【作者】 武鹏；

【导师】 胡瑞生；

【作者基本信息】 内蒙古大学 ， 物理化学， 2004， 硕士

【摘要】 本文以传统的柠檬酸溶胶-凝胶法制备LaMAl₁₁O₁₉（M=Fe，Mn，Cr）系列磁铅石型六铝酸盐化合物，并在该法中比较了真空干燥法和普通干燥法对六铝酸盐结构LaFeAl₁₁O₁₉形成的影响。又分别采用溶胶-凝胶法（分别用葡萄糖、麦芽糖作络合剂）、共沸蒸馏法、均匀沉淀法制备了六铝酸盐LaFeAl₁₁O₁₉；采用燃烧法、微波法合成了六铝酸盐LaMnAl₁₁O₁₉；最后制备了含镁的六铝酸盐化合物。以XRD分析了样品的晶体结构及粒径，以B．E．T方程计算其比表面积，用TPR和FT-IR技术表征了样品的还原性能和红外光谱特征，以甲烷催化氧化反应考察其催化活性。 研究结果表明，以麦芽糖作络合剂的溶胶—凝胶法和采用真空干燥法的柠檬酸作络合剂的溶胶—凝胶法均在1300℃可制备六铝酸盐LaFeAl₁₁O₁₉化合物，其中麦芽糖作络合剂更为简单、有效。采用微波法和燃烧法可以合成出单一相六铝酸盐结构LaMnAl₁₁O₁₉。为六铝酸盐的制备提出了新方法。 均匀沉淀制备的MgFeAl₁₁O₁₉甲烷燃烧催化活性较好，转化温度T₁₀和T₁₀₀分别为495℃和680℃，与目前优良国际高温燃烧催化剂的活性标准T₁₀=450℃，T₁₀₀=600℃相近。更多还原

【Abstract】 A series of manganese-containing hexaaluminates high temperature combustion catalysts have been prepared by traditional sol-gel method. At this method, it was studied that the vacuum drying and conventional over drying on the structure and activity of LaFeAl11O19 for methane combustion. Then, the catalyst of LaFeAl11O19 was prepared by glucose sol-gel, maltose sol-gel, homogeneous precipitation, and azeotropic distillation method. At the same time, LaMnAl11O19 was yielded by microwave and combustion method. The catalysts were characterized by XRD, B.E.T, H2-TPR, FT-IR and the activities of methane combustion.The results show that LaFeAl11O19 hexaaluminate could be synthesized at 1300 C for 2h by maltose as complex agent and vacuum drying in sol-gel method. Complete phase of LaMnAl11O19 was prepared by microwave and combustion methods. The activity of MgFeAl11O19 catalysts for methane oxidation is superior to that of the other catalysts. Its conversion temperature (with T10 at 495 C, T100 at 680 C) is close to the international excellent conversion temperature(with T10 at 450 C, T100at 600 C).更多还原