2019
DOI: 10.1039/c8cp07077f
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Thermodynamic limits of countercurrent reactor systems, with examples in membrane reactors and the ceria redox cycle

Abstract: Countercurrent reactors can be utilized in chemical reaction systems which involve either a reaction between flows of different phases, or reactions between flows separated by a selective permeable membrane.

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Cited by 24 publications
(16 citation statements)
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“…Furthermore, the most effective sweep gas is in counter-flow, and the calculation of the minimum flow rate of sweep gas to maintain a certain p O 2 is not trivial. As recently pointed out by Bulfin (2019) and Li et al (2019), it has previously been incorrectly determined, resulting in overly optimistic sweep gas requirements. Both Bulfin (2019) and Li et al (2019) describe thermodynamic analyses applicable to countercurrent reactors.…”
Section: Theoretical Energy Efficiency Analysismentioning
confidence: 99%
“…Furthermore, the most effective sweep gas is in counter-flow, and the calculation of the minimum flow rate of sweep gas to maintain a certain p O 2 is not trivial. As recently pointed out by Bulfin (2019) and Li et al (2019), it has previously been incorrectly determined, resulting in overly optimistic sweep gas requirements. Both Bulfin (2019) and Li et al (2019) describe thermodynamic analyses applicable to countercurrent reactors.…”
Section: Theoretical Energy Efficiency Analysismentioning
confidence: 99%
“…To account for the oxygen capacity in a given flow of sweep gas, a thermodynamic model described by Bulfin was applied, which is specific to countercurrent-flow reactors. 35 This approach guarantees compliance with the second law of thermodynamics and conservation of mass along the entire reactor by means of a dimensionless oxygen exchange coordinate, κ, defined as the number of moles of O 2 crossing the membrane up to a certain point along the length, x, per mole of oxidant fed:…”
Section: Thermodynamic Analysismentioning
confidence: 99%
“…where Bulfin detailed the full methodology in an example tailored to thermolysis in a membrane reactor with a counter-current sweep flow. 35 The countercurrent-flow thermodynamic model was implemented and solved numerically with Matlab using thermodynamic data from NIST JANAF. 36   .…”
Section: Thermodynamic Analysismentioning
confidence: 99%
“…However, for future reactor operation these short time ranges are of relevance, as shorter oxidation times allow for practical reactor operation at increased efficiency. [60] We turn now to the last five cycles, in order to analyze in more detail, the effect of Cr-incorporation and temperature on the CO 2 -splitting kinetics. However, this material did not show the highest CO yields because it requires longer exposure to CO 2 , as previously demonstrated in the literature.…”
Section: Thermochemical Fuel Production and Co 2 -Splitting Kineticsmentioning
confidence: 99%
“…[31] Thus, our results suggest that La 0.6 Sr 0.4 Cr 0.75 Mn 0.25 O 3 composition could be a promising candidate to be used as a membrane reactor for redox-augmented direct thermolysis, although some concerns respect to thermodynamic limitations of membrane reactors for direct thermolysis have been raised recently. [60] We turn now to the last five cycles, in order to analyze in more detail, the effect of Cr-incorporation and temperature on the CO 2 -splitting kinetics. In this case, the reduction temperature was maintained at 1400 °C for every half-cycle in order to guarantee the same extent of oxygen vacancy formation for each temperature at which the CO 2 -splitting reaction was evaluated.…”
Section: Thermochemical Fuel Production and Co 2 -Splitting Kineticsmentioning
confidence: 99%