Ni/Al_2O_3上甲烷二氧化碳氧气转化制备合成气的研究

REFORMING OF METHANE WITH CO2 ANDO2 TO PRODUCE SYNGAS OVER Ni/Al2O3 CATALYST

在固定床流动反应装置上，从活性组分的负载量、载体的焙烧温度、反应温度、空速等几个方面考察了Ｎｉ／Ａｌ２Ｏ３催化剂对ＣＨ４ＣＯ２Ｏ２转化制备合成气的催化活性，发现采用１１００℃焙烧的γＡｌ２Ｏ３载体制备的镍负载量为９．１７ｗ％的Ｎｉ／Ａｌ２Ｏ３催化剂，在原料气配比为ＣＨ４∶ＣＯ２∶Ｏ２＝１∶１∶０．５时，低温高空速有利于甲烷部分氧化反应的进行，而高温低空速却有利于甲烷二氧化碳重整反应的进行。通过对催化剂的寿命考察可知，Ｎｉ／Ａｌ２Ｏ３催化剂对ＣＨ４ＣＯ２Ｏ２转化制备合成气具有较好的选择性和稳定性。

The activity of Ni/Al2O3 catalyst for converting methane with carbon dioxide and oxygen to produce syngas has been studied by using a fixedbed flow apparatus It is found that low temperature and high space velocity is fit for the conversion with a CH4/CO2/O2 ratio of 1/1/0.5, but high temperature and low space is unfit for it The content of (CO+H2) in product is kept around 83￣86% during reaction of 70h at temperature 800℃, this shows that Ni/Al2O3 catalyst in which the Ni loading is 9.17w% and the carrier is calcined at 1100℃ for 5h reaction has a high stability.