CO Oxidation over Pd/ZrO₂ Catalysts: Role of Support's Donor Sites.
A series of supported Pd/ZrO₂ catalysts with Pd loading from 0.2 to 2 wt % was synthesized. The ZrO₂ material prepared by a similar technique was used as a reference sample. The samples have been characterized by means of transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), testing reaction of ethane hydrogenolysis (HGE), N₂ adsorption, and electron paramagnetic resonance (EPR) spectroscopy. 1,3,5-trinitrobenzene was used as a probe molecule for the EPR spin probe method. The catalytic performance of samples was tested in the model reaction of CO oxidation. It was shown that the concentration of donor sites of support measured by EPR spin probe correlates with catalytic behavior during light-off tests. Low concentration of donor sites on a support's surface was found to be caused by the presence of the specific surface defects that are related to existence of coordinately unsaturated structures.
Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russian. vedyagin@catalysis.ru.|Institute of Natural Resources, National Research Tomsk Polytechnic University, Tomsk 634050, Russian. vedyagin@catalysis.ru.
Aleksey A
AA
Vedyagin
Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russian. volodin@catalysis.ru.
Alexander M
AM
Volodin
Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russian. romankenzhin@gmail.com.
Roman M
RM
Kenzhin
Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russian. chesn@catalysis.ru.
Vladimir V
VV
Chesnokov
Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russian. mishakov@catalysis.ru.|Institute of Power Engineering, National Research Tomsk Polytechnic University, Tomsk 634050, Russian. mishakov@catalysis.ru.
Ilya V
IV
Mishakov
CO oxidation; EPR; Pd catalysts; active sites; heterogeneous catalysis; spin probe; zirconia
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16186911
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17918275
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19779194
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23815772
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24919780
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25222116