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Characterization and study on the thermal aging behavior of palladium–alumina catalysts. / Vedyagin, Aleksey A.; Volodin, Alexander M.; Kenzhin, Roman M. и др.
в: Journal of Thermal Analysis and Calorimetry, Том 130, № 3, 01.12.2017, стр. 1865-1874.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Characterization and study on the thermal aging behavior of palladium–alumina catalysts
AU - Vedyagin, Aleksey A.
AU - Volodin, Alexander M.
AU - Kenzhin, Roman M.
AU - Stoyanovskii, Vladimir O.
AU - Rogov, Vladimir A.
AU - Medvedev, Dmitrii A.
AU - Mishakov, Ilya V.
N1 - Publisher Copyright: © 2017, Akadémiai Kiadó, Budapest, Hungary.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - A series of Pd/Al2O3 catalysts were prepared by incipient wetness impregnation method. Palladium loading was varied in a range of 0.125–4.0 mass%. The catalytic performance of the samples was tested in model reaction of CO oxidation at oxygen excess. Catalysts were characterized by temperature-programmed reduction (TPR), electron paramagnetic resonance, and UV–visible spectroscopy. Thermal aging of chosen samples was performed at 1000 °C. The thermal aging behavior was studied using TPR, X-ray diffraction analysis, transmission electron microscopy, and X-ray photoelectron spectroscopy (XPS). It was shown that palladium stabilized in the form of dispersed surface Pd2+ species when Pd loading is 0.5 mass% and below. Samples with higher loading preferentially contain nanosized Pd particles. Agglomeration of Pd species during thermal aging was found to take place starting from Pd concentration of 1.0 mass%. In some cases, size of Pd particles exceeds 150 nm, which is in about 40 times higher comparing with the initial samples. According to XPS data, degree of Pd2+-alumina interaction in the aged samples is also increased.
AB - A series of Pd/Al2O3 catalysts were prepared by incipient wetness impregnation method. Palladium loading was varied in a range of 0.125–4.0 mass%. The catalytic performance of the samples was tested in model reaction of CO oxidation at oxygen excess. Catalysts were characterized by temperature-programmed reduction (TPR), electron paramagnetic resonance, and UV–visible spectroscopy. Thermal aging of chosen samples was performed at 1000 °C. The thermal aging behavior was studied using TPR, X-ray diffraction analysis, transmission electron microscopy, and X-ray photoelectron spectroscopy (XPS). It was shown that palladium stabilized in the form of dispersed surface Pd2+ species when Pd loading is 0.5 mass% and below. Samples with higher loading preferentially contain nanosized Pd particles. Agglomeration of Pd species during thermal aging was found to take place starting from Pd concentration of 1.0 mass%. In some cases, size of Pd particles exceeds 150 nm, which is in about 40 times higher comparing with the initial samples. According to XPS data, degree of Pd2+-alumina interaction in the aged samples is also increased.
KW - Alumina
KW - CO oxidation
KW - Palladium
KW - Thermal aging
KW - TPR
KW - PD/AL2O3
KW - COMBUSTION
KW - HYDROGENATION
KW - STABILITY
KW - PD/GAMMA-ALUMINA
KW - CO OXIDATION
KW - OXYGEN
KW - SUPPORT
KW - TEMPERATURE
KW - CARBON-MONOXIDE
UR - http://www.scopus.com/inward/record.url?scp=85021066181&partnerID=8YFLogxK
U2 - 10.1007/s10973-017-6530-y
DO - 10.1007/s10973-017-6530-y
M3 - Article
AN - SCOPUS:85021066181
VL - 130
SP - 1865
EP - 1874
JO - Journal of Thermal Analysis and Calorimetry
JF - Journal of Thermal Analysis and Calorimetry
SN - 1388-6150
IS - 3
ER -
ID: 9443721