Deactivation of the catalyst for two-stage hydrogenation of 3-hydroxypropionaldehyde to 1, 3-propanediol

By using a fixed-bed reactor, the stability of the bimetal supported catalyst Ni-D/HM for two-stage hydrogenation of 3-hydroxypropionaldehyde to 1, 3-propanediol was studied. The deactivation of the second-stage hydrogenation catalyst was studied by activity evaluation, XRD, BET, TG-DTA, atomic absorption spectroscopy and element analysis. It was found that for the second-stage hydrogenation of 3-hydroxypropionaldehyde to 1, 3-propanediol, the surface area, pore volume and framework of the deactivated catalyst changed apparently compared to the fresh catalyst, and coke formed on and Ni was spilt from the surface of the deactivated catalyst, which were the main reasons of the deactivation of the catalyst. Long time stability test showed that the Ni-D/HM catalyst could keep relatively high activity and excellent stability with decreasing the reaction temperature and space velocity.