Monolithic PdNi-NCNFs@FN Bimetallic Catalyst for Catalytic Hydrogenation of High-Concentration and High-Molecular-Weight PS

Monolithic catalyst has eliminated or weakened the adverse effects on the polymer hydrogenation activity of traditional heterogeneous catalysts. This work delves into the adsorption and activation processes of the benzene ring on the surface of catalyst-active metals. Ni has been introduced into Pd to prepare the PdNi-NCNFs@FN bimetallic catalyst. The active metals Pd and Ni have formed bimetallic nanoparticles, and nickel doping can effectively regulate the adsorption energy of PS benzene ring, promote the desorption of intermediates and catalyst surface renewal, and thus improve the activity of PdNi-NCNFs@FN in hydrogenation (with a TOF of 54.78 gPS/(gPd·h)). The catalyst prepared under optimized conditions showed excellent performance in high-concentration/molecular-weight PS hydrogenation. The catalyst significantly weakens the hindrance of viscosity and conformation effects through the shear thinning of high-speed agitation and the “dragon entangled column” mechanism. PdNi-NCNFs@FN has great potential for industrial applications in expanding the PS hydrogenation industry, increasing PS hydrogenation yield, and preparing high-molecular-weight PCHE.