制备方法对La改性的Ni/γAl2O3催化甲烷部分氧化的研究
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摘要: 采用共沉淀法和浸渍法制备La改性的Ni/γAl2O3催化剂，并用于催化甲烷部分氧化反应。共沉淀法制备的催化剂表现出较高的活性和稳定性。空速为80000h－1、800℃时甲烷的转化率接近100％，H2的选择性达99.8％，且在稳定性实验中保持15h活性变化不大。实验采用BET、TPR和XRD说明共沉淀法制备的镍基氧化铝催化剂中，La的加入提高了催化剂的比表面积，有效的抑制了大颗粒NiAl2O4的形成，降低了催化剂活性组分的还原温度，对POM显示出很高的催化活性。Abstract: La modified Ni/γAl2O3 catalysts prepared by codeposition and impregnation methods for partial oxidation of methane (POM) were studied. Catalysts prepared by codeposition method show high activity and stability because of high dispersion. The CH4 conversion was close to 100% and H2 selectivity reached 99.8% over La modified Ni/γAl2O3 catalysts with co deposition method under the condition of space velocity=80000h-1 and CH4/O2/N2=14/7/79 (in vol) at 800℃. By BET，TPR and XRD， it was found that the addition of La enhanced the surface area of the catalysts, lowed reduction temperature of active component and improved the stability of the supports. Meanwhile, the catalysts prepared with codeposition inhibited the formation of granular NiAl2O4, thus it showed high activity for POM.
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Key words:
- partial oxidation /
- methane /
- La /
- codeposition
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