考察了焙烧温度对 Ni/MgO 催化剂结构及其在甲苯二氧化碳重整反应中催化性能的影响.由于 NiO-MgO 固溶体的形成,样品的 X 射线衍射谱中没有出现明显的 NiO 衍射峰,而在拉曼光谱中出现明显的散射信号. X 射线光电子能谱、氢气程序升温还原和 H2脉冲吸附结果表明,高温焙烧过程中 Ni 向催化剂体相扩散,与 MgO 发生强互相互作用,使得 Ni 物种难以还原,但部分位于催化剂表面的 Ni 物种能够还原;高温焙烧后催化剂表面活性 Ni 物种明显减少,致使催化剂重整活性降低.重整反应后,催化剂表面存在少量多核芳烃类积炭,这很可能是高温焙烧催化剂稳定性差的原因.
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