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Characterization Of Pd-ceo_x Interaction On α-al_2o_3 Support

机译：α-al_2o_3载体上Pd-ceo_x相互作用的表征

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摘要

The Pd-Ce interaction was studied over CeO_2 (0.3-2.5 wt.%)-Pd (1 wt.%)/α-Al_2O_3 catalysts used in the reforming reaction of CH_4 with CO_2. The samples were characterized by using high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). The activity and selectivity behavior was in good agreement with that of other supported metal catalysts (Ni and Pd) modified with different promoters. The preliminary results of HRTEM would indicate that the CeO_x forms small crystallites around the Pd particle. The XPS analysis for the regions of Ce 3d and Pd 3d, gives an account of Ce being present mostly as Ce~(3+) and a high binding energy for Pd 3d_(5/2) (335.3 eV), an evidence of Pd-Ce chemical interaction. The Pd/Al XPS intensity ratios vs. the Pd average particle size, determined by TEM, show an excellent correlation for fresh and used catalyst. These results indicate that the diminution of the Pd/Al ratios was due to Pd sintering. Consequently, the small amounts of CeO_x species do not cover the Pd particle, in agreement with the HRTEM results. The overall results stand for the promoter action mechanism of the CeO_x for the reforming reaction with CO_2.
机译：在CH_4与CO_2的重整反应中使用的CeO_2（0.3-2.5 wt。％）-Pd（1 wt。％）/α-Al_2O_3催化剂上研究了Pd-Ce相互作用。使用高分辨率透射电子显微镜（HRTEM）和X射线光电子能谱（XPS）对样品进行表征。活性和选择性行为与用不同促进剂改性的其他负载型金属催化剂（Ni和Pd）具有很好的一致性。 HRTEM的初步结果表明，CeO_x在Pd颗粒周围形成小微晶。对Ce 3d和Pd 3d区域的XPS分析表明，Ce主要以Ce〜（3+）的形式存在，并且Pd 3d_（5/2）（335.3 eV）的结合能很高，这是Pd的证据。 -Ce化学相互作用。通过TEM测定的Pd / Al XPS强度比与Pd平均粒径之间的关系表明，新鲜和使用过的催化剂具有极好的相关性。这些结果表明Pd / Al比的减少是由于Pd烧结造成的。因此，与HRTEM结果一致，少量的CeO_x物质不能覆盖Pd颗粒。总的结果代表了CeO_x在与CO_2重整反应中的启动子作用机理。

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