Flame-made Alumina Supported Pd–Pt Nanoparticles: Structural Properties and Catalytic Behavior in Methane Combustion
Flame-made Alumina Supported Pd–Pt Nanoparticles: Structural Properties and Catalytic Behavior in Methane Combustion
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DOI：
10.1007/s10562-005-7429-y
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发表时间：
2005-10
影响因子：
2.8
通讯作者：
R. Strobel;J. Grunwaldt;A. Camenzind;S. Pratsinis;A. Baiker
中科院分区：
文献类型：
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作者：
R. Strobel;J. Grunwaldt;A. Camenzind;S. Pratsinis;A. Baiker
采用火焰喷雾热分解法制备了氧化铝负载钯铂双金属纳米粒子。采用扫描透射电镜（STEM）、CO化学吸附、氮吸附、X射线衍射（XRD）、程序升温还原（TPR）、热重分析（TGA）和扩展X射线吸收精细结构（EXAFS）等方法对材料进行了表征。对这些材料进行了甲烷催化燃烧测试，重点是贵金属颗粒的热稳定性。在火焰合成后，材料的贵金属组分主要处于氧化态，并且精细地分散在氧化铝基体上。还原得到了负载在Al_2O_3陶瓷纳米颗粒上的小尺寸Pd-Pt合金颗粒（< 5 nm）。少量铂的加入使得钯颗粒在高温下更耐烧结，并进一步降低了甲烷燃烧期间观察到的失活。
Bimetallic palladium–platinum nanoparticles supported on alumina were prepared by flame spray pyrolysis. The as-prepared materials were characterized by scanning transmission electron microscopy (STEM), CO chemisorption, nitrogen adsorption (BET), X-ray diffraction (XRD), temperature programmed reduction (TPR), thermogravimetric analysis (TGA) and extended X-ray absorption fine structure (EXAFS) spectroscopy. The materials were tested for the catalytic combustion of methane with a focus on the thermal stability of the noble metal particles. After flame synthesis the noble metal components of the materials were predominantly in oxidized state and finely dispersed on the alumina matrix. Reduction afforded small bimetallic Pd–Pt alloy particles (< 5 nm) supported on Al2O3ceramic nanoparticles. The addition of small amounts of platinum made the palladium particles more resistant against sintering at high temperatures and further lowered the deactivation observed during methane combustion.