Angewandte Chemie International Edition · 2018 · 175 citations · 41 references
An efficient strategy (enhanced metal oxide interaction and core-shell confinement to inhibit the sintering of noble metal) is presented confined ultrathin Pd-CeO<sub>x</sub> nanowire (2.4 nm) catalysts for methane combustion, which enable CH<sub>4</sub> total oxidation at a low temperature of 350 °C, much lower than that of a commercial Pd/Al<sub>2</sub> O<sub>3</sub> catalyst (425 °C). Importantly, unexpected stability was observed even under harsh conditions (800 °C, water vapor, and SO<sub>2</sub> ), owing to the confinement and shielding effect of the porous silica shell together with the promotion of CeO<sub>2</sub> . Pd-CeO<sub>x</sub> solid solution nanowires (Pd-Ce NW) as cores and porous silica as shells (Pd-CeNW@SiO<sub>2</sub> ) were rationally prepared by a facile and direct self-assembly strategy for the first time. This strategy is expected to inspire more active and stable catalysts for use under severe conditions (vehicle emissions control, reforming, and water-gas shift reaction).
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