Abstract
Oxalate was selected as a precursor to generate nonstoichiometric ZnO through a controlled pyrolysis protocol. The decomposition and combustion of the oxalate under air not only produced a large number of oxygen vacancies but also resulted in mesostructured ZnO. After deposition of Pd nanoparticles through in situ reduction, the resulting composites showed defect-dependent catalytic activity for low temperature CO oxidation. Under a space velocity of 15 000 ml·h−1·gcat−1, 1.0 vol% CO could be totally converted at 0 °C for 5.0 wt% Pd loaded catalyst under ambient condition. Even for the lower noble-metal loading catalyst (1.0 wt% Pd/ZnO), T50 was 36 °C, much lower than that containing less defect.
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