Enhanced catalytic combustion of chlorobenzene over CuO-CeO2: The effect of highly dispersed CuO on the lattice oxygen microenvironment

Abstract

Efficient chlorobenzene elimination poses a significant challenge for catalytic oxidation methods. In this work, a series of heterogeneous interface enhanced CuO-CeO₂ catalysts were designed for accurate regulation of lattice oxygen chemical microenvironment. The physicochemical properties of demonstrated that the highly electronegative Cu within the Cu-O-Ce framework significantly boosted lattice oxygen activity, and the chemical environment of the Cu-O-Ce lattice oxygen can be precisely regulated the by the grafting effect of CuO. Therefore, the Cu-Ce-MOF-0.3 demonstrated superior activity in chlorobenzene oxidation, achieving a T₉₀ of 262 °C. Following 70 h of rigorous evaluation, no discernible decline in activity was detected, thereby highlighting the catalyst's exceptional chlorine resistance and robust overall stability. The in situ DRIFTS spectra suggests that the ring-opening of phenolate species and the decomposition of chloroacetate are key factors constraining the enhancement of catalytic activity. This surface oxygen environment regulation strategy offers a novel avenue for the development of highly effective chlorobenzene catalytic oxidation catalysts.