Abstract
A high-temperature and high-pressure nuclear magnetic resonance (NMR) probe has been developed to investigate chemical reactions in supercritical water up to 50 MPa and 500 °C. The NMR probe is of a continuous flow type with a high-pressure sample tube made of hot-pressed Si3N4 and a specially designed heat-resistant high-pressure seal. A mixing method was utilized to quickly realize the supercritical condition. The NMR probe can be used for in situ investigation of rapid reactions with several hundreds of ms half lives in continuously flowing supercritical water as well as slow equilibria under a stopped-flow condition.
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