Unveiling the origin of enhanced catalytic performance of CePO4/Pt for selective hydrogenation of nitroarenes

Supported catalysts are widely used in selective hydrogenation of nitroarenes, in which the choice of support has an important effect on the catalytic reaction rate and the selectivity of products. Herein, CePO 4 as support to stabilize Pt nanoparticles for selective hydrogenation of nitroarenes is presented. The catalyst achieves a remarkable selectivity of aromatic amine production (>95 %) with a high turnover frequency (1476 h −1 ). Mechanistic studies reveals that the electronic structure of Pt is modulated by CePO 4 . In comparison to conventional CeO 2 /Pt catalyst, the Pt sites on CePO 4 are negatively charged. Such configuration allows facile dissociation of H 2 on Pt sites. Meanwhile, the potential-determining step (the formation of Ph-HNOH from Ph-HNO) on CePO 4 /Pt (0.73 eV) is a significantly lower than CeO 2 /Pt (1.15 eV), thereby favoring the pathway for aromatic amine production on Pt sites. Moreover, the CePO 4 support has strong adsorption capacity of substrate, which plays a role as new active sites when adsorbed substrates are activated by active hydrogen species via hydrogen spillover. This work provides a new perspective into the development of selective nitroarenes conversion through the artful design of supported catalysts.