T1 Relaxation of Methane in Mixtures with Gaseous Water

IF 4.6 Q1 CHEMISTRY, ANALYTICAL ACS Measurement Science Au Pub Date : 2024-03-04 DOI:10.1021/acsmeasuresciau.4c00001
Harm Ridder*, Wolfgang Dreher and Jorg Thöming, 
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Abstract

Synthetic, ecofriendly fuels and chemicals can be produced through Power-To-X (PtX) processes. To study such catalytic processes operando and spatially resolved, magnetic resonance imaging (MRI) is a versatile tool. A main issue in the application of MRI in reactive studies is a lack of knowledge about how the gathered signals can be interpreted into reaction data like temperature or species concentration. In this work, the interaction of methane and gaseous water is studied regarding their longitudinal relaxation time T1 and the chemical shift. To this end, defined quantities of methane-water mixtures were sealed in glass tubes and probed at temperatures between 130 and 360 °C and pressures from 6 to 20 bar. From the obtained T1 relaxation times, the collision cross section of methane with water σj,CH4-H2O is derived, which can be used to estimate the temperature and molar concentration of methane during the methanation reaction. The obtained T1 relaxation times can additionally be used to improve the timing of MRI sequences involving water vapor or methane. Further, details about the measurement workflow and tube preparation are shared.

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T1 甲烷与气态水混合物的弛豫
通过功率-X(PtX)过程可以生产出合成的环保燃料和化学品。为研究此类催化过程的操作和空间分辨率,磁共振成像(MRI)是一种多功能工具。磁共振成像在反应研究中应用的一个主要问题是,人们对如何将收集到的信号解释为温度或物种浓度等反应数据缺乏了解。在这项工作中,研究了甲烷和气态水在纵向弛豫时间 T1 和化学位移方面的相互作用。为此,将一定量的甲烷-水混合物密封在玻璃管中,在温度为 130 至 360 °C、压力为 6 至 20 巴的条件下进行探测。根据所获得的 T1 驰豫时间,可以推导出甲烷与水的碰撞截面 σj,CH4-H2O,该截面可用于估算甲烷化反应过程中甲烷的温度和摩尔浓度。此外,获得的 T1 驰豫时间还可用于改善涉及水蒸气或甲烷的磁共振成像序列的时间选择。此外,还分享了有关测量工作流程和试管制备的详细信息。
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来源期刊
ACS Measurement Science Au
ACS Measurement Science Au 化学计量学-
CiteScore
5.20
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0.00%
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0
期刊介绍: ACS Measurement Science Au is an open access journal that publishes experimental computational or theoretical research in all areas of chemical measurement science. Short letters comprehensive articles reviews and perspectives are welcome on topics that report on any phase of analytical operations including sampling measurement and data analysis. This includes:Chemical Reactions and SelectivityChemometrics and Data ProcessingElectrochemistryElemental and Molecular CharacterizationImagingInstrumentationMass SpectrometryMicroscale and Nanoscale systemsOmics (Genomics Proteomics Metabonomics Metabolomics and Bioinformatics)Sensors and Sensing (Biosensors Chemical Sensors Gas Sensors Intracellular Sensors Single-Molecule Sensors Cell Chips Arrays Microfluidic Devices)SeparationsSpectroscopySurface analysisPapers dealing with established methods need to offer a significantly improved original application of the method.
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