磁铅石型复合氧化物LaNi_xCo_(1-x)Al_(11)O_(19+δ)催化剂上CH_4和CO_2重整反应的研究

考察了磁铅石型复合氧化物LaNi_(0.5)M_(0.5)Al_(11)O_(19 + δ) (M = Co, Fe, Mn, Cu)和LaNi_xCo_(1-x)Al_(11)O_(19+δ)催化剂在CH_4与CO_2重整制合成 气反应中的催化活性，并应用XRD，TPR，UV-DRS技术着重表征LaNi_xCo_(1-x)Al_ (11)O_(19+δ)催化剂的结构和性能。研究结果表明该系列催化剂具有相同的晶体 结构和相似的还原稳定性。对不同过渡金属取代的催化剂来说，以LaNi_(0.5)Co_ (0.5)Al_(11)O_(19+δ)催化剂具有最好的反应活性。而对于LaNi_xCo_(1-x)Al_ (11)O_(19+δ)系列催化剂，当x ≤ 0.375时，随x值的增大，催化活性明显提高， 但在0.375 ≤ x ≤ 1.0范围内，催化活性几乎保持不变。由此得到结论，对于此 反应来说，控制Ni量在0.375 ≤ x ≤ 0.50范围内比较合适。

Study of Methane Reforming with Carbon Dioxide to Synthesis Gas over Magnetoplumbite Oxides LaNixCO1- xAl11O19+δ

The catalytic activities of magnetoplumbite oxides LaNi_(0.5)M_(0.5) Al_(11)O_(19 + δ) (M = Mn, Fe, Cu, Co) and LaNi_xCo_(1-x)Al_(11)O_(19 + δ) were studied for methane reforming with carbon dioxide to synthesis gas. The structure and physical properties of the series of LaNi_xCo_(1-x)Al_(11)O_(19 + δ) were characterized by means of XRD, TPR and UV-DRS. The results showed that this series of catalysts exhibited almost the same crystal structure and similar reduction stability. The reduced LaNi_(0.5)Co_(0.5)Al_(11)O_(19 + δ) exhibited the best catalytic activities. At x ≤ 0.375, the activities of the catalysts increased with the increase of x value. However, at 0.375 ≤ x ≤ 1.0, the activities of the catalysts were almost not changed.