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摘要: 以TX-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镧催化剂。用BET、XRD进行物性表征, 以甲烷燃烧为探针反应考察了催化剂的催化活性。结果表明，反相微乳液合成催化剂的最佳成晶温度可降至1100℃。 LaMx Al12－x O19－α 中M的最佳掺杂数为1(x1)。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；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LaMnFeAl-10O19－α催化剂具有低、高温活性和高温稳定性。100h稳定性运转的转化率始终保持在99.7％，无失活现象。Abstract: Fe, Mn substituted Lahexaaluminate were synthesized by reverse microemulsion in system of water / Triton X-100 /n-hexanol / cyclohexane. The effects of substituted elements on phase, specific surface area were investigated by means of XRD and BET. The results indicated that the synthesis method could make the hexaaluminate crystal form at lower temperature, 1100℃. Among 了LaMxAl12－xO19－α catalysts, the catalyst with 1 Mn iron (x=1) was the best. The introduction of Mn could improve the catalytic activity at low temperature and make methane lightoff temperature shift to lower value. Fe substituted Lahexaaluminate could make methane completely convert at lower temperature. Fe and Mn substituted LaMnFeAl10O19α had the highest activity at both low temperature and high temperature. Stability experiment was carried out for 100h, the conversion kept99.7％, and no deactivation was observed.
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Key words:
- Fe /
- Mn /
- substituted /
- reverse microemulsion
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