采用沉积沉淀法制备了Au/CeO2催化剂, 通过N2物理吸附、XRD、H2-TPR和HRTEM等手段研究了焙烧温度对催化剂的织构、物相、还原性能以及WGS反应活性的影响. 结果表明, 焙烧温度对催化剂活性影响显著, 低温焙烧有利于金粒子在载体表面的良好分散, 高温焙烧则会使金粒子在载体表面聚集长大. 选择适中的焙烧温度不仅可以使表面纳米金粒子获得较好的分散, 而且可使Au与载体间具有适宜的相互作用, 从而拥有较佳的WGS性能. 在本文考察范围内, 300 ℃焙烧4 h制得的样品在各个反应温度点上均表现了最高的WGS活性.
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