Abstract:

In the methanol autothermal reforming reaction, the required heat is provided by the methanol oxidation reaction, so the activity of the methanol oxidation catalyst directly affects the yield of hydrogen. Pt/γ?Al₂O₃ catalysts have attracted wide attention because of its high reactivity, but their stability is poor, and the Pt activity center is easy to agglomerate. In order to solve the above problems, Pt/γ?Al₂O₃ catalysts were prepared by rotary microemulsion, and Pt/γ?Al₂O₃ catalysts were characterized by BET, XRD and other methods, and the effects of cyclohexane mass fraction, mass ratio of PEG?600 and n?butanol on the oxidation activity of methanol were investigated. The results show that the microemulsion method could improve the dispersion and utilization rate of the active components. By changing the mass fraction of cyclohexane and the mass ratio of PEG?600 to n?butanol, the active component Pt can be uniformly and firmly loaded on γ?Al₂O₃, and the sintering resistance of the catalyst can be improved. The Pt/γ?Al₂O₃ catalyst prepared under the condition of cyclohexane mass fraction of 50% and the mass ratio of PEG?600 to n?butanol is 3∶7, and the catalytic activity of methanol oxidation can reach 88%.

Key words: Methanol oxidation, Rotary microemulsion method, Self?heating reforming, Catalytic oxidation, Pt?based catalysts

摘要：

在甲醇自热重整反应中，所需的热量由甲醇氧化反应提供，因此甲醇氧化催化剂的活性直接影响氢气的产率。Pt/γ?Al₂O₃催化剂因其较高的反应活性而被广泛关注，但其稳定性较差，Pt活性中心易团聚。为了解决上述问题，采用旋蒸微乳法制备Pt/γ?Al₂O₃催化剂，通过BET、XRD等方法对Pt/γ?Al₂O₃催化剂进行了表征，并考察了环己烷质量分数、PEG?600（聚乙二醇600）与正丁醇的质量比对催化甲醇氧化活性的影响。结果表明，旋蒸微乳法可提高活性组分的分散度和利用率；通过改变环己烷质量分数、PEG?600与正丁醇的质量比，可使活性组分Pt均匀、牢固地负载在γ?Al₂O₃上，提高催化剂的抗烧结能力；在环己烷质量分数为50%、PEG?600与正丁醇的质量比为3∶7的条件下制备的Pt/γ?Al₂O₃催化剂，催化甲醇氧化活性可达88%。

关键词: 甲醇氧化, 旋蒸微乳法, 自热重整, 催化氧化, Pt基催化剂