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应用 XRD,TPR,H2 -TPD技术研究焙烧温度对 Ni O/δ-Al2 O3催化剂性能的影响。结果表明 ,随着焙烧温度的增高 ,Ni O与载体 Al2 O3之间相互作用逐渐增强 ,直至最后生成 Ni Al2 O4 尖晶石。同时表明 ,随着焙烧温度的提高 ,催化剂的还原温度明显增高。另外 ,TPR结果还表明 Ni Al2 O4 仅仅是与载体发生强相互作用的那部分 Ni O进一步进入 Al2 O3晶格的结果 ,而游离态的 Ni O不参与形成 Ni Al2 O4 。通过催化剂的甲烷部分氧化制合成气反应性能评价 ,发现低温焙烧样品活性较高 ,与上述表征结果相关联 ,说明还原态的 Ni物种是该反应的活性相。
The effects of calcination temperature on the performance of NiO / δ-Al2 O3 catalysts were investigated by XRD, TPR and H2-TPD techniques. The results show that with the increase of calcination temperature, the interaction between NiO and support Al 2 O 3 gradually increases until finally Ni Al 2 O 4 spinel is formed. At the same time, it shows that with the increase of calcination temperature, the reduction temperature of the catalyst is obviously increased. In addition, the TPR results also show that Ni Al 2 O 4 is only the result of the further part of the Ni O entering into the Al 2 O 3 lattice with strong interaction with the support, while the free NiO does not participate in the formation of Ni Al 2 O 4. The catalytic performance of partial oxidation of methane to syngas by the catalyst was evaluated. It was found that the activity of the sample calcined at low temperature was higher than that of the above sample, indicating that the reduced Ni species is the active phase of the reaction.