• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Chemistry and Physics >Synthesis, characterization and material evaluation of mesoporous silicas templated by a polyglycols triblock copolymer for catalytic applications
【24h】

Synthesis, characterization and material evaluation of mesoporous silicas templated by a polyglycols triblock copolymer for catalytic applications

机译：Synthesis, characterization and material evaluation of mesoporous silicas templated by a polyglycols triblock copolymer for catalytic applications

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

Mesoporous silicas (MS-1 to MS-9) were synthesized using a polyglycols triblock copolymer (TCP) as the surfactant. The effects of acidity, tetraethyl orthosilicate (TEOS) and TCP contents, gelling temperature and stabilities of the materials were investigated. Increasing acidity favored mesopores formation. A material with a total surface area of 760 m2 g-1, mostly in mesoporous size range was obtained at a gel composition of 1.0(TEOS):0.017(TCP):7.3HCl:115.7H2O. The controlling mechanisms for mesopores formation were mainly influenced by the TEOS:TCP ratio. Increasing the ratio from 1.56:1 to 2.09:1 promoted the mesoporosity while further increase to 2.61:1 was detrimental. An increase in TCP content to 3.5 (w/w) improved micellization. Silanols caused weak acidity of mesoporous silica, especially in highly mesoporous silicas. Thermal and hydrothermal treatments reduced mesoporosity by 19.2 and 32.6, respectively, with the formation of secondary nanopores. At 75 MPa, MS-3 retained more than 80 of its surface area.

著录项

获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号