Steam effects over Pd/Ce0.67Zr0.33O2 three-way catalyst

被引：6
|
作者：
Wang Jianqiang [1 ,2 ]
Shen Meiqing [1 ,3 ]
Wang Jun [1 ]
Wang Wulin [2 ]
机构：
[1] Tianjin Univ, Sch Chem Engn & Technol, State Educ Minist, Key Lab Green Chem Technol, Tianjin 300072, Peoples R China
[2] China Automot Technol & Res Ctr, Tianjin 300162, Peoples R China
[3] Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China
来源：
JOURNAL OF RARE EARTHS | 2011年 / 29卷 / 03期
关键词：
three-way catalysts; water-gas shift; steam reforming; turnover frequency; compensation effect; rare earths; WATER-GAS-SHIFT; OXYGEN STORAGE CAPACITY; MIXED OXIDES; HETEROGENEOUS CATALYSIS; PD/AL2O3; CATALYST; CARBON-MONOXIDE; SURFACE-AREA; OXIDATION; CERIA; PROPANE;
D O I：
10.1016/S1002-0721(10)60434-6
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
In the purification process of automobile exhaust, existing water plays an important role as an oxidant, which converts CO and hydrocarbons (HCs) by the water-gas shift (WGS) and the steam reforming (SR) reactions, respectively, especially at high temperatures. Meanwhile it is major component of the exhaust which can affect significantly the thermal stability of the three-way catalyst. Activity experiments were carried out close to the real operation conditions (GHSV, concentration, etc.) with a Pd/Ce0.67Zr0.33O2 catalyst supplying information on the CO and C3H8 oxidation reactions in feedstream formed by different reactant combinations. The obtained results showed that the activity of the CO and C3H8 oxidation was promoted by the addition of steam due to the WGS and SR reactions. The WGS and SR reaction were competitive under oxygen-lean conditions. The kinetic analysis was considered for WGS and SR reactions.
引用
收藏
页码：217 / 224
页数：8
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