Bifunctional core-shell architecture allows stable H2 production utilizing CH4 and CO2 in a catalytic chemical looping process
Bifunctional core-shell architecture allows stable H2 production utilizing CH4 and CO2 in a catalytic chemical looping process
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DOI：
10.1016/j.apcatb.2019.117946
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发表时间：
2019-12
影响因子：
22.1
通讯作者：
Davood Hosseini;P. M. Abdala;Felix Donat;Sung Min Kim;C. Müller
中科院分区：
文献类型：
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作者：
Davood Hosseini;P. M. Abdala;Felix Donat;Sung Min Kim;C. Müller
我们报告的双功能催化剂（Pt）-氧载体（Fe 2 O3）的发展，集成了甲烷干重整（DRM）的化学循环为基础的生产氢气。该材料表现出高且稳定的甲烷转化率（约80%）和氢气产率（10.8mmol/g催化剂-氧载体），仅具有少量杂质（CO，CO2<2 ppm）。材料的结构变化之后，由操作X-射线粉末衍射和X-射线吸收光谱与气相色谱相结合。通过透射电子显微镜和X射线吸收精细结构分析，探讨了Pt纳米颗粒尺寸的演变及其与CeO 2的相互作用。在DRM条件下，Pt纳米颗粒的尺寸增长，然而，它们在CeO 2载体上的再分散（通过PtOx-载体相互作用）在空气氧化期间恢复它们在连续循环中的活性。
We report on the development of a bifunctional catalyst (Pt) - oxygen carrier (Fe2O3) that integrates the dry reforming of methane (DRM) into the chemical looping-based production of hydrogen. The material exhibits a high and stable methane conversion (˜ 80%) and hydrogen yield (10.8 mmol/g catalyst-oxygen carrier) with only a small quantity of impurities (CO, CO2<2 ppm). The structural changes of the material are followed by operando X-ray powder diffraction and X-ray absorption spectroscopy coupled with gas chromatography. Insight into the evolution of the size of the Pt nanoparticles and their interaction with CeO2are probed by transmission electron microscopy and X-ray absorption fine structure analysis. Under DRM conditions, the Pt nanoparticles grow in size, however, their re-dispersion on the CeO2support (via PtOx-support interaction) during air oxidation recovers their activity in the consecutive cycle.