TY - JOUR

T1 - Effect of metal-metal and metal-support interaction on activity and stability of Pd-Rh/alumina in CO oxidation

AU - Vedyagin, Aleksey A.

AU - Volodin, Alexander M.

AU - Kenzhin, Roman M.

AU - Stoyanovskii, Vladimir O.

AU - Shubin, Yury V.

AU - Plyusnin, Pavel E.

AU - Mishakov, Ilya V.

PY - 2017/9/15

Y1 - 2017/9/15

N2 - 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 °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 δ-Al2O3. Bimetallic Pd-Rh species with strong metal-metal interaction supported on γ-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.

AB - 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 °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 δ-Al2O3. Bimetallic Pd-Rh species with strong metal-metal interaction supported on γ-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.

KW - Alumina

KW - Bimetallic Pd-Rh catalysts

KW - CO oxidation

KW - Phase transformation

KW - Stability

KW - PALLADIUM

KW - CONVERSION

KW - 3-WAY CATALYSTS

KW - PERFORMANCE

KW - DISPERSION

KW - MODEL

KW - ALUMINA

KW - SURFACE

KW - PD/AL2O3 CATALYSTS

KW - GAMMA-AL2O3

UR - http://www.scopus.com/inward/record.url?scp=85001698826&partnerID=8YFLogxK

U2 - 10.1016/j.cattod.2016.10.010

DO - 10.1016/j.cattod.2016.10.010

M3 - Article

AN - SCOPUS:85001698826

VL - 293-294

SP - 73

EP - 81

JO - Catalysis Today

JF - Catalysis Today

SN - 0920-5861

ER -