The hydrogenation of 3-hydroxypropanal (HPA) to 1,3-propanediol
(PD) over
Ni/SiO2/Al2O3
catalyst powder was carried out at 318−353 K and 2.60−5.15 MPa in a
batchwise-operated
stirred autoclave. A kinetic model which can well describe the
reactions of this process was
developed. The model parameters were estimated by the maximum
likelihood function of the
concentration of HPA and PD according to concentration−time profiles
measured at different
temperatures and pressures. To obtain high selectivity of PD the
reaction temperature should
be lower than 333 K.
Strong intraparticle diffusion resistance was observed and the apparent effectiveness factors were measured for the hydrogenation of 3-hydroxypropanal (HPA) to 1,3-propanediol (PO) over Ni/SiO,/Al,O, catalyst pellets at 45 to 80°C and 2.60 to 5.15 MPa in a stitred reactor with a spinning basket. A mathematical model was proposed to describe the intraparticle diffusion and to estimate the effective diffusion coeficients of HPA, PD and hydrogen under reaction conditions by a maximum likelihood function of the apparent effectiveness factors of HPA and PD. The calculated concentration distributions of HPA, PD and hydrogen in catalyst particles reveal an excess of hydrogen at 80°C and higher temperatures, but an excess of HPA at 45°C. It results in a weak dependence of the consumption formation rate of HPA and PD on the partial pressure of hydrogen at high temperature.
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