Preparation of Non-Precious Metal Core–Shell Catalysts and its Catalysis in Hydrogenation of 3-Hydroxypyridine

Achieving cost-effective hydrogenation of 3-hydroxypyridine to 3-hydroxypiperidine is still a challenge issue. Herein, a non-noble metal core–shell structured catalyst Ni 8.0 -Co 2.0 @SiO 2 -5.0–0.10 has been prepared for the hydrogenation of 3-hydroxypyridine with a yield of 95.0%. In this study, a membrane dispersion reactor was used to prepare the core of the catalyst, followed by a hydrolysis process to construct the SiO 2 shell. This semi-continuous method enables the efficient production of core–shell catalysts, not only overcoming the low efficiency of traditional preparation methods but also enhancing catalytic performance. Characterization results indicate that the metal cores synthesized using the membrane dispersion reactor exhibit smaller particle sizes, while the SiO 2 shell effectively prevents agglomeration of the core nanoparticles. This ensures that the catalyst simultaneously achieves a minimum particle size of 9.17 nm and a maximum specific surface area of 110.31 m 2 /g. Graphical By using membrane dispersion reactor, a large number of non-noble metal nanoparticles can be prepared quickly, and then coated with a SiO2 shell exhibits remarkable hydrogenation activity, resulting in a 97.5% selectivity and 95% yield of 3-hydroxypiperidine.