Thermal stability and SO2 resistance of Pd/Rh-perovskite based three-way catalyst wash-coated on cordierite monoliths

被引：2

作者：

Bayram, Bilal ^{[1
]}

Onal, Isik ^{[1
]}

Kulah, Gorkem ^{[1
]}

机构：

[1] Middle East Tech Univ, Dept Chem Engn, Ankara, Turkey

来源：

CHEMICAL ENGINEERING COMMUNICATIONS | 2023年 / 210卷 / 02期

关键词：

Rh-Pd-Perovskite; SO2; poisoning; three-way catalysts; thermal stability; SELF-REGENERATION; OXIDATION CATALYST; PHASE-COMPOSITION; CARBON-MONOXIDE; CO OXIDATION; PD; TEMPERATURE; EXHAUST; OXIDE; DEACTIVATION;

D O I：

10.1080/00986445.2022.2030727

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The effect of hydrothermal aging and SO2 poisoning on the three-way catalytic performance of dispersed Pd/Rh-based and Pd/Rh perovskite-based catalysts were studied by using a dynamic activity test system that simulates redox fluctuations of gasoline engine exhaust conditions. Both catalysts were supported on ceria-zirconia-alumina and wash-coated on cordierite monoliths and were characterized by ICP-OES, BET, XRD, TEM-EDX, DRIFTS, and CO chemisorption. Their performance was very close when the catalysts were fresh but, after 3 h of hydrothermal aging at 1000 degrees C, the dispersed Pd/Rh-based catalyst lost its performance especially with respect to C3H8 and NO conversions; however, the Pd/Rh perovskite-based catalyst kept its activity. Parallel to that, CO uptake capacity losses after hydrothermal aging were 85% and 30% for the dispersed metallic catalyst and the perovskite-based catalyst, respectively. Moreover, 20 ppm SO2 exposure decreased CO uptake capacities by 61% and 48% for the two catalysts, respectively.

引用

页码：205 / 222

页数：18

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