醇钛制备介孔二氧化钛和硬脂酸钛配合物的结构研究

Ryōji Takahashi, Shoichi Takenaka, S. Sato, T. Sodesawa, K. Ogura, K. Nakanishi
{"title":"醇钛制备介孔二氧化钛和硬脂酸钛配合物的结构研究","authors":"Ryōji Takahashi, Shoichi Takenaka, S. Sato, T. Sodesawa, K. Ogura, K. Nakanishi","doi":"10.1039/A804984J","DOIUrl":null,"url":null,"abstract":"A mesoporous titania was prepared from titanium tetraisopropoxide and stearic acid (STA). The pore size of the titania increases linearly from ca. 5 to 15 nm with increase in the STA/Ti ratio (X) for X 1.5. A mol equivalent of STA coordinates with Ti atom forming a bidentate carboxy group and excess STA forms propyl stearate. Upon calcination, the propyl stearate is removed at a lower temperature by vaporization, and does not affect the pore structure of the titania. The Ti–STA precursor has the layered structure of the Ti–STA complex, whose interplanar distance increases with increasing STA content, while the mesoporous titania is composed of aggregates of crystallites of anatase. During calcination of the precursor, decomposition of the complex and crystallization of anatase occur concurrently. The crystallization process is considered to be affected by the interplanar distance of the layered structure in the precursor, so that both the pore size and the pore volume increase with increase in the STA/Ti ratio.","PeriodicalId":17286,"journal":{"name":"Journal of the Chemical Society, Faraday Transactions","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"41","resultStr":"{\"title\":\"Structural study of mesoporous titania and titanium–stearic acid complex prepared from titanium alkoxide\",\"authors\":\"Ryōji Takahashi, Shoichi Takenaka, S. Sato, T. Sodesawa, K. Ogura, K. Nakanishi\",\"doi\":\"10.1039/A804984J\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A mesoporous titania was prepared from titanium tetraisopropoxide and stearic acid (STA). The pore size of the titania increases linearly from ca. 5 to 15 nm with increase in the STA/Ti ratio (X) for X 1.5. A mol equivalent of STA coordinates with Ti atom forming a bidentate carboxy group and excess STA forms propyl stearate. Upon calcination, the propyl stearate is removed at a lower temperature by vaporization, and does not affect the pore structure of the titania. The Ti–STA precursor has the layered structure of the Ti–STA complex, whose interplanar distance increases with increasing STA content, while the mesoporous titania is composed of aggregates of crystallites of anatase. During calcination of the precursor, decomposition of the complex and crystallization of anatase occur concurrently. The crystallization process is considered to be affected by the interplanar distance of the layered structure in the precursor, so that both the pore size and the pore volume increase with increase in the STA/Ti ratio.\",\"PeriodicalId\":17286,\"journal\":{\"name\":\"Journal of the Chemical Society, Faraday Transactions\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1998-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"41\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of the Chemical Society, Faraday Transactions\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1039/A804984J\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Chemical Society, Faraday Transactions","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1039/A804984J","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 41

摘要

以四异丙醇钛和硬脂酸为原料制备了介孔二氧化钛。随着STA/Ti比(X)在X 1.5时的增加,二氧化钛的孔径从约5 nm线性增加到15 nm。一摩尔当量的STA与Ti原子配位形成双齿羧基,过量的STA形成硬脂酸丙酯。在煅烧后,硬脂酸丙酯在较低的温度下通过汽化去除,并且不影响二氧化钛的孔隙结构。Ti-STA前驱体具有Ti-STA配合物的层状结构,其面间距随着STA含量的增加而增加,而介孔二氧化钛则由锐钛矿结晶的聚集体组成。在前驱体煅烧过程中,配合物的分解和锐钛矿的结晶同时发生。晶化过程受前驱体层状结构的面间距离的影响,孔径和孔容随STA/Ti比的增大而增大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structural study of mesoporous titania and titanium–stearic acid complex prepared from titanium alkoxide
A mesoporous titania was prepared from titanium tetraisopropoxide and stearic acid (STA). The pore size of the titania increases linearly from ca. 5 to 15 nm with increase in the STA/Ti ratio (X) for X 1.5. A mol equivalent of STA coordinates with Ti atom forming a bidentate carboxy group and excess STA forms propyl stearate. Upon calcination, the propyl stearate is removed at a lower temperature by vaporization, and does not affect the pore structure of the titania. The Ti–STA precursor has the layered structure of the Ti–STA complex, whose interplanar distance increases with increasing STA content, while the mesoporous titania is composed of aggregates of crystallites of anatase. During calcination of the precursor, decomposition of the complex and crystallization of anatase occur concurrently. The crystallization process is considered to be affected by the interplanar distance of the layered structure in the precursor, so that both the pore size and the pore volume increase with increase in the STA/Ti ratio.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信