As an important application of microfluidic chips, liquid chemical microthrusters need to introduce a structured catalyst block in the design process. In this paper, a structured silver catalyst is used to promote the decomposition of hydrogen peroxide in microfluidic chips. In addition, the temperature of the microchannel on the microfluidic chip is controlled in real time by the planar electric heating plate, and the temperature of the catalytic decomposition reaction of the hydrogen peroxide reaction liquid is monitored in real time by an infrared thermal imaging camera. The reaction rate of catalytic decomposition of hydrogen peroxide was indirectly detected online by an ultraviolet-visible spectrophotometer. The experimental results show that when the temperature of the microfluidic chip exceeds 70 °C, the thermal decomposition rate of hydrogen peroxide in the microchannel on the preheating region gradually dominates and cannot be ignored. When the quadratic regression orthogonal experiment was used to study the influence of 1/T, ln t and ln c₀ on ln r, it was found that ln c₀ had a significant effect on ln r, and (1/T) × ln t and (ln t)² had a significant effect on ln r. And within the experimental study range, when T = 333.16 K, t = 0.02 ms and c₀ = 3 mol L⁻¹, the maximum value of ln r was obtained, and it was 454.5 ± 8.2 mol L⁻¹ s⁻¹. In the single factor study, it can be seen that the temperature of the hot plate and the initial concentration of hydrogen peroxide are positively correlated with the reaction rate of hydrogen peroxide-catalyzed decomposition. The reaction rate of catalytic decomposition of hydrogen peroxide decreases first and then increases with the increase of flow rate. The study of the thermal effect and catalytic performance of microfluidic chips provides a reference value for the design and application of microfluidic chips in microthrusters.

中文翻译：

---

通道型银催化剂微流控芯片中过氧化氢分解的反应速率和热效应

液体化学微推进器作为微流控芯片的重要应用，在设计过程中需要引入结构化催化剂块。本文采用结构银催化剂来促进微流控芯片中过氧化氢的分解。另外，微流控芯片上微通道的温度由平面电加热板实时控制，双氧水反应液催化分解反应的温度由红外热像仪实时监测。采用紫外-可见分光光度计间接在线检测过氧化氢催化分解反应速率。实验结果表明，当微流控芯片温度超过70℃时，预热区域微通道内过氧化氢的热分解速率逐渐占主导地位，不可忽视。采用二次回归正交实验研究1/ T、ln  t、ln  c ₀对ln  r的影响时发现，ln  c ₀对ln r有显着影响 ，且(1/ T ) × ln  t和 (ln  t ) ²对 ln r有显着影响 。并且在实验研究范围内，当T =333.16 K、t =0.02 ms、c ₀ = 3 mol L ^-1时，ln r达到最大值 ，为454.5 ± 8.2 mol L ^-1 s ^-1。在单因素研究中可以看出，热板温度和过氧化氢初始浓度与过氧化氢催化分解的反应速率呈正相关。过氧化氢催化分解反应速率随着流量的增加先降低后增加。微流控芯片热效应和催化性能的研究为微流控芯片在微推进器中的设计和应用提供参考价值。