Separated Active Site and Reaction Space for Multi‐Pollutant Elimination Significantly Enhancing Low Toxic Product Selectivity

Abstract It is possible to remove volatile organic compounds containing chlorine (CVOCs, such as chlorobenzene) in a single device designed for selective catalytic reduction of NO_x with NH₃ for the industries containing CVOCs and NO_x. Breaking the efficiency‐selectivity trade‐off in chlorobenzene oxidation remains a major challenge due to the conjugation of halogen atoms with the benzene ring and the reducing nature of NH₃. A stepwise synthesis strategy is demontrated to disperse dual Ru/Cu Lewis acid sites outside and inside the zeolite channel. Under the confinement of zeolite, the Ru⁴⁺ Lewis acid site on the external surface of the zeolite promotes chlorobenzene oxidation by weakening the p‐π conjugate structure of Cl and benzene ring, while the Cu²⁺ Lewis acid site within the internal channel converts NO_x and NH₃ to N₂. The mutual interference between catalytic oxidation and reduction is successfully avoided. Therefore, the low toxic CO₂ and HCl selectivity experience a considerable increase from 21% to 86%, and from 51% to 94% with 91% conversion of chlorobenzene, while maintaining excellent elimination performance for NO (with N₂ selectivity exceeding 90%). The incorporation of separated active sites and reaction spaces into the design may offer potentials for other energy and environmental applications.