催化作用
烧结
X射线吸收光谱法
部分氧化
化学
吸附
化学工程
原位
无机化学
核化学
材料科学
吸收光谱法
物理化学
有机化学
工程类
物理
量子力学
作者
Kleper de Oliveira Rocha,Wagner Costa Macedo,C.M.P. Marques,José Lino Oliveira Bueno
标识
DOI:10.1016/j.ces.2020.115966
摘要
Pt/Al2O3La2O3 catalysts were prepared by a “one-pot” sol–gel method, with different final synthesis temperatures. The catalysts were characterized by in situ X-ray absorption spectroscopy (XAS). The partial oxidation of methane (POM) reaction was used to evaluate catalyst stability. DRIFTS-CO analysis indicated the interaction of Pt with the support by Pt-O-(Al-O, La-O) bonds, which suppressed bridge CO adsorption. In situ POM-DXAS-MS analysis showed that after use in the POM reaction at about 1000 K and cooling to room temperature, the Pt/Al2O3La2O3 catalysts presented partial oxidation of Pt0, indicating the formation of a core–shell structure. The nanoparticles generated using the “one-pot” method showed higher Pt-O-Al type interaction with the support, relative to free Pt-O at the surface, resulting in high resistance to sintering in the POM reaction. The temperature used in the “one-pot” synthesis significantly influenced the Pt-O-Al interaction, which modified the resistance to sintering at 1073 K in air.
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