O-17 Solid-State NMR Study on the Size Dependence of Oxygen Activation over Silver Catalysts
O-17 Solid-State NMR Study on the Size Dependence of Oxygen Activation over Silver Catalysts
复制标题
O-17 固态核磁共振研究银催化剂氧活化的尺寸依赖性
DOI：
10.1021/jp308637z
复制
发表时间：
2012-12
影响因子：
3.7
通讯作者：
Bao, Xinhe
中科院分区：
文献类型：
--
作者：
Wang, Xuefeng;Han, Xiuwen;Huang, Yining;Sun, Junming;Xu, Suochang;Bao, Xinhe
The capabilities of silver catalysts with different particle sizes for oxygen activation were systematically studied by O-17 solid-state NMR. The observation of O-17 signal at around 0 ppm for silver catalysts indicates that silver activates O-17(2) molecules and that subsequent formation of active O-17 species leads to the oxygen exchange with the mesoporous SiO2 supports. The initial appearances of the O-17 signals at different temperatures for three silver catalysts show that oxygen activation strongly depends on the size of Ag particle. Their ability of activating oxygen molecules is in the order Ag-3/MCM-41 > Ag-5/SBA-15 > Ag-10/SBA-15. Ag-3/MCM-41 is able to activate oxygen molecules and facilitates the oxygen exchange with the support even at room temperature. Although the NMR signal of active O-17 species on silver catalysts is not observed directly, the approach described in this work can be used to indirectly determine the conditions on which the active oxygen species can be produced during catalytic oxidation reactions. The silver catalysts can also be used for O-17 enrichment of the oxide-based materials under mild conditions.
登录
查看更多内容
影响因子：
15
作者：
Sun, Junming;Ma, Ding;Su, Dangsheng
通讯作者：
Su, Dangsheng
影响因子：
2.9
作者：
Seravalli, Javier;Ragsdale, Stephen W.
通讯作者：
Ragsdale, Stephen W.
影响因子：
7.3
作者：
J. Nováková;L. Brabec
通讯作者：
J. Nováková;L. Brabec
影响因子：
8.6
作者：
Namjun Kim;J. Stebbins
通讯作者：
Namjun Kim;J. Stebbins
DOI：
10.1016/s0167-2991(97)80590-3
发表时间：
1997
期刊：
Studies in Surface Science and Catalysis
影响因子：
--
作者：
L. Bull;A. Cheetham
通讯作者：
L. Bull;A. Cheetham