Thermally‐Stable Single‐Site Pd on CeO <sub>2</sub> Catalyst for Selective Amination of Phenols to Aromatic Amines without External Hydrogen
Yaqin Wang, Bingfeng Chen, Lina Li, Xuelei Mei, Yu‐Cheng Gu, Haihong Wu, Mingyuan He, Buxing Han
Abstract
Abstract Developing a new route to produce aromatic amines as key chemicals from renewable phenols is a benign alternative to current fossil‐based routes like nitroaromatic hydrogenation, but is challenging because of the high dissociation energy of the Ar−OH bond and difficulty in controlling side reactions. Herein, an aerosolizing‐pyrolysis strategy was developed to prepare high‐density single‐site cationic Pd species immobilized on CeO 2 (Pd 1 /CeO 2 ) with excellent sintering resistance. The obtained Pd 1 /CeO 2 catalysts achieved remarkable selectivity of important aromatic amines (yield up to 76.2 %) in the phenols amination with amines without external hydrogen sources, while Pd nano‐catalysts mainly afforded phenyl‐ring‐saturation products. The excellent catalytic properties of the Pd 1 /CeO 2 are closely related to high‐loading Pd single‐site catalysts with abundant surface defect sites and suitable acid‐base properties. This report provides a sustainable route for producing aromatic amines from renewable feedstocks.