An experimental system that combines the measurement of parahydrogen concentration with the assessment of ortho-para hydrogen catalyst's catalytic performance was created for this investigation. The concentration of parahydrogen was detected by a thermal conductivity detector integrated into the gas chromatograph. The catalyst sample and the generator of standard gas were integrated into one experimental setup for easier operation. Meanwhile, a new method for catalytic performance evaluation of ortho-para hydrogen catalyst was developed based on this system. This method can decrease test time and yield more valuable test results than the conventional way. Throughout the experiments, the system's dependability was increased by optimizing the utilization of the carrier gas. The deviation analysis and repeatability verification of the relevant test data showed that the relative standard deviation was less than 0.35% and the mean value of the variation coefficient was less than 0.20%, which demonstrated the method had high accuracy, stability, and reliability. Further studies have shown that the catalysts should be densely packed inside the converter and kept out of the air to maximize their catalytic activity. These pertinent findings regarding the application of ortho-parahydrogen catalysts in this study can guide the design of the ortho-parahydrogen converter in actual hydrogen liquefiers. Moreover, the method and the procedure proposed in this study may contribute to the optimization of the ortho-parahydrogen catalyst production process as well as the calibration of the parahydrogen concentration in liquid hydrogen products.

中文翻译：

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仲氢浓度及邻位氢催化剂催化性能的高精度实验测量系统及方法

为此研究创建了一个将仲氢浓度测量与邻位氢催化剂催化性能评估相结合的实验系统。通过集成到气相色谱仪中的热导检测器检测仲氢的浓度。将催化剂样品和标准气体发生器集成到一套实验装置中，以便于操作。同时，基于该系统开发了一种邻位氢催化剂催化性能评价的新方法。与传统方法相比，该方法可以减少测试时间并产生更有价值的测试结果。在整个实验过程中，通过优化载气的利用率提高了系统的可靠性。相关测试数据的偏差分析和重复性验证表明，相对标准偏差小于0.35%，变异系数平均值小于0.20%，表明该方法具有较高的准确度、稳定性和可靠性。进一步的研究表明，催化剂应密集地填充在转化器内并远离空气，以最大限度地发挥其催化活性。本研究中有关邻位氢催化剂应用的相关发现可以指导实际氢液化器中邻位氢转化器的设计。此外，本研究提出的方法和程序可能有助于邻位氢催化剂生产工艺的优化以及液氢产品中仲氢浓度的校准。