Preparation of Intelligent Water Vapor Control Material by Selective Leaching Method

选择性浸出法制备智能水汽控制材料

• 批准号: 09450240
• 负责人: OKADA Kiyoshi
• 金额: $ 7.94万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450240/
• 关键词: Vapor control property; Selective leaching; Alumina; Gas adsorption; Silica

Preparation of high functional porous materials was investigated by heat treatment and chemical treatment of kaolinite to utilize the wasted kaolinite used abundantly in paper as coating and filler materials. The kaolinite was heat treated to convert into metakaolinite and composite in gamma-alumina and amorphous silica, respectively. They were chemically treated by KOH and H_2SO_4 solutions at various temperatures and times. As a result, porous gamma-alumina was obtained by selective leaching of amorphous silica using KOH solution while porous silica was obtained by selective leaching of alumina using H_2SO_4 solution. The porous properties of the gamma-alumina was as follows ; specific surface area about 300 m^2/g, total pore volume about 0.7 ml/g and pore size about 5-6 nm. The pore size distribution was very sharp. The porous properties of the silica was as follows ; specific surface area about 400 m^2/g, total pore volume about 0.3 ml/g and pore size about 0.6 nm. Since the water vapor adsorption of the gamma-alumina showed steep increase from about 70% of relative humidity and the maximum adsorption was about 600 ml/g, it is considered as a candidate of intelligent vapor control material. On the other hand, since that of the silica showed steep increase from very low relative humidity and the maximum amount of adsorption was 1/3 of that of the gamma-alumina, this porous silica is not suitable as a vapor control material. The important factors to further improve intelligence of vapor control function were discussed on the basis of physical factors of porous properties and also chemical properties by surface modification.

利用造纸中大量使用的废弃高岭石作为涂料和填充材料，通过对高岭石进行热处理和化学处理，研究制备高功能多孔材料。对高岭石进行热处理，分别转化为偏高岭石和γ-氧化铝和无定形二氧化硅的复合物。它们在不同温度和时间下用KOH和H_2SO_4溶液进行化学处理。结果，用KOH溶液选择性浸出无定形二氧化硅得到多孔γ-氧化铝，而用H_2SO_4溶液选择性浸出氧化铝得到多孔二氧化硅。 γ-氧化铝的多孔性质如下；比表面积约300 m^2/g，总孔容约0.7 ml/g，孔径约5-6 nm。孔径分布非常尖锐。二氧化硅的多孔性质如下：比表面积约400 m^2/g，总孔容约0.3 ml/g，孔径约0.6 nm。由于γ-氧化铝的水蒸气吸附量从相对湿度约70%开始急剧增加，最大吸附量约为600ml/g，因此被认为是智能蒸气控制材料的候选者。另一方面，由于二氧化硅的吸附量从非常低的相对湿度开始急剧增加，并且最大吸附量为γ-氧化铝的1/3，因此该多孔二氧化硅不适合作为蒸气控制材料。在多孔性能的物理因素和表面改性的化学性能的基础上，讨论了进一步提高蒸汽控制功能智能化的重要因素。

项目成果

K.Okada,Y.Saito,M.Hiroki,T.Tomita and S.Tomura: "Water Sorption on Mesoporouo 8-Alumina Prepared by the Selective Leaching Method" J.Porous Mater.4[4]. 253-260 (1997)

K.Okada，Y.Saito，M.Hiroki，T.Tomita 和 S.Tomura：“选择性浸出法制备的 Mesoporouo 8-氧化铝上的水吸附”J.Porous Mater.4[4]。

K.Okada,A.Shimai,Y.Kameshima and A.Yasumori: "Characterization of Microporous Silica Prepared by Selective teaching of Calcined Kaclinite" Clay Sci.10[4]. 337-348 (1998)

K.Okada、A.Shimai、Y.Kameshima 和 A.Yasumori：“通过选择性教学煅烧钾长石制备的微孔二氧化硅的表征”Clay Sci.10[4]。

K.Okada, Y.Saito, M.Hiroki, I.Tomita and S.Tomura: "Water Sorption on Mesoporouo γ-Alumina Prepared by the Selective Leaching Method" J.Porous Mater.4[4]. 253-60 (1997)

K.Okada、Y.Saito、M.Hiroki、I.Tomita 和 S.Tomura：“选择性浸出法制备的 Mesoporouo γ-氧化铝上的水吸附”J.Porous Mater.4[4]（1997 年）。 ）

前田雅喜, 王新江, 渡村信治, 大橋文彦, 鈴木正哉, 岡田清: "選択溶解法で調製したメソポア多孔質材料による焼成体の作製とその水蒸気吸着特性" J.Ceram.Soc.Jpn. 106[4]. 428-431 (1998)

Masayoshi Maeda、Xinkin Wang、Shinji Watarimura、Fumihiko Ohashi、Masaya Suzuki、Kiyoshi Okada：“利用选择性溶解法制备的中孔多孔材料制备烧成体及其水蒸气吸附性能”J.Ceram.Soc.Jpn.106。 ]。428-431（1998）。

K.Okada,A.Shimai,S.Hayashi and A.Yasumori: "Preparation of Microporous,Silica from Metakaolinite by Selective Leachins Method" Microporous Mesoporous Mater.21[4-6]. 289-296 (1998)

K.Okada，A.Shimai，S.Hayashi和A.Yasumori：“选择性浸出法从偏高岭石中制备微孔二氧化硅”微孔介孔材料.21[4-6]。