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首页> 外文期刊>RSC Advances >Thermally stable sandwich-type catalysts of Pt nanoparticles encapsulated in CeO2 nanorod/CeO2 nanoparticle core/shell supports for methane oxidation at high temperatures
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Thermally stable sandwich-type catalysts of Pt nanoparticles encapsulated in CeO2 nanorod/CeO2 nanoparticle core/shell supports for methane oxidation at high temperatures

机译：Pt纳米粒子的热稳定夹层型催化剂在CeO2纳米棒/ CeO2纳米颗粒核心/壳载体上封装在高温下甲烷氧化

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摘要

The thermal stability of nanocatalysts is of great importance to develop high performing catalysts in terms of high activity and robust catalytic stability, especially for high-temperature catalysis. Herein, we report a sandwich-type Pt nanocatalyst encapsulated in ceria-based core/shell supports (CNR@Pt@CNP), which consists of CeO _(2) nanorods as core, CeO _(2) nanoparticles as shell and Pt nanoparticles (PtNPs) embedded between the CeO _(2) nanorods and CeO _(2) nanoparticles. The catalysts exhibited remarkable thermal stability at high temperature by effectively preventing PtNPs from thermal sintering. Methane combustion was carried out on the CNR@Pt@CNP catalysts at 400–700 °C to evaluate their catalytic activity and stability. By comparing to the same amount of PtNPs supported on CeO _(2) nanorods (CNR@Pt), CNR@Pt@CNP delivered higher catalytic activity at high temperatures (>500 °C). The methane conversion catalyzed by CNR@Pt@CNP slightly decreased from 82.3% to 80.0% after 12 hours at 650 °C. The improved performance of CNR@Pt@CNP originated from the CeO _(2) nanoparticles as stabilizer, which can prevent the thermal sintering of PtNPs, strengthen the thermal stability of the catalyst and enhance the metal-support interaction.
机译：纳米催化剂的热稳定性在高活性和稳健的催化稳定性方面，高度表现催化剂，特别是对于高温催化而言非常重要。在此，我们报告了包裹在基于Ceria的核心/壳体支持（CNR @ Pt @ CNP）中的夹层型Pt纳米催化剂，其由CEO _（2）纳米码作为核心，CEO_（2）纳米粒子作为壳和Pt纳米颗粒组成（PTNPS）嵌入CEO _（2）纳米棒和CEO _（2）纳米粒子之间。通过有效地防止热烧结，催化剂在高温下表现出显着的热稳定性。在400-700℃的CNR @ Pt + CNP催化剂上进行甲烷燃烧，评价它们的催化活性和稳定性。通过比较CEO _（2）纳米棒（CNR @ Pt）上支持的相同量的PTNP，CNR @ Pt @ CNP在高温（> 500℃）下递送更高的催化活性。 CNR催化在650℃下12小时后，CNR催化的甲烷转化率略微降低82.3％至80.0％。 CNR @ Pt @ CNP的性能来自CEO _（2）纳米粒子作为稳定剂，可以防止PTNP的热烧结，增强催化剂的热稳定性，增强金属载体相互作用。

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