【摘要】 以Triton X-100/正己醇/环己烷组成的反相微乳液为媒介,采用反相微乳-共沉淀法制备系列金属掺杂的六铝酸盐LaMnMxAl11-xO19-δ(M为Ni,Co)催化剂,用BET,XRD进行物性表征,确定最佳焙烧温度,以甲烷燃烧为探针反应考察催化剂的催化活性,以Ni掺杂的六铝酸盐催化剂为对象,研究了反相微乳体系中前驱溶液浓度对催化剂性能的影响。结果表明,1 200℃左右可以形成完整的六铝酸盐晶型,并具有较高的催化性能;金属Co的存在可以促进六铝酸盐晶相的形成,而降低成晶温度;金属Ni可以明显提高催化剂的高温活性。反相微乳液中前驱液离子浓度对催化剂的比表面积、粒径及催化活性有一定影响。更多还原

【Abstract】 Substituted hexaaluminate catalysts LaMnM_xAl_11-xO_19-δ（M is Co,Ni） were synthesized by reverse microemulsion in system of water/Triton X-100/n-hexanol/cyclohexane.The catalysts were characterized by XRD and BET.Catalytic activity was examined by methane combustion,Ni substituted hexaaluminates were employed to study the effect of the concentration of precursor solution in the microemulsion on the catalysts.The results indicate that Mn-substituted hexaaluminate phase can completely form at about 1 200 ℃ and it has good catalytic activity.Co-substituted catalysts can form a single phase of hexaaluminate LaMnCoAl₁₀O_19-δ and decrease the crystallization temperture and Ni-substituted catalysts have the highest activity at high temperature.The concentration of precursor solution in reverse microemulsion can influence the specific surface area,particle size and catalytic activity.更多还原