...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catalysis science & technology >Determination of acid structures on the surface of sulfated monoclinic and tetragonal zirconia through experimental and theoretical approaches
【24h】

Determination of acid structures on the surface of sulfated monoclinic and tetragonal zirconia through experimental and theoretical approaches

机译：通过实验和理论方法测定硫酸化单斜藻和四方锆表面上的酸结构

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

摘要

Sulfated zirconia (SZ) plays an important role in solid acid catalysts. To understand the origin of the super acidity over the surface of sulfated zirconia, pure monoclinic and tetragonal phase zirconia and their sulfated counterparts (M-SZ and T-SZ, respectively) were prepared, and the acid properties of these samples were characterized by P-31 MAS NMR using TMP as the probe molecule. In comparison with zirconia, stronger Lewis acid (LA) and Bronsted acid (BA) sites were generated over the SZ samples after sulfation. The density ratios of the newly generated LA and strong BA sites were found to be ca. 2.0 : 1.0 on M-SZ and ca. 1.8 : 1.0 on T-SZ. Based on this quantitative relationship between the newly generated LA and strong BA sites, the possible acid structures on the SZ surface with different crystal phases are established. After structural optimization and theoretical calculation, the super acid sites originating from the bisulfate ions on the monoclinic (001) plane and the tetragonal (111) plane are determined.
机译：硫酸化锆（SZ）在固体酸催化剂中起重要作用。为了了解超酸性在硫酸化氧化锆表面上的起源，纯单斜形和四方相氧化菌及其硫酸化对应物（分别为M-SZ和T-SZ），并制备了这些样品的酸性特性，由P进行了特征。 -31 MAS NMR使用TMP作为探针分子。与锆石相比，在硫酸盐后，在SZ样品上产生了较强的路易斯酸（LA）和Bronsted Acid（BA）位点。新生成的LA的密度比发现强大的BA位点是CA的。 2.0：1.0在M-SZ和CA。 1.8：1.0在T-SZ上。基于新生成的LA和强BA位点之间的这种定量关系，建立了具有不同晶体相的SZ表面上的酸结构。在结构优化和理论计算之后，确定了源自单斜（001）平面上的硫酸盐离子和四方（111）平面的超快位点。

著录项

相似文献

  • 外文文献
  • 中文文献
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