Effects of different ion dopants on the structure and catalytic performance of lanthanum hexaaluminates in methane combustion
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摘要: 采用反相微乳液-共沉淀法制备了镧系六铝酸盐催化剂。体系中TX-100 作为表面活性剂，正己醇作为助表面活性剂，环己烷作为油相。分别用Fe、Co、Ni、Cu、Mg离子作为活性组分进行掺杂。通过X射线衍射、比表面积分析和扫描电镜等实验技术及甲烷燃烧对催化剂的结构和性质进行考察。结果表明，Fe离子和Mn离子共同掺杂所制备的催化剂LaMnFeAl10O19-δ具有较高的催化活性，起燃温度T10%为477℃，至674℃ 90%甲烷转化。Abstract: Lanthanum hexaaluminates doped with different metal ions (Fe, Co, Ni, Cu, and Mg) were prepared through co-precipitation of metal nitrates in the water phase of a Triton X-100 / n-hexanol / cyclohexane reverse microemulsion and used as the catalyst in methane combustion. Their structure and properties were characterized by X-ray powder diffraction (XRD), specific surface area (BET) and scanning electron microscope (SEM); the effects of ion dopants on their catalytic performance in methane combustion were investigated. The lanthanum hexaaluminates doped with Fe and Mn exhibit high catalytic activity and stability for methane combustion at high temperature; over the LaMnFeAl10O19-δ catalyst calcined at 1200℃, the ignition temperature (T10%) and complete combustion temperature (T90%) are 477℃ and 674℃, respectively.
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Key words:
- hexaaluminate /
- methane catalytic combustion /
- modification
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