中文摘要：

通过水热法合成Bi（26）Mo（10）O（69）纳米粉体,并作为表面改性材料用于提高氧分离膜的透氧性能。通过TG-DSC和高温XRD（HT-XRD）对前驱体的热分解行为及物相变化进行研究。采用浸渍法在BaCo（0.7）Fe（0.2）Nb（0.1）O（3-d）（BCFN）的空气侧涂覆Bi（26）Mo（10）O（69）多孔涂层。在焦炉煤气（COG）的部分氧化重整实验中,涂覆Bi（26）Mo（10）O（69）多孔涂层的BCFN膜的透氧量和CH4转化率均高于无涂层的BCFN膜。当BCFN透氧膜厚度为1mm,COG流量和空气流量分别为120 m L/min和100 m L/min时,875°C透氧速率达到16.48 m L/（min·cm^2）,比无涂层的BCFN膜高16.96%。因此,空气侧Bi（26）Mo（10）O（69）多孔涂层有望作为改性涂层提高BCFN膜的透氧性能。

英文摘要：

Bi26MO10O69 nanopowder was prepared by hydrothermal method and used as a surface modification material for oxygen separation membrane to enhance oxygen permeability. Thermal decomposition behavior and phase variation of the precursor were investigated by thermal analyzer （TG-DSC） and high-temperature X-ray diffraction （HT-XRD）. Bi26MO10O69 porous layer was coated on the air side of BaCo0.7Fe0.2Nb0.1O3-δ （BCFN） oxygen permeable membrane by dipping method. In the partial oxidation experiment of coke oven gas （COG）, the Bi26Mo10O69-coated BCFN membrane exhibits higher oxygen permeability and CH4 conversion than the uncoated BCFN membrane. When the thickness of BCFN membrane was 1 mm and the COG and air fluxes were 120 and 100 mL/min, the oxygen permeation flux reached 16.48 mL/（min.cm^2） at 875℃, which was 16.96% higher than the uncoated BCFN membrane. Therefore, Bi26MoloO69 porous layer on the air side will be promising modification coating on the oxygen permeability of BCFN membrane.