Conversion rate of para-hydrogen to ortho-hydrogen by oxygen: implications for PHIP gas storage and utilization

被引：29

作者：

Wagner, Shawn ^{[1
]}

机构：

[1] Cedars Sinai Med Ctr, Dept Biomed Sci, Los Angeles, CA 90048 USA

来源：

MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE | 2014年 / 27卷 / 03期

关键词：

Hydrogen; Paramagnetic; Hyperpolarization; Spectroscopy; Para-hydrogen; POLARIZATION; ORDER;

D O I：

10.1007/s10334-013-0399-y

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

To determine the storability of para-hydrogen before reestablishment of the room temperature thermal equilibrium mixture. Para-hydrogen was produced at near 100 % purity and mixed with different oxygen quantities to determine the rate of conversion to the thermal equilibrium mixture of 75: 25 % (ortho: para) by detecting the ortho-hydrogen H-1 nuclear magnetic resonance using a 9.4 T imager. The para-hydrogen to ortho-hydrogen velocity constant, k, near room temperature (292 K) was determined to be 8.27 +/- A 1.30 L/mol center dot min(-1). This value was calculated utilizing four different oxygen fractions. Para-hydrogen conversion to ortho-hydrogen by oxygen can be minimized for long term storage with judicious removal of oxygen contamination. Prior calculated velocity rates were confirmed demonstrating a dependence on only the oxygen concentration.

引用

页码：195 / 199

页数：5

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