A nanocatalyst composed of 10 wt% Pd supported on TiO₂ was synthesized using one-step flame spray pyrolysis with a highly-quenched premixed stagnation flame. The as-prepared nanoparticles, having a mean diameter of approximately 10 nm, were then subjected to isothermal oxidation and reduction in a fixed bed reactor. The potential roles of Pd and PdO as well as possible synergistic effects between these two active species were explored during methane conversion. The lowest light-off temperature T₂₀ was obtained at a Pd ratio of 53% and this result can be reasonably explained based on a surface Pd–PdO site pair mechanism. Additionally, differences in the hysteresis behavior during methane oxidation were noted throughout a heating–cooling cycle over the temperature range of 200–600 °C, such that the degree of hysteresis was strongly correlated with the Pd ratio.

使用一步淬火的预混合停滞火焰，通过一步火焰喷雾热解合成了由负载在TiO ₂上的10 wt％Pd组成的纳米催化剂。然后将平均直径约为10nm的所制备的纳米颗粒在固定床反应器中进行等温氧化和还原。在甲烷转化过程中，研究了Pd和PdO的潜在作用以及这两种活性物质之间可能的协同作用。最低起燃温度T ₂₀Pd比率为53％时获得的Pb-PdO可以基于表面Pd-PdO的位点对机理进行合理解释。另外，在整个200-600°C的温度范围内的加热-冷却循环中，甲烷氧化过程中的磁滞行为存在差异，因此磁滞程度与Pd比例密切相关。