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以溶胶-凝胶法制备了一系列的BaTi1-xNixO3(x=0.025,0.075,0.125,0.175和0.225)钙钛矿型氧化物,采用XRD、TPR技术对各BaTi1-xNixO3试样的结构进行了表征,并研究了其在CH4/CO2重整反应中的应用。结果表明:在空气中800℃煅烧3h后,BaTi1-xNixO3试样获得了钙钛矿型氧化物的结构。在原位氢气还原后,BaTi1-xNixO3催化剂表面存在晶粒尺寸为10nm左右的金属单质镍。在CH4/CO2重整反应测试中,随催化剂中镍含量的增加,催化剂的活性增加,当x达到0.175后,催化剂的活性变化不显著。催化剂中BaTi1-xNixO3(x=0.175)的性能最佳。
A series of BaTi1-xNixO3 (x = 0.025,0.075,0.125,0.175 and 0.225) perovskite oxides were prepared by sol-gel method. The structure of each BaTi1-xNixO3 sample was characterized by XRD and TPR Characterization, and its application in CH4 / CO2 reforming reaction. The results show that the structure of BaTi1-xNixO3 samples is obtained after calcined at 800 ℃ for 3 h in the air. After in-situ hydrogen reduction, the surface of BaTi1-xNixO3 catalyst has a grain size of about 10nm single metal nickel. In the CH4 / CO2 reforming reaction, the activity of the catalyst increased with the increase of the nickel content in the catalyst. When x reached 0.175, the activity of the catalyst did not change significantly. The performance of BaTi1-xNixO3 (x = 0.175) in the catalyst is the best.