Wang Haiyang, Duan Dong, Ma Chen, Shi Wenyu, Liang Miaomiao, Wang Liqun, Song Xiaoping, Gao Lumei, Sun Zhanbo
School of Science, MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, Key Laboratory of Shaanxi for Advanced Functional Materials and Mesoscopic Physics, State Key Laboratory for Mechanical Behaviour of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
Nanomaterials (Basel). 2019 May 2;9(5):683. doi: 10.3390/nano9050683.
Pt/CeO catalysts with nanoporous structures were prepared by the facile dealloying of melt-spun AlCePt (X = 0.1; 0.3 and 0.5) ribbons followed by calcination. The phase compositions and structural parameters of the catalysts were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM). The specific surface area and pore size distribution were characterized by N adsorption-desorption tests. The catalytic properties were evaluated by a three-way catalyst (TWC) measurement system. The results revealed that the dealloyed samples exhibited a nanorod framework structure. The Pt nanoparticles that formed in situ were supported and highly dispersed on the CeO nanorod surface and had sizes in the range of 2-5 nm. For the catalyst prepared from the melt-spun AlCePt ribbons, the 50% CO conversion temperature (T) was 91 °C, and total CO could be converted when the temperature was increased to 113 °C. An X-ray photoelectron spectroscopy (XPS) test showed that the Pt/CeO sample had a slightly richer oxygen vacancy; and a H temperature-programmed reduction (H-TPR) test demonstrated its superior adsorption ability for reduction gas and high content of active oxygen species. The experiments indicated that the catalytic performance could be retained without any attenuation after 130 h when water and CO were present in the reaction gas. The favorable catalytic activities were attributed to the high specific areas and small pore and Pt particle sizes as well as the strong interactions between the CeO and Pt nanoparticles. The Pt nanoparticles were embedded in the surface of the CeO nanorods, inhibiting growth. Therefore, the catalytic stability and water resistance were excellent.
通过对熔纺AlCePt（X = 0.1；0.3和0.5）薄带进行简便的脱合金化处理，随后进行煅烧，制备了具有纳米多孔结构的Pt/CeO催化剂。通过X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）和高分辨率透射电子显微镜（HRTEM）对催化剂的相组成和结构参数进行了表征。通过N吸附-脱附试验对比表面积和孔径分布进行了表征。通过三元催化剂（TWC）测量系统对催化性能进行了评估。结果表明，脱合金化后的样品呈现出纳米棒框架结构。原位形成的Pt纳米颗粒负载并高度分散在CeO纳米棒表面，尺寸范围为2-5 nm。对于由熔纺AlCePt薄带制备的催化剂，50% CO转化温度（T）为91 °C，当温度升至113 °C时，总CO可被转化。X射线光电子能谱（XPS）测试表明，Pt/CeO样品的氧空位略多；氢气程序升温还原（H-TPR）测试表明其对还原气体具有优异的吸附能力和高活性氧含量。实验表明，当反应气体中存在水和CO时，130 h后催化性能可保持无任何衰减。良好的催化活性归因于高比表面积、小孔径和Pt颗粒尺寸以及CeO与Pt纳米颗粒之间的强相互作用。Pt纳米颗粒嵌入CeO纳米棒表面，抑制了生长。因此，催化稳定性和耐水性优异。
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