The ability to use molecular hydrogen, H₂, as a buffer gas in spin exchange optical pumping of noble gases enables the production of hydrogen gas containing a low percentile (5%) of hyperpolarized (HP) ¹²⁹Xe as a tracer for in situ NMR spectroscopy of hydrogenation reactions. It is demonstrated that the xenon chemical shift, observed in the porous space of Pt-containing alumina pellets, can be used to monitor the temperature changes under rapidly progressing, nonsteady-state conditions during start-up of the catalytic reaction. Standard proton MR imaging was successfully applied to provide in situ evaluation of conversion for the catalyst used in this work.

中文翻译：

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通过¹²⁹ Xe NMR光谱和质子MRI现场监测非均相催化加氢反应

在稀有气体的自旋交换光学泵浦中使用分子氢H ₂作为缓冲气体的能力使得能够生产含有低百分位数（5％）的超极化（HP）¹²⁹ Xe氢气作为示踪NMR示踪剂的氢气氢化反应的光谱学。结果表明，在含铂氧化铝颗粒的多孔空间中观察到的氙化学位移可用于监测催化反应启动过程中快速发展的非稳态条件下的温度变化。标准的质子MR成像已成功应用于本工作中所用催化剂的转化率原位评估。