Nickel-modified triphenylamine-based conjugated porous polymers as precatalyst for ethylene oligomerization

Two-dimensional (2D)/three-dimensional (3D) conjugated porous polymers (CPPs) with a moderate surface area and tunable pore size are promising porous materials for catalysis. The imine-based 2D conjugated porous polymers (CPPs) was synthesized through the coupling of tris(4-aminophenyl)amine and p-phthalaldehyde and used as carrier to support nickel(II) to synthesize nickel-modified conjugated porous polymers (Ni@TAPA-CPPs) for ethylene oligomerization. The Ni@TAPA-CPPs catalyst with excellent thermal stability and pore size distri-butions revealed an efficient catalytic activity of 15.18 x 104 g/(mol Nish) and the selectivity of C6 olefin for ethylene oligomerization in cyclohexane at room temperature. Moreover, the Ni@TAPA-CPPs catalyst was prepared simply and easy to recycle, and still had excellent catalytic activity after 3 consecutive cycles. This study exposes the two-dimensional (2D) conjugated porous polymers (CPPs) for the application of ethylene oligomerization and provides theoretical support for the application of CPPs in the field of ethylene oligomerization.