Effect of metal-metal and metal-support interaction on activity and stability of Pd-Rh/alumina in CO oxidation

被引：54
作者：
Vedyagin, Aleksey A. [1 ,2 ,3 ]
Volodin, Alexander M. [1 ]
Kenzhin, Roman M. [1 ,3 ]
Stoyanovskii, Vladimir O. [1 ,3 ]
Shubin, Yury V. [3 ,4 ]
Plyusnin, Pavel E. [3 ,4 ]
Mishakov, Ilya V. [1 ,2 ,4 ]
机构：
[1] Boreskov Inst Catalysis SB RAS, Novosibirsk 630090, Russia
[2] Natl Res Tomsk Polytech Univ, Tomsk 634050, Russia
[3] Nikolaev Inst Inorgan Chem SB RAS, Novosibirsk 630090, Russia
[4] Novosibirsk State Univ, Novosibirsk 630090, Russia
来源：
CATALYSIS TODAY | 2017年 / 293卷
基金：
俄罗斯科学基金会;
关键词：
CO oxidation; Bimetallic Pd-Rh catalysts; Alumina; Stability; Phase transformation; 3-WAY CATALYSTS; PD/AL2O3; CATALYSTS; PALLADIUM; ALUMINA; MODEL; GAMMA-AL2O3; PERFORMANCE; DISPERSION; CONVERSION; SURFACE;
D O I：
10.1016/j.cattod.2016.10.010
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
A series of Pd-Rh/alumina catalysts with total precious metals loading of 0.2 wt.% was prepared by means of mechanical mixing of monometallic precursors and incipient wetness impregnation of the support with dual complex salt. Gamma and delta alumina supports were obtained from commercial aluminum hydroxide by calcinations at 720 and 1000 degrees C respectively. Supports were examined by electron paramagnetic resonance spectroscopy, low-temperature nitrogen adsorption, X-ray diffraction analysis and photoluminescence spectroscopy. It was shown that concentration of donor sites of the supports differs according to distinctions between values of their specific surface areas. Finally, the strength of metal-support interaction is getting much weaker in the case of delta-Al2O3. Bimetallic Pd-Rh species with strong metal-metal interaction supported on,gamma-Al2O3 were found to be characterized by superior high-temperature stability. Pd/Rh ratios of 3:2 and 7:3 were shown to be the most appropriate for this purpose. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：73 / 81
页数：9
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