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The effects of Ru on the V2O5–WO3/TiO2 catalyst were studied in NOx and chlorobenzene (CB) simultaneous controls in terms of promoting the C–Cl cleavage and decreasing polychlorinated species. Herein, we synthesized Ru-modified vanadia-based catalysts, which demonstrated stable NOx and CB conversions with high selectivity to N2, CO2, and HCl. The newly formed V–O–Ru chains on the surface strengthened the electron capability and narrowed down the band gap of vanadium, which weakened the Lewis acid sites to avoid the generation of polychlorinated species via electrophilic reactions. The formation of oxygen vacancies on Ru–O–Ti was considerably enhanced compared with that on V = O, V–O–V, and V–O–Ti, leading to the acceleration in the ring opening of benzoates, whereas the selective catalytic reduction (SCR) performance below 325 °C remained the same. Ru modification lowered the energy barriers of the C–Cl cleavage and elevated the energy barriers of CB dehydrogenation and chlorination, which are critical steps in CB oxidation and byproduct formation, respectively.
Song et al. (Wed,) studied this question.