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A study on Adsorption of Molecules by Ftnir and Calorimetry

傅里叶变换和量热法对分子吸附的研究

基本信息

批准号：
02640346
负责人：
ISHIKAWA Tatsuo
金额：
$ 1.22万
依托单位：
Osaka Kyoiku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

1)Surface structure of and adsorption of molecules on hydroxylapatitesIt was found that the P-OH groups exist on the strontium and calcium hydroxylapatites and function as the adsorption sites for various molecules such as H_2O, CO_2 and organic molecules. A Liart of adsorbed H_2O, CO_2 and CH_3OH were chemisorbed. The mechanism of chemisorption was clarified by FTIR.2)Preparation and characterization of noble iron oxidesThe iron oxides prepared in the presence of various chelating agents showed the characteristic adsorption properties such as selective adsorption of H_2O.3)Preparation and adsorptive property of microporous hematiteThe hematite(alpha-Fe_2O_3) Produced by outgassing delta-FeOOH above 200ﾟC was found to have-slit-like micropores of 0.8 nm width. The states of the surface FE-OH groups of this hematite and of the adsorbed molecules in the micropores were investigated by FTIR. The adsorption of molecules in the slit-like micropore depended on their dipole moments, molecular sizes and chemical reactivities.4)Step-like adsorption isotherm and surface heterogeneityStep-like isotherms were discovered on the adsorption of H_2O, CCl_4, C_6H_6 and n-C_6H_<14>. This result was explained based on the, chemically and geometrically heterogeneity of gamma-FeOOH surface.5)Preparation and characterization of monodispersed spherical metal phosphate particlesThe mondispersed particles of cobalt and nickel phosphates were characterized by various techniques. The layer structures of these particles led to the selective adsorption of H_2O. The particles treated above 100ﾟC possessed a hollow structure.

1)羟基磷灰石表面结构及分子吸附研究发现锶、钙羟基磷灰石上存在P-OH基团,可作为H_2O、CO_2及有机分子等多种分子的吸附位点。大量吸附的H_2O、CO_2和CH_3OH被化学吸附。通过FTIR阐明了化学吸附机理。2)贵重氧化铁的制备及表征在多种螯合剂存在下制备的氧化铁表现出选择性吸附H_2O等特征吸附性能。3)微孔赤铁矿的制备及吸附性能脱气产生的赤铁矿(α-Fe_2O_3) δ-FeOOH在200℃以上被发现具有宽度为0.8 nm的狭缝状微孔。通过 FTIR 研究了该赤铁矿表面 FE-OH 基团和微孔中吸附分子的状态。狭缝微孔中分子的吸附取决于其偶极矩、分子尺寸和化学反应活性。4)阶梯式吸附等温线和表面异质性对H_2O、CCl_4、C_6H_6和n-C_6H_<14>的吸附发现了阶梯式等温线。这一结果是基于γ-FeOOH表面的化学和几何异质性来解释的。5)单分散球形金属磷酸盐颗粒的制备和表征通过各种技术对单分散的磷酸钴和磷酸镍颗粒进行了表征。这些颗粒的层状结构导致了H_2O的选择性吸附。在100℃以上处理的颗粒具有空心结构。