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A kinetic study of vinyl acetate (VA) synthesis over a Pd(100) catalyst is described, and the effect of particle-size on this reaction ascertained by comparing the single crystal data with data from supported Pd catalysts (5 wt% Pd/SiO2, dPd = 4.2 nm, and 1 wt% Pd/SiO2, dPd = 2.5 nm). A negative reaction order with respect to ethylene and a positive order with respect to oxygen were found for the...
The formation of Pd carbide (PdCx) during the synthesis of vinyl acetate (VA) was investigated over Pd/SiO2 catalysts with two different Pd particle sizes, as well as over a Pd–Au/SiO2 mixed-metal catalyst. XRD data show that PdCx was produced in the pure Pd catalysts after reaction based on the downshift of the Pd(111) and (200) XRD features. The smaller Pd particles showed greater resistance...
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