ZrO_2-Al_2O_3复合氧化物对负载Ni基催化剂合成甲烷的性能影响  

Effect of ZrO_2-Al_2O_3 Mixed Oxides on the Properties of Ni/ZrO_2-Al_2O_3 for CO Methanation

作　　者：詹国武[1] 李鑫[1] 李瑛[1] 唐浩东[1] 刘化章[1] 

机构地区：[1]浙江工业大学工业催化研究所,浙江杭州310014

出　　处：《浙江化工》2014年第12期33-37,共5页Zhejiang Chemical Industry

摘　　要：采用并流沉淀法制备了不同配比的Zr O2-Al2O3复合氧化物,并通过浸渍法制备了10%Ni/Zr O2-Al2O3催化剂,考察了复合氧化物载体的水热稳定性及Zr O2与Al2O3的配比对合成气制甲烷Ni基催化剂性能的影响。研究结果表明:Zr O2的添加能在一定程度上抑制Al2O3的水解反应,这可能是Zr O2与Al2O3形成固溶体所致。随着Zr O2含量增加,复合氧化物载体的水热稳定性先降低后升高,当Zr O2与Al2O3质量比为0.24时,载体的水热稳定性最好。不同配比的Zr O2-Al2O3复合氧化物负载Ni基催化剂的稳定性与载体的水热稳定性变化是一致的,说明载体的抗水热能力增强,催化剂结构更稳定,催化剂的活性稳定性相应增加。A series of ZrO2-Al2O3 composites supports with different ZrO2 content were prepared by co-precipitation method. Supported nickel catalysts were prepared by impregnation. The effect of the weight ratio of ZrO2 to Al2O3 on the hydrothermal of ZrO2-Al2O3 mixed composites were tested by XRD. The results showed the hydrothermal stability of ZrO2-Al2O3was better than pure Al2O3 and when the weight ratio of ZrO2 to Al2O3 was 0.24, it had optimal hydrothermal stability. The properties of Ni catalyst for carbon monoxide methanation was investigated at 350℃in atmospheric pressure, the results showed the stability time of cata-lyst was the function of the hydrothermal stability of ZrO2-Al2O3 support.

关 键 词：ZrO2-Al2O3复合氧化物 水热稳定性 NI基催化剂 甲烷化 

分 类 号：O643.36[理学—物理化学] O623.11[理学—化学]