INVESTIGATION OF CHROMATOGRAPHIC PROPERTIES OF TITANIA. II. INFLUENCE OF CALCINATION TEMPERATURE
作者:
K. Tani,
E. Miyamoto,
期刊:
Journal of Liquid Chromatography & Related Technologies
(Taylor Available online 1999)
卷期:
Volume 22,
issue 6
页码: 857-871
ISSN:1082-6076
年代: 1999
DOI:10.1081/JLC-100101703
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The characterization of calcined titanias with regard to physical properties as packing materials and crystal forms by X-ray powder diffraction, and the examination of how the ion- and ligand-exchange properties of titania shall be influenced by varying calcination temperature, were demonstrated to elucidate the relationship between the chromatographic behavior and the change of surface state accompanied with varying calcination temperature. The ligand-exchange properties in this experiment were regarded as the formation of chelate rings of 2-hydroxyl aliphatic carboxylic acids. We observed that the physical properties of titania reflected, exactly, the variation in X-ray diffraction patterns with calcination temperature. We found that only calcined titania behaving as cation-exchanger exhibited retention behavior correlated with changes in surface hydroxyl group, and that rutile formed by calcination did not behave as ion- and ligand-exchangers. The absence of these properties would account for losing the surface hydroxyl group and the coordinatively bonded water by calcination.
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