The graphitic carbon strengthened synergetic effect between Pt and FeNi in CO preferential oxidation in excess hydrogen at low temperature
The graphitic carbon strengthened synergetic effect between Pt and FeNi in CO preferential oxidation in excess hydrogen at low temperature
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DOI：
10.1039/c5cy01091h
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发表时间：
2016
影响因子：
5
通讯作者：
Limin Chen;Y. Bao;Yuhai Sun;Ding Ma;D. Ye;Bichun Huang
中科院分区：
文献类型：
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作者：
Limin Chen;Y. Bao;Yuhai Sun;Ding Ma;D. Ye;Bichun Huang
制备了多种碳负载PtFeNi催化剂，并对其在过量氢气中的CO优先氧化（PROX）进行了测试。在含有1% CO、0.5% O2（体积比）和H2平衡气的原料气中，采用炭黑（CB）和碳纳米管（CNT）负载的PtFeNi催化剂，在室温下实现了100%的O2和CO转化率。N2吸附、程序升温解吸（TPD）和透射电镜（TEM）研究表明，碳的结构性质和表面化学性质决定了催化剂的粒径分布和平均粒径；在研究的粒径范围内，平均粒径对催化性能的影响不大。x射线衍射（XRD）、电阻测量和设计的催化反应结果表明，石墨碳能够通过π -π网络从贵金属中捕获电子并将电子穿梭到FeNi中不同的空间位置，使Pt与FeNi之间发生间接相互作用，从而增强协同效应，增强室温下CO氧化活性，提高Pt的利用效率。并明显降低铂的加载水平。
A variety of PtFeNi catalysts supported on carbon materials have been prepared and tested for CO preferential oxidation (PROX) in excess hydrogen. 100% O2 and CO conversions have been achieved over carbon black (CB) and carbon nanotube (CNT) supported PtFeNi catalysts at room temperature in a feed gas containing 1% CO, 0.5% O2 (volume ratio) and H2 balance gas. N2 adsorption, temperature-programmed desorption (TPD) and transmission electron microscopy (TEM) studies indicate that the carbon textural properties and surface chemistry determine the catalyst particle size distribution and mean size; but the mean particle size does not have a great influence on the catalytic performance within the investigated particle size range. X-ray diffraction (XRD), resistance measurements and the designed catalytic reaction results reveal the ability of graphitic carbon to capture and shuttle electrons from the noble metal to spatially different sites in the FeNi species through the π–π network, enables the indirect interactions between Pt and the FeNi species, leading to a strengthened synergistic effect, enhancing the CO oxidation activity at room temperature, increasing the Pt utilization efficiency, and apparently decreasing the Pt loading level.