MIEC Hollow-Fibre Membranes in a Plasma Membrane Reactor

Buck, F.; Wiegers, K.; Schulz, Andreas; Schiestel, Thomas

doi:10.1007/s42411-021-0445-0

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…For instance, the temperatures measured with the central thermocouple in row 3 increased from ≃690 to 990 °C by increasing the power from 1800 to 2550 W. The temperatures measured along the y-direction for 1800 and 2400 W are plotted in Figure 3a). Three regions marked in red, yellow, and green highlight the temperature ranges of negligible (T eff < 700 °C), intermediate (700 ≤ T eff < 800 °C), and significant (T eff ≥ 800 °C) oxygen permeation for LCCF membranes, as demonstrated by the experiments of Buck et al 18,28 (qualitatively shown in Figure 3b). With 1800 W, the temperatures are quite homogeneous across the measuring distance, but only the membranes placed in row 1 are expected to contribute to the removal of oxygen from the plasma effluent.…”

Section: ■ Experimental Setup and Proceduresmentioning

confidence: 77%

Proof of Concept for O₂ Removal with Multiple LCCF Membranes Accommodated in the Effluent of a CO₂ Plasma Torch

Antunes,

Wiegers,

Hecimovic

et al. 2023

ACS Sustainable Chem. Eng.

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The removal of oxygen from the effluent of a CO 2 plasma using multiple perovskite La 0.6 Ca 0.4 Co 0.5 Fe 0.5 O 3−δ hollow fiber membranes is reported. A microwave plasma torch featuring a water-cooled 5 mm nozzle operated at quasi-atmospheric pressure was used. This configuration yielded moderate CO 2 conversions (≥20%) and sufficiently large temperatures to thermally activate up to 21 membranes distributed over various rows in the plasma effluent. The CO 2 conversion was only slightly affected by the microwave power and remained unchanged, regardless of the number of membranes placed in the effluent. The amount of permeated oxygen increased both with the microwave power and with the number of membranes, since the former yields hotter effluents (>700 °C) and the latter increases the surface area available for permeation. The largest O 2 permeation flow was obtained for 21 membranes and a microwave power of 2550 W: ≃42 sccm or ≃4.8% of the available O 2 . These correspond to the highest performances of such a plasma-membrane reactor thus far. The permeated O 2 flow was also affected by the argon flow purging the membranes. Using one membrane, the flow of extracted oxygen decreased for an Ar flow below 250 sccm, while the opposite was observed with 10 membranes, yielding an increase in the oxygen flow from ≃25 to ≃28 sccm upon decreasing the total Ar flow below 2500 sccm. Key aspects that must be tackled for the design and testing of a plasma-membrane prototype that aims to remove O 2 beyond 90% are discussed.

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Section: ■ Experimental Setup and Proceduresmentioning

confidence: 77%

Proof of Concept for O₂ Removal with Multiple LCCF Membranes Accommodated in the Effluent of a CO₂ Plasma Torch

Antunes,

Wiegers,

Hecimovic

et al. 2023

ACS Sustainable Chem. Eng.

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“…Furthermore, the rapid switching between operation and stand-by demonstrated the additional strength of the developed system to cope with potential unstable energy supply when using renewable energies. Buck et al 72,73 have conducted further improvements based on this concept, and Zheng et al 74 confirmed the benefit of the unique atmosphere provided by plasma to enhance oxygen permeability. They proposed a novel dielectric barrier discharge plasma-membrane design for efficient oxygen permeation at low temperatures (Figure 3b).…”

Section: Innovation In the Otm Reactorsmentioning

confidence: 96%

“…Furthermore, the rapid switching between operation and stand‐by demonstrated the additional strength of the developed system to cope with potential unstable energy supply when using renewable energies. Buck et al 72,73 . have conducted further improvements based on this concept, and Zheng et al 74 .…”

Section: Opportunities and Future Research Directionsmentioning

confidence: 99%

Perspectives on achievements and challenges of oxygen transport dual‐functional membrane reactors

Chen,

Widenmeyer,

et al. 2023

J Am Ceram Soc.

