| “软-硬”模板法制备的Pd/Ce0.65Zr0.35O2催化剂的结构和性能 |
| The Structure and Performance of Pd/Ce0.65Zr0.35O2 Catalysts Prepared by Soft-Hard Template Method |
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| 摘要: 采用"软-硬"模板法合成了Ce0.65Zr0.35O2(CZ),并以其为载体制备了单Pd催化剂。采用能谱分析(EDS),激光拉曼光谱(Laser Raman)对焙烧的中间产物及CZ进行了表征分析;对催化剂进行了粉末X射线衍射(XRD),X射线光电子能谱(XPS),N2吸附-脱附,储氧量(OSC),CO脉冲吸附和H2程序升温还原(H2-TPR)的表征,并对其三效催化活性进行了测试。结果表明:"软-硬"模板法在提高Pd/CZ催化剂的比表面和孔容的同时提高了催化剂中Ce3+的比例和Pd的分散性,改善了固溶体的均一性,从而显著提高了其氧化还原性能和催化性能, 使催化剂在老化前后都表现出了优异的三效催化活性。老化后对C3H8、CO、NO的起燃温度分别为318、180、210℃,低于软模板法合成的Pd/CZ催化剂,表现出优异的热稳定性。 |
| 关键词: 模板法 储氧材料 催化剂 催化性能 |
| 基金项目: 国家自然科学基金(No.21173153)资助项目。 |
| Abstract: Ce0.65Zr0.35O2 (CZ) was synthesized by soft-hard template method and its corresponding Pd only catalyst was also prepared. The intermediate product and CZ were characterized by energy dispersive spectrometer (EDS) and laser raman spectroscopy. The Pd/CZ catalyst was investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N2-physical adsorption, oxygen storage capacity (OSC), impulse CO chemisorption and H2-temperature programmed reduction (H2-TPR) technologies. It was found that soft-hard template method offered catalyst with high surface area and pore volume, enhanced the ratio of Ce3+, Pd dispersion and homogeneity of solid solution. It also imparted catalyst excellent three-way catalytic performance before and after aging. After aging, the light-off temperatures to C3H8, CO and NO were 318, 180 and 210℃ respectively, which were lower than aged catalyst synthesised by soft template, behaved strong anti-sintering property. |
| Keywords: template method oxygen storage material catalyst catalytic performance |
| 投稿时间：2015-07-15 修订日期：2015-09-07 |
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| 黄利华,陈山虎,龚茂初,陈耀强.“软-硬”模板法制备的Pd/Ce0.65Zr0.35O2催化剂的结构和性能[J].无机化学学报,2016,32(2):193-201. |
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