Controlling NO<sub><i>x</i></sub> Reduction Pathways of Rh Catalysts with Oxygen-Vacancy-Rich ZnO<sub>1-<i>x</i></sub> Nanoparticles Derived from a Metal-Organic Framework.
basic_science · Level V
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- Record sourced from PubMed, PMID 41416399.
- Also identified by DOI 10.1021/acs.nanolett.5c05675.
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Abstract
Surface and lattice vacancies in crystal structures play a critical role in improving properties, but synthesizing vacancy-rich crystals remains a significant challenge. In this research, we proposed a novel method to synthesize ZnO<sub>1-<i>x</i></sub> nanoparticles (NPs) with rich oxygen vacancies (V<sub>O</sub>), by thermally decomposing a H<sub>2</sub>DAB-Zn<sub>2</sub>(ox)<sub>3</sub> metal-organic framework. The high-concentration V<sub>O</sub> in ZnO<sub>1-<i>x</i></sub> NPs were confirmed by X-ray powder diffraction, X-ray photoelectron spectroscopy, electron paramagnetic resonance, and other measurements. The lattice expansion was observed for ZnO<sub>1-<i>x</i></sub> NPs, resulting from electrostatic repulsion between Zn<sup>2+</sup> and positive V<sub>O</sub>. As the support for NO<sub><i>x</i></sub> reduction, the homogeneously dispersed PGM/ZnO<sub>1-<i>x</i></sub> (PGM = Ru, Rh, Pd, Ir, and Pt) catalysts were prepared and exhibited remarkable improvement in activities compared with the corresponding PGM/ZnO. The activity enhancement of Rh/ZnO<sub>1-<i>x</i></sub> may be attributed to strong CO adsorption and fast NO dissociation induced by the abundant V<sub>O</sub>, resulting in a short reaction pathway distinct from Rh/ZnO.