詹吉山, 郭翠梨, 张俊涛, 张金利. TiO2对Ni/Al2O3催化剂CO甲烷化性能的影响[J]. 燃料化学学报（中英文）, 2012, 40(05): 589-593.
引用本文: 詹吉山, 郭翠梨, 张俊涛, 张金利. TiO2对Ni/Al2O3催化剂CO甲烷化性能的影响[J]. 燃料化学学报（中英文）, 2012, 40(05): 589-593.
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ZHAN Ji-shan, GUO Cui-li, ZHANG Jun-tao, ZHANG Jin-li. Effects of TiO2 promoter on the catalytic performance of Ni/Al2O3 in CO methanation[J]. Journal of Fuel Chemistry and Technology, 2012, 40(05): 589-593.
Citation: ZHAN Ji-shan, GUO Cui-li, ZHANG Jun-tao, ZHANG Jin-li. Effects of TiO2 promoter on the catalytic performance of Ni/Al2O3 in CO methanation[J]. Journal of Fuel Chemistry and Technology, 2012, 40(05): 589-593.
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TiO2对Ni/Al2O3催化剂CO甲烷化性能的影响

Effects of TiO2 promoter on the catalytic performance of Ni/Al2O3 in CO methanation

    摘要
  • 摘要: 采用溶胶凝胶法制备了一系列不同TiO2含量的TiO2-Al2O3复合载体,并通过浸渍法制备了NiO/TiO2-Al2O3催化剂。分别考察了不同TiO2含量的NiO/TiO2-Al2O3催化剂及反应温度对CO甲烷化催化性能的影响。实验结果表明,当复合载体中TiO2质量分数为30%,反应温度为350～450 ℃时,催化剂催化活性较高。利用N2吸附-脱附(BET)、X射线衍射(XRD)及H2程序升温还原(H2-TPR)等手段对催化剂物化性能进行了表征。结果表明,加入适量的TiO2能抑制镍铝尖晶石NiAl2O4物种的生成,改善NiO的表面分散性能,避免大晶粒NiO的形成,也改善了催化剂的还原性能,从而提高催化剂的CO甲烷化活性。

     

    Abstract: A series of TiO2-Al2O3 composite supports with different TiO2 contents were prepared by sol-gel method and then supported nickel catalysts (NiO/TiO2-Al2O3) were obtained by impregnation with NiO/TiO2-Al2O3 as the supports. The effects of TiO2 promoter content and reaction temperature on the performance of TiO2-Al2O3 catalysts in CO methanation were investigated. The results showed that the nickel catalyst supported on the TiO2-Al2O3 composite containing 30% TiO2 exhibits the highest activity for CO methanation under a temperature from 350 to 450 ℃. BET, XRD and H2-TPR characterization results indicated that the addition of TiO2 promoter can restrain the formation of Ni/Al2O4, improve the dispersion of NiO, avoid the formation of large NiO granules, and make NiO reduction easier, which can then enhance the activity of the nickel catalysts in CO methanation.

     

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