Effect of metal ratio in alumina-supported Pd-Rh nanoalloys on its performance in three way catalysis

被引：30
作者：
Vedyagin, Aleksey A. [1 ,2 ]
Stoyanovskii, Vladimir O. [1 ]
Plyusnin, Pavel E. [3 ,4 ]
Shubin, Yury V. [3 ,4 ]
Slavinskaya, Elena M. [1 ]
Mishakov, Ilya V. [1 ,2 ]
机构：
[1] SB RAS, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
[2] Natl Res Tomsk Polytech Univ, Tomsk 634050, Russia
[3] SB RAS, Nikolaev Inst Inorgan Chem, Novosibirsk 630090, Russia
[4] Novosibirsk State Univ, Novosibirsk 630090, Russia
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 749卷
基金：
俄罗斯科学基金会;
关键词：
Three-way catalysts; Metastable Pd-Rh alloy; Partly miscible metals; Metal ratio; Stability; 3-WAY CATALYSTS; BIMETALLIC CATALYSTS; CARBON-MONOXIDE; C3H6; OXIDATION; OXYGEN STORAGE; SOLID-SOLUTION; CO OXIDATION; RHODIUM; STABILITY; PALLADIUM;
D O I：
10.1016/j.jallcom.2018.03.250
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The bimetallic Pd-Rh three-way catalysts were prepared by an incipient wetness impregnation of gamma-Al2O3 with a joint solution of [Pd(NH3)(4)](NO3)(2) and Na-3 [Rh(NO2)(6)]. The ratio of the metals was varied by changing the ratio of the salt-precursors. The samples with Pd:Rh ratio of 3:2, 7:3 and 4:1 were compared in simultaneous oxidation of carbon monoxide, propane, propylene, and reduction of nitrogen monoxide at a lambda factor of 1.003 and 0.95. Stability tests were performed in a prompt thermal aging regime (consecutive heating-cooling cycles with a final temperature of 320, 600 and 800 degrees C). The samples were characterized by UV-vis and luminescence spectroscopies, and by testing reaction of ethane hydrogenolysis. It was found that the sample with Pd: Rh ratio of 3:2 is characterized with strong palladium-rhodium interaction, which makes this catalyst more stable at high temperature if compare with other alloyed Pd-Rh samples. Moreover, the mechanism of the three-way catalytic process over Pd:Rh (3:2) sample differs from other cases and involves a larger contribution of reactions with nitrogen oxide. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：155 / 162
页数：8
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