The role of chemisorbed water in formation and stabilization of active sites on Pd/Alumina oxidation catalysts

被引：35
|
作者：
Vedyagin, Aleksey A. [1 ,2 ]
Volodin, Alexander M. [1 ]
Kenzhin, Roman M. [1 ]
Stoyanovskii, Vladimir O. [1 ]
Rogov, Vladimir A. [1 ,3 ]
Kriventsov, Vladimir V. [1 ]
Mishakov, Ilya V. [1 ,2 ]
机构：
[1] Boreskov Inst Catalysis, Novosibirsk 630090, Russia
[2] Natl Res Tomsk Polytech Univ, Tomsk 634050, Russia
[3] Novosibirsk State Univ, Novosibirsk 630090, Russia
来源：
CATALYSIS TODAY | 2018年 / 307卷
关键词：
CO oxidation; Palladium catalysts; Alumina; Stability; Chemisorbed water; PALLADIUM-ALUMINA CATALYSTS; CARBON-MONOXIDE OXIDATION; VENTILATION AIR METHANE; PD/AL2O3; CATALYSTS; GAMMA-ALUMINA; SUPPORTED PALLADIUM; 3-WAY CATALYSTS; HYDROXYL-GROUPS; ELECTRON-DONOR; CO OXIDATION;
D O I：
10.1016/j.cattod.2017.01.033
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
A series of Pd/Al2O3 catalysts with different palladium loading was prepared by incipient wetness impregnation method. As it was shown by various physicochemical methods, palladium at concentrations not exceeding 0.5 wt.% favors to stabilize in an atomic dispersed ionic state. Appearance of PdO phase has been firmly detected by TPR, DR UV-vis and EXAFS starting from Pd concentration of 1 wt.%. It was found that low-content Pd/Al2O3 catalysts are characterized by high activity in CO oxidation due to atomically dispersed palladium species tailored to the donor sites of the support. The presence of chemisorbed water allows one to stabilize Pd in highly disperse state thus preventing the catalyst deactivation. (c) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：102 / 110
页数：9
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