论文部分内容阅读
本文基于预混滞止弱旋火焰系统,以溶于水或乙醇的廉价硝酸盐为前驱物,采用“一步”的雾化火焰方法来合成铜基催化剂纳米颗粒。采用TEM、XRD等分析了合成颗粒的形貌及物相态,进而考察了该催化剂在甲烷催化氧化反应中的催化活性。根据TEM结果,发现乙醇做溶剂时所合成的氧化铜颗粒具有颗粒直径小且结晶度较好的特点。实验结果表明,10 nm氧化铜颗粒体现出良好的甲烷催化性能,但掺杂氧化铝后,铜基催化剂对甲烷的催化性能有所下降,其原因可归结为氧化铝对氧化铜的覆盖作用导致其有效比表面积降低。
Based on the premixed stagnation and weak-spin flame system, a low-cost nitrate-soluble precursor dissolved in water or ethanol was used to synthesize Cu-based catalyst nanoparticles by a one-step flame atomization method. The morphologies and phase states of the synthesized particles were analyzed by TEM and XRD, and the catalytic activity of the catalyst in the catalytic oxidation of methane was also investigated. According to the TEM results, it was found that the copper oxide particles synthesized by using ethanol as a solvent have the characteristics of small particle diameter and good crystallinity. The experimental results show that the 10 nm CuO particles show good catalytic performance for methane, but the catalytic performance of Cu-based catalysts for methane decreases with the addition of alumina, which can be attributed to the coating effect of alumina on copper oxide Its effective surface area decreases.