In-situ formation of NixB/MIL-101(Cr) and Pd/MIL-101(Cr) composites for catalytic hydrogenation of quinoline

In situ reduction of NiCl2 incorporated in porous coordination polymer MIL-101(Cr) by NaBH4 or reduction of PdCl2 incorporated in MIL-101(Cr) by H2 led to formation of NixB/MIL-101(Cr) and Pd/MIL-101(Cr) composites, respectively. Hydrogenation of quinoline at presence of these composites led to formation of 1,2,3,4-tetrahydroquinoline in more than 90% yield, but in the case of Ni-containing catalyst 8 times higher metal loading in the reaction mixture was required to achieve this result (in the same conditions). The composites after the reaction were characterized by TEM and powder XRD.