Articulo
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
Registro en:
issn:0263-6174
issn:2048-4038
Autor
Cabello, Carmen Inés
Botto, Irma Lía
Cabrerizo, Franco Martín
González, María Gloria
Thomas, Horacio Jorge
Institución
Resumen
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. Facultad de Ciencias Exactas Centro de Investigación y Desarrollo en Ciencias Aplicadas Centro de Química Inorgánica