γ-Al2O3-supported XMo6 Anderson heteropolyoxomolybdates:: Adsorption studies for X = TeVI, AlIII, CoIII, CrIII and NiII by DR spectroscopy and TPR analysis

被引：23

作者：

Cabello, CI ^{[1
]}

Botto, IL

Cabrerizo, F

González, MG

Thomas, HJ

机构：

[1] Natl Univ La Plata, CONICET, CINDECA, RA-1900 La Plata, Argentina

[2] Natl Univ La Plata, CONICET, CEQUINOR, RA-1900 La Plata, Argentina

来源：

ADSORPTION SCIENCE & TECHNOLOGY | 2000年 / 18卷 / 07期

关键词：

D O I：

10.1260/0263617001493657

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The support-overlayer adsorptive interactions, generated when solutions of Anderson heteropolyoxomolybdates were supported as a monolayer on gamma-Al2O3 by means of the equilibrium adsorption method, were studied by XRD analysis, DR spectroscopy, electron microscopy (SEM-EDAX) acid TPR methods. The adsorption isotherms and corresponding adsorption parameters (number of active sites and adsorption constants) of the gamma-Al2O3-supported ammonium heptamolybdate were obtained and discussed. The following sequence of adsorption strength was suggested: CoMo6 > CrMo6 > TeMo6 similar to AlMo6 > NiMo6. The effectiveness of the TPR technique as a tool for elucidating interaction effects was clearly demonstrated. The formation of a gamma-Al2O3-supported Te-Mo mixed valence oxide appears to provide new and interesting catalytic possibilities.

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页码：591 / 608

页数：18

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