含镧镍催化剂还原性能研究

Study on reduction behavior of Ni-catalyst promoted with lanthanum oxide

用TPR、XPS和XRD技术对比研究了含镧Ni/α-Al_2O_3催化剂的还原性能。测定了两种催化剂的表现还原活化能。实验发现,两种催化剂表面上均有很少量Ni_2O_3存在。分析讨论了TPR还原曲线的特征和氧化镧促进镍催化剂还原的原因。

Reduction behaviors of the Ni-catalyst and the Ni-catalyst promoted with lanthanum oxide have been comparatively investigated by the techniques of TPR,XPS and SRD. The apparent reduction activation energy for both catalysts was determined. The experimental results showed that there was a little Ni_2O_3 on the surface of both catalysts. The feature of the TPR reduction curve was discussed and the cause of promoting reduction of Ni-catalyst by lanthanum oxide was explained.