃-supported Te-Mo mixed valence oxide appears to provide new and interesting catalytic possibilities.

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