摘要
用粒度为 5 mm的 α- Al2 O3 、β- Al2 O3 、γ- Al2 O3 为载体 ,用浸渍法制备了 10 % (质量 ) Ni基催化剂。在固定床流动反应器中 ,在反应温度 5 0 0～ 85 0℃ ,大空速和不同的 CH4/O2 摩尔比下 ,测定了该催化剂用于甲烷部分氧化制合成气的活性和 CO选择性。 5 0 0℃用 H2 对催化剂还原 2 h后 ,进行活性测试结果表明 ,10 % Ni/β- Al2 O3 ,Ni/γ- Al2 O3 对 POM反应无活性 ,只有 10 % Ni/α- Al2 O3 对 POM反应有活性。TPR测试结果表明 ,这是由于 10 % Ni/β- Al2 O3 和 Ni/γ- Al2 O3 催化剂在 70 0℃以下未被还原所致。另外 ,合成气的生成速率和 CO选择性均随反应温度和空速的增大而增大 ,并在 CH4/O2 摩尔比为
Catalysts with 10%(mass) Ni used in experiments were prepared by impregnation methods and 5mm α Al 2O 3? β Al 2O 3? γ Al 2O 3 as supports. The methane conversion and CO selectivity were measured on this kind of catalysts under reaction temperature of 500-850℃, high space velocity and different CH 4/O 2 mole ratios in a continuous fixed bed reactor. The results showed that partial oxidation of methane doesn't occur on 10% Ni/ β Al 2O 3 and Ni/ γ Al 2O 3 catalysts after these two catalysts were reduced by H 2 at 500℃ for 2 hours. The TPR profile of the catalysts proved that the reduction did not occur on 10% Ni/ β Al 2O 3 and Ni/ γ Al 2O 3 catalysts under 700℃ as well. On 10% Ni/ α Al 2O 3 catalysts, the formation rate of syngas and CO selectivity increased with the increase of the reaction temperature and the space velocity and the best CH 4/O 2 mole ratio for CO selectivity is 2.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2002年第1期36-41,共6页
Chemical Reaction Engineering and Technology
基金
国家自然科学基金资助项目 (编号 2 0 10 6 0 13)
