甲烷水蒸气重整和部分氧化反应制合成气

研究了Ni担载量大小，CeO₂、La₂O₃ 和ZrO₂助剂及反应条件对Ni/γ-Al₂O₃作为催化剂的甲烷水蒸气重整和部分氧化制合成气反应的影响。实验表明：在反应温度为850 ℃，甲烷空速为1.2×10⁴mL/g·h，V（CH₄）∶V（O₂）∶V（水蒸气）=2∶1∶1时，催化剂Ni含量在9％时反应性能最佳，甲烷的转化率和CO的选择性分别为97％和94％，反应3小时后有积炭存在。向Ni/γ-Al₂O₃催化剂中添加CeO₂、La₂O₃、ZrO₂助剂后发现，添加6％CeO₂对改善催化剂的活性和抗积炭能力有显著的效果，CH₄的转化率和CO的选择性分别提高到98.2％和96.4％，而且反应3小时后催化剂活性没有降低。XRD测试结果表明，添加CeO₂后的催化剂生成了NiAl₂O₄尖晶石，这有助于催化剂的抗积炭性能。

STEAM REFORMING AND PARTIAL OXIDATION OF METHANE TO PRODUCE SYNGAS 1)

It is studied the influence of different Ni content, CeO2, La2O3 and ZrO2 promoters, and reactive conditions on the reaction of steam reforming and partial oxidation of methane with catalyst of Ni/γ Al2O3 to produce syngas. The results show under the conditions of temperature 850 ℃, CH4 GHSV of 12 ×103 mL/g.h, and ratio of V(CH4):V(O2):V(Steam) = 2∶1∶1, with 9% content of catalyst Ni, the reaction performance is optical. The CH4 conversion ratio and CO selectivity are 97% and 94% respectively. Some deposited carbon appears after 3 hours of the reaction. Added the CeO2, La2O3 and ZrO2 promoters into Ni/γ Al2O3 catalyst, it is found with 6% CeO2, the obvious results are achieved not only to improve the activity of the catalyst and the ability against deposited carbon but also to make the CH4 conversion ratio and CO selectivity increasing to 98.2% and 96.4% respectively. And the activity of the catalyst doesn't decrease after 3 hours of the reaction. With XRD test, the results show added CeO2 , the catalyst produces NiAl2O4 spinel, which enhances the ability of the catalyst against deposited carbon.