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论文类型：期刊论文

发表时间：2021-01-09

发表刊物：NEW JOURNAL OF CHEMISTRY

卷号：43

期号：40

页面范围：16096-16102

ISSN号：1144-0546

摘要：Developing advanced nanocatalysts with superior structural and textural characteristics can provide significant potential for CO oxidation. Herein, triple-shelled CuO/CeO2 hollow nanospherical catalysts have been successfully prepared through a metal-organic framework (MOF) engaged strategy, involving two steps: thermal annealing of CeMOF precursors and subsequent deposition-precipitation of CuO. By tuning the loading of CuO species, the composites show a typical volcano-shaped relationship between the composition and the catalytic activity. CuO/CeO2-8% is the most active catalyst with the lowest temperature (130 degrees C) to achieve complete CO conversion, and it possesses the maximum turnover frequency (TOF) value of 1.72 x 10(-3) s(-1) at 90 degrees C. Systematic structural characterization revealed that the remarkably improved catalytic performance can be attributed to a unique porous triple-shelled structure, abundant surface oxygen vacancies, greater Cu+ content, more lattice oxygen and the synergistic effect between two individual components. Furthermore, the superior catalyst also has good cyclic stability. Of significance, this work may open a novel, facile avenue for fabricating desirable multicomponent nanocatalysts from proper MOFs for pollution control and environment protection.