T1 Relaxation of Methane in Mixtures with Gaseous Water
Harm Ridder, Wolfgang Dreher, Jorg Thöming
TL;DR
This study investigates how methane and water vapor interact in MRI experiments, helping improve the interpretation of reaction data in catalytic processes.
Contribution
The paper derives the collision cross section of methane with water, enabling better estimation of temperature and concentration in methanation reactions.
Findings
T1 relaxation times of methane-water mixtures were measured under various temperatures and pressures.
The collision cross section σj,CH4-H2O was derived, aiding in the estimation of methane concentration and temperature.
The results can improve MRI sequence timing for experiments involving water vapor or methane.
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…
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Taxonomy
TopicsMethane Hydrates and Related Phenomena · Phase Equilibria and Thermodynamics · Atmospheric and Environmental Gas Dynamics