Atomic Cu-N-P-C Active Complex with Integrated Oxidation and Chlorination for Improved Ethylene Oxychlorination

Fine constructing the chemical environment of the central metal is vital in developing efficient single-atom catalysts (SACs). Herein, the atomically dispersed Cu on the N-doped carbon is modulated by introducing Cu-P moiety to Cu-N-C SAC. Through fine-tuning with another heteroatom P, the Cu SAC shows the superior performance of ethylene oxychlorination. The Cu site activity of Cu-NPC is four times higher than the P-free Cu-NC catalyst and 25 times higher than the Ce-promoted CuCl2/Al2O3 catalyst in the long-term test (>200 h). The selectivity of ethylene dichloride can be splendidly kept at approximate to 99%. Combined experimental and simulation studies provide a theoretical framework for the coordination of Cu, N, and P in the complex active center and its role in effectively catalyzing ethylene oxychlorination. It integrates the oxidation and chlorination reactions with superior catalytic performance and unrivaled ability of corrosive-HCl resistance. The concept of fine constructing with another heteroatom is anticipated to provide with inspiration for rational catalyst design and expand the applications of carbon-based SACs in heterogeneous catalysis.

Automated summary

Fine reconstructing the chemical environment of Cu-N-C SAC with Cu-P moiety modulation achieves superior performance in ethylene oxychlorination. The Cu-NPC catalyst exhibits Cu site activity four times higher than P-free Cu-NC catalyst and 25 times higher than Ce-promoted CuCl2/Al2O3 catalyst. The fine construction with another heteroatom provides a theoretical framework for catalyzing ethylene oxychlorination and expands the application of carbon-based SACs in heterogeneous catalysis.