制备方法对Ni/MgO/Al2O3催化剂在甲烷与二氧化碳重整反应活性的影响

采用浸渍－还原法制备的Ｎｉ／ＭｇＯ／Ａｌ２Ｏ３在ＣＨ４与ＣＯ２重整制合成气反应中显示出良好的催化性能和一定的抗积炭能力；在１０２３Ｋ下流动反应气氛中连续运转１００ｈ，未见活性下降，ＣＨ４及Ｃ弦均为９０％左右，ＣＯ收率高于９０％，实验还发现，ＣＨ４转化率随着原料气中ＣＯ２浓度的增加而升高，当Ｖ（ＣＯ２）／Ｖ（ＣＨ４）＝２时ＣＨ４转化率可达１００％，通过ＢＥＴ比表面积测定及ＸＲＤ，ＴＥＭ等分析手段，比

Influence of Preparation Methods on Catalytic Performance of Ni/MgO/Al2O3 in CO2 Reforming of CH4

MgO modified Al 2O 3 supported Ni catalysts have been prepared by novel impregnation reduction method and their catalytic performance in CO 2 reforming of CH 4 to syngas has been evaluated. The results indicate that the catalysts show high activity and high resistance to coke deposition. After reaction at 1?023 K for 100 h, the conversion of CH 4 and CO 2 was over 90% respectively with CO yield of about 90%. In addition, the CH 4 conversion increases with CO 2 amount in the feed gas, for example, CH 4 conversion of 100% is observed at 1?023 K under the condition of V (CO 2)/ V (CH 4)=2. BET surface area, XRD and TEM have been used to study the influence of preparation methods on the catalyst performance. The results reveal that the Ni/MgO/Al 2O 3 catalyst prepared by impregnation reduction method has larger surface area and smaller particle size in comparison with the catalyst prepared by impregnation calcination reduction method.