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Effect of Alumina Phase Transformation on Stability of Low-Loaded Pd-Rh Catalysts for CO Oxidation. / Vedyagin, Aleksey A.; Volodin, Alexander M.; Stoyanovskii, Vladimir O. et al.

In: Topics in Catalysis, Vol. 60, No. 1-2, 02.2017, p. 152-161.

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Vedyagin AA, Volodin AM, Stoyanovskii VO, Kenzhin RM, Plyusnin PE, Shubin YV et al. Effect of Alumina Phase Transformation on Stability of Low-Loaded Pd-Rh Catalysts for CO Oxidation. Topics in Catalysis. 2017 Feb;60(1-2):152-161. doi: 10.1007/s11244-016-0726-4

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Vedyagin, Aleksey A. ; Volodin, Alexander M. ; Stoyanovskii, Vladimir O. et al. / Effect of Alumina Phase Transformation on Stability of Low-Loaded Pd-Rh Catalysts for CO Oxidation. In: Topics in Catalysis. 2017 ; Vol. 60, No. 1-2. pp. 152-161.

BibTeX

@article{7689422781cd455aa6598cb17c4f1b0a,
title = "Effect of Alumina Phase Transformation on Stability of Low-Loaded Pd-Rh Catalysts for CO Oxidation",
abstract = "Bimetallic Pd-Rh catalysts with precious metal loading of 0.2 wt% was prepared by incipient wetness impregnation of the support (γ-Al2O3or δ-Al2O3) with dual complex salt [Pd(NH3)4]3[Rh(NO2)6]2. Monometallic Pd and Rh catalysts as well as its mechanical mixture were used as the reference samples. All samples were exposed for in situ prompt thermal aging procedure, and characterized by EPR spectroscopy, UV–Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The nature of the support was found to have strong effect on high temperature stability of the samples. δ-Al2O3having non-uniform phase structure due to presence of θ-Al2O3and α-Al2O3traces causes the concentrating of rhodium near the interphase boundary, thus changing the mechanism of Rh3+bulk diffusion if compare with γ-Al2O3. No noticeable anchoring effects were observed for bimetallic Pd-Rh samples neither in terms of Rh bulk diffusion nor with regard to the Pd sintering. It has been found experimentally that phase transformation of γ-Al2O3at high temperatures does not play dramatic role for the deactivation of bimetallic Pd-Rh active species anchored to the electron-donor site of the support.",
keywords = "Alumina, Bimetallic Pd-Rh catalysts, CO oxidation, Deactivation, Phase transformation, Stability, Thermal aging, PD/AL2O3, PALLADIUM, CE, PR, PERFORMANCE, BEHAVIOR, SITES, OXYGEN STORAGE CAPACITY",
author = "Vedyagin, {Aleksey A.} and Volodin, {Alexander M.} and Stoyanovskii, {Vladimir O.} and Kenzhin, {Roman M.} and Plyusnin, {Pavel E.} and Shubin, {Yury V.} and Mishakov, {Ilya V.}",
year = "2017",
month = feb,
doi = "10.1007/s11244-016-0726-4",
language = "English",
volume = "60",
pages = "152--161",
journal = "Topics in Catalysis",
issn = "1022-5528",
publisher = "Springer Netherlands",
number = "1-2",

}

RIS

TY - JOUR

T1 - Effect of Alumina Phase Transformation on Stability of Low-Loaded Pd-Rh Catalysts for CO Oxidation

AU - Vedyagin, Aleksey A.

AU - Volodin, Alexander M.

AU - Stoyanovskii, Vladimir O.

AU - Kenzhin, Roman M.

AU - Plyusnin, Pavel E.

AU - Shubin, Yury V.

AU - Mishakov, Ilya V.

PY - 2017/2

Y1 - 2017/2

N2 - Bimetallic Pd-Rh catalysts with precious metal loading of 0.2 wt% was prepared by incipient wetness impregnation of the support (γ-Al2O3or δ-Al2O3) with dual complex salt [Pd(NH3)4]3[Rh(NO2)6]2. Monometallic Pd and Rh catalysts as well as its mechanical mixture were used as the reference samples. All samples were exposed for in situ prompt thermal aging procedure, and characterized by EPR spectroscopy, UV–Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The nature of the support was found to have strong effect on high temperature stability of the samples. δ-Al2O3having non-uniform phase structure due to presence of θ-Al2O3and α-Al2O3traces causes the concentrating of rhodium near the interphase boundary, thus changing the mechanism of Rh3+bulk diffusion if compare with γ-Al2O3. No noticeable anchoring effects were observed for bimetallic Pd-Rh samples neither in terms of Rh bulk diffusion nor with regard to the Pd sintering. It has been found experimentally that phase transformation of γ-Al2O3at high temperatures does not play dramatic role for the deactivation of bimetallic Pd-Rh active species anchored to the electron-donor site of the support.

AB - Bimetallic Pd-Rh catalysts with precious metal loading of 0.2 wt% was prepared by incipient wetness impregnation of the support (γ-Al2O3or δ-Al2O3) with dual complex salt [Pd(NH3)4]3[Rh(NO2)6]2. Monometallic Pd and Rh catalysts as well as its mechanical mixture were used as the reference samples. All samples were exposed for in situ prompt thermal aging procedure, and characterized by EPR spectroscopy, UV–Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The nature of the support was found to have strong effect on high temperature stability of the samples. δ-Al2O3having non-uniform phase structure due to presence of θ-Al2O3and α-Al2O3traces causes the concentrating of rhodium near the interphase boundary, thus changing the mechanism of Rh3+bulk diffusion if compare with γ-Al2O3. No noticeable anchoring effects were observed for bimetallic Pd-Rh samples neither in terms of Rh bulk diffusion nor with regard to the Pd sintering. It has been found experimentally that phase transformation of γ-Al2O3at high temperatures does not play dramatic role for the deactivation of bimetallic Pd-Rh active species anchored to the electron-donor site of the support.

KW - Alumina

KW - Bimetallic Pd-Rh catalysts

KW - CO oxidation

KW - Deactivation

KW - Phase transformation

KW - Stability

KW - Thermal aging

KW - PD/AL2O3

KW - PALLADIUM

KW - CE

KW - PR

KW - PERFORMANCE

KW - BEHAVIOR

KW - SITES

KW - OXYGEN STORAGE CAPACITY

UR - http://www.scopus.com/inward/record.url?scp=85013908893&partnerID=8YFLogxK

U2 - 10.1007/s11244-016-0726-4

DO - 10.1007/s11244-016-0726-4

M3 - Article

AN - SCOPUS:85013908893

VL - 60

SP - 152

EP - 161

JO - Topics in Catalysis

JF - Topics in Catalysis

SN - 1022-5528

IS - 1-2

ER -

ID: 10278952