Kinetics of Acetaldehyde Hydrogenation over Silver*

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  • Kinetics of Acetaldehyde Hydrogenation

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The kinetics of acetaldehyde hydrogenation over silver has been studied by using the steady state and transient response method, at temperatures ranging from 130 to 180℃ under atmospheric pressure. The rate expression is γ EtOH=kP_<H_2>P^<0.44>_<CH_3CHO> The analysis of the transient and steady state behavior of the reaction proposes a suitable Eley-Rideal mechanism. The diffuse reflectance infrared fourier transform spectroscopic analysis of the adsorbed species clearly shows acetaldehyde to be weakly adsorbed on the surface during the reaction, and its surface coverage is 0.4-0.7 depending on the concentration of acetaldehyde. The transient response method elucidates the formation of acetic acid and ethyl acetate when the surface oxygen originated from gas flow as an impurity is formed or resides.

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