Cr and Co-modified Cu/Al₂O₃ as an efficient catalyst for the continuous synthesis of bis(2-dimethylaminoethyl)ether

A series of transition metal-doped Cu-based Al 2 O 3 catalysts were prepared by a coprecipitation–kneading method, in which Cu–Cr–Co/Al 2 O 3 shows desirable catalytic toward continuous amination of diethylene glycol with dimethylamine to bis(2-dimethylaminoethyl)ether.