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The deactivation of Ni/SiO 2 /Al 2 O 3 -catalyst pellets in hydrogenation of 3-hydroxypropanal (HPA) to 1,3-propanediol (PD) was investigated in a continuously operated spinning basket reactor at temperatures 45-80°C and pressures 2.60-5.15 MPa. The adsorption of by-products and probably also impurities from the liquid feed causes a deactivation of the catalyst by blockage...
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