MOLYBDENUM-OXO SPECIES DEPOSITED ON ALUMINA BY ADSORPTION .1. MECHANISM OF THE ADSORPTION

被引：98

作者：

SPANOS, N ^{[1
]}

VORDONIS, L ^{[1
]}

KORDULIS, C ^{[1
]}

LYCOURGHIOTIS, A ^{[1
]}

机构：

[1] UNIV PATRAS,CHEM ENGN & CHEM PROC HIGH TEMP RES INST,DEPT CHEM,POB 1239,UNIV CAMPUS,GR-26110 PATRAS,GREECE

来源：

JOURNAL OF CATALYSIS | 1990年 / 124卷 / 02期

关键词：

D O I：

10.1016/0021-9517(90)90179-N

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The mechanism of adsorption of molybdates on the surface of γ-alumina was investigated by use of adsorption equilibrium experiments, potentiometric titrations, microelectrophoresis and UV/VIS spectroscopy. From the experimental results and the theoretical analysis of the isotherms it was concluded that MoVI deposition was done by adsorption of the MoxOyz- ions on energetically equivalent and distinct sites of the inner Helmholtz plane (IHP) of the double layer on the surface of the γ-alumina particles suspended in the aqueous medium. The creation of these sites was mainly attributed to the presence of the protonated surface hydroxyls of γ-alumina and not to the neutral hydroxyls. Analysis of the adsorption isotherms suggested that considerable lateral interactions are exerted between the adsorbed MoxOyz- ions, resulting in the formation of MoxOyz- ... MoxOyz- ... oligomers in the IHP. It is proposed that these polymeric ions are deposited on the surface in the drying step. © 1990.

引用

页码：301 / 314

页数：14

共 28 条

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