HYDROGENATION CATALYSTS BASED ON PLATINUM- AND PALLADIUM-CONTAINING
39
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order kinetics with respect to the substrate and the first
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the kinetic regime, the Tile criterion (Φ) was used.
Φ = R√w/cD
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with R, the average diameter of catalyst particles, cm;
w; the reaction rate, mol L–1 s–1; c, concentration of sub-
strate, mol/L; D, the diffusion coefficient, 10–5 cm2 s–1.
The diffusion coefficient was evaluated at substrate
conversion below 10% and at constant reaction rate. In
the performed experiments, the Tile criterion was
significantly lower than unity, Φ = (0.1–1.3)×10–5.
Therefore, the reactions definitely proceeded in the
kinetic regime.
To estimate the catalysts stability, subsequent substrate
portions were added after complete conversion of the
previous portion of substrate without separation of ca-
talyst and isolation of products from the reaction mixture.
Hydrogenation products were analyzed with
standard 3700 chromatograph equipped with flame
ionization detector, with 2000×3 mm glass column
filled with lucopren G-1000 (5%) on Chromaton-AW-
DMCS; at argon carrier gas flow rate of 0.90±0.02 L/h,
evaporator temperature of 230°C, column temperature
of 200°C, and injected specimen volume of 0.5–1 μL.
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ACKNOWLEDGMENTS
Authors are grateful to N.N. Vershinin,
V.A. Bakaev, and O.N. Efimov (Institute of Problems
of Chemical Physics, Russian Academy of Sciences,
Chernogolovka) for providing the samples of Pt/ND
and Pd/ND and to Yu.V. Shchegol’kov (Central
Scientific and Research Institute of Geological Survey
of Nonferrous and Noble metals, Moscow) for
performing the XPS analysis of catalysts.
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tion, Ivanovo, 2005.
The work was financially supported by Russian
Foundation for Basic Research (project no. 12-03-
97546-r_tsentr_a.)
19. Usanova, N.N., Candidate Sci. (Chem.) Dissertation,
Ivanovo, 2008.
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