Abstract: Single metal and multiple metals doped La-hexaaluminate were synthesized by reverse microemulsion in the system of water / Triton X-100 / n-hexanol / cyclohexane. The effects of doped elements on the phase，specific surface area and activity for methane combustion were investigated by means of XRD and BET. The results indicated that among LaMxAl12-xO19 catalysts，the catalyst with a Mn iron (x=1) was the best，The introduction of single Mn could improve the catalytic activity at a low temperature and make methane light-off temperature shift to a lower value; Single Fe doped La-hexaaluminate could make methane completely convert at a lower temperature; Fe and Mn doped La-hexaaluminate had the highest activity at both low temperature and high temperature; The stability of LaMnFeAl10O19 at a high temperature was also excellent.

摘要： 在TX-100/正己醇/环己烷组成的反相微乳液体系中，采用反相微乳-共沉淀法制备了系列单相金属掺杂（M为一种金属）和复合金属（M为两种或两种以上金属）掺杂的六铝酸镧（LaM_xAl_12-xO19）催化剂。用BET、XRD、SEM进行了物性表征，以甲烷燃烧为探针反应考察了催化剂的催化活性，分析了不同的离子取代Al³⁺对六铝酸镧的比表面积和活性的影响。结果表明：单金属Mn的存在可以降低甲烷的起燃温度，使催化剂具有良好的低温活性，且Mn的最佳掺杂数为1；单金属Fe掺杂的六铝酸镧催化剂具有较低的完全转化温度；而Fe、Mn共同掺杂的LaMnFeAl₁₀O₁₉催化剂具有优越的低、高温活性和高温稳定性。