Temperature distribution in a gas-solid fixed bed probed by rapid magnetic resonance imaging

Raquel, Serial, M.; Benders, Stefan; Perrine, Rotzetter,; Brummerloh, Daniel L.; Metzger, Jens P.; Gross, Simon P.; Nussbaum, Jennifer; Müller, Christoph R.; Pruessmann, Klaas P.; Penn, Alexander

doi:10.1016/j.ces.2023.118457

Cited by 4 publications

(2 citation statements)

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“…With MRI, in situ and operando measurements of the reacting zone inside the opaque reactor can be performed. Different MRI techniques offer solutions to spatially map process parameters like velocities, , mass transport, temperature, − and species distributions. − All techniques have in common the fact that they make use of nuclear magnetic resonance, a phenomenon that can be utilized by applying radio frequency (RF) pulses to a specimen located in a strong magnetic field. The characteristic longitudinal ( T 1 ) and transverse ( T 2 ) relaxation times play an important role in all MRI applications, as they determine how the measured signal evolves over time and how much of the signal is still available after some time.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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T₁ Relaxation of Methane in Mixtures with Gaseous Water

Ridder,

Dreher,

Thöming

2024

ACS Meas. Sci. Au

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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 T 1 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 T 1 relaxation times, the collision cross section of methane with water σ j,CH4‑H2O is derived, which can be used to estimate the temperature and molar concentration of methane during the methanation reaction. The obtained T 1 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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