XPS and XRD investigation of Co/Pd/TiO₂ catalysts by different preparation methods

详细信息    查看全文

• 作者：Wei Huang ; Zhijun Zuo ; Peide Han ; Zhihong Li ; Tingdong Zhao
• 关键词：X-ray photoelectron spectroscopy (XPS) ; X-ray diffraction (XRD) ; Cobalt (Co) oxide ; TiO₂ ; Palladium (Pd) oxide ; Phase transition
• 刊名：Journal of Electron Spectroscopy and Related Phenomena
• 出版年：2009
• 出版时间：July 2009
• 年：2009
• 卷：173
• 期：2-3
• 页码：88-95
• 全文大小：1195 K

文摘

In the article, the Co/Pd/TiO₂, Co/TiO₂ and Pd/TiO₂ catalysts prepared by the impregnation and sol–gel method are studied by using X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The result shows that Co²⁺ and metal Pd may act as the active center for the direct synthesis of acetic acid from CH₄ and CO₂ by a two-step reaction sequence. When the catalysts are prepared by the sol–gel, Co²⁺ can enter the crystal lattice of the TiO₂, causing the phase transition from anatase to rutile at lower temperature, but existence of Pd²⁺ can prevent from the phase transition. When the catalysts are prepared by the impregnation, the phase transition is inhibited not only Co²⁺ but also Pd²⁺.