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The integration of membrane separation processes with chemical reactions through oxygen transport dual‐functional membrane reactors has attracted significant attention due to the potential for process intensification, which also can create a synergy between the two units. This approach holds promise for promoting green chemistry principles by reducing energy consumption and environmental pollution. Despite its potential, a comprehensive review of recent advancements exploring the full potential of oxygen transport dual‐functional membrane reactors (coupling two distinct reactions) in enhancing membrane performance is currently lacking. To address this gap, this perspective article presents various concepts and principles of oxygen transport dual‐functional membrane reactors and provides an overview of recent advances and applications. Additionally, the challenges and opportunities for future research to enhance the efficiency of the process toward industrialization are discussed and highlighted. These include developing novel oxygen transport membrane materials, optimizing membrane engineering, innovating membrane reactor design, and exploring new applications and reaction mechanisms.

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“…The lowest measurement position, MP1, is 14 cm above the lower resonator board. At this height, O 2 -conducting ceramic hollow fiber membranes for gas separation can be introduced into the tubular reactor, as Chen et al and Buck et al have shown [23][24][25]. The CO 2 conversion is therefore of great interest at this point.…”

Section: Description Of the Plasma Torchmentioning

confidence: 99%

Determination of the Conversion and Efficiency for CO₂ in an Atmospheric Pressure Microwave Plasma Torch

Wiegers

Schulz

Walker

et al. 2022

Chemie Ingenieur Technik

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In a 2.45 GHz plasma torch, carbon dioxide (CO2) has been converted into carbon monoxide (CO) and oxygen (O2) at atmospheric pressure. The conversion and the efficiency of the plasma have been determined using two independent measuring methods: mass spectrometry and Fourier transform infrared absorption spectroscopy. The conversion depends on the measurement position in the exhaust gas duct. The conversion values at the beginning of the exhaust gas duct are significantly higher (maximum conversion is 22 %) than in the thermalized state at the end of the duct. In the cold, thermalized state of the gas, the maximum conversion rate is 8 % at 1.5 eV molecule−1. The maximum efficiency of 25 % is achieved at approximatively 0.6 eV molecule−1 operating at a microwave power of 0.48 kW and a mass flow of 12 slm CO2.

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MIEC Hollow-Fibre Membranes in a Plasma Membrane Reactor

Cited by 6 publications

References 12 publications

Proof of Concept for O₂ Removal with Multiple LCCF Membranes Accommodated in the Effluent of a CO₂ Plasma Torch

Proof of Concept for O₂ Removal with Multiple LCCF Membranes Accommodated in the Effluent of a CO₂ Plasma Torch

Perspectives on achievements and challenges of oxygen transport dual‐functional membrane reactors

Determination of the Conversion and Efficiency for CO₂ in an Atmospheric Pressure Microwave Plasma Torch

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MIEC Hollow-Fibre Membranes in a Plasma Membrane Reactor

Cited by 6 publications

References 12 publications

Proof of Concept for O2 Removal with Multiple LCCF Membranes Accommodated in the Effluent of a CO2 Plasma Torch

Proof of Concept for O2 Removal with Multiple LCCF Membranes Accommodated in the Effluent of a CO2 Plasma Torch

Perspectives on achievements and challenges of oxygen transport dual‐functional membrane reactors

Determination of the Conversion and Efficiency for CO2 in an Atmospheric Pressure Microwave Plasma Torch

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Resources

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Proof of Concept for O₂ Removal with Multiple LCCF Membranes Accommodated in the Effluent of a CO₂ Plasma Torch

Proof of Concept for O₂ Removal with Multiple LCCF Membranes Accommodated in the Effluent of a CO₂ Plasma Torch

Determination of the Conversion and Efficiency for CO₂ in an Atmospheric Pressure Microwave Plasma Torch