Thermal stability and viscosity behaviors of hot molten carbonate mixtures

Lee, Sangcho; Kim, Minseong; Hwang, Munkyeong; Kim, Kyubo; Jeon, Chung-Hwan; Song, Juhun

doi:10.1016/j.expthermflusci.2013.04.006

Cited by 14 publications

(6 citation statements)

References 16 publications

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“…Another line of reasoning is also possible, speculating on the membrane stability under specific circumstances. At temperatures above 600-700 °C molten carbonates tend to decompose into CO2 and alkaline oxides, with the decomposition rate influenced by the exact carbonate mixture and partial pressure of CO2 [33][34]. This also explains to a large extent that this temperature domain is the upper limit for the operation of Molten Carbonate Fuel Cells where CO2 is always present in large concentration.…”

Section: Benchmarking Co2 Permeationmentioning

confidence: 99%

Composite CO2 separation membranes: Insights on kinetics and stability

Patrício

Papaioannou

Ray

et al. 2017

Journal of Membrane Science

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Section: Benchmarking Co2 Permeationmentioning

confidence: 99%

Composite CO2 separation membranes: Insights on kinetics and stability

Patrício

Papaioannou

Ray

et al. 2017

Journal of Membrane Science

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“…The specific carbonate composition effects on viscosity might be expected to play a role in the bubble formation behaviour since viscosity and surface tension can affect the size of carbon dioxide bubbles in a molten carbonate melt (28). All binary compositions are expected to have a higher viscosity than the ternary eutectic (29), with a higher lithium content having a small but notable increase in the viscosity of LiK binary mixtures at temperatures up to 650°C (30). Therefore, the viscosity likely increases slightly across the lithium series investigated here.…”

Section: Liquid Viscosity Changesmentioning

confidence: 99%

Molten Carbonate Composition Effects on Carbon Electro-Oxidation at a Solid Anode Interface

Allen

White

Glenn

et al. 2014

J. Electrochem. Soc.

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The electrochemical oxidation of graphite is investigated to determine the relative influence of the composition of a molten carbonate electrolyte on a solid anode. The binary eutectics of sodium, lithium and potassium carbonates were investigated as well as ternary mixtures including the eutectic and combinations of systematically varied lithium content. It was seen that the combination of cations included in the carbonate melt can influence the electrochemical performance of graphite with binary combinations performing better than ternary in all cases. Very little change in the mechanistic behaviour was observed through tafel analysis;instead it is proposed that the observed kinetic effects are a combination of the catalytic role of all metal cations present as well as the intercalation of lithium into the solid graphite electrode. The effect of lithium intercalation is suggested to lead to a change in the graphite surface polarity which affects product gas bubble formation and dislodgement at the solid anode. Increased lithium concentration, and it is assumed intercalation, encourages smaller bubbles to form which are dislodged at a faster rate than surfaces with less lithium intercalation in the ternary electrolyte. A threshold lithium concentration is reached above approximately 65 % where the electrochemical behaviour is significantly changed and bubble formation behaviour is no longer observed.

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“…The likely presence of alkali oxides and/or hydroxides in these materials is source of additional phase interactions. processing route (Stern and Weise, 1969;Nakamura et al, 1980;Kim and Lee, 2001;Singh and Singh, 2007;Ruiz et al, 2010;Olivares, 2012;Lee et al, 2013). The presence of hydroxides, confirmed in different situations (Lapa et al, 2010;Ferreira et al, 2011a;Xing et al, 2015), is mostly disregarded.…”

Section: Salt Phase Changesmentioning

confidence: 97%

Role of salts on the electrical performance of ceria-based electrolytes: An overview

Grilo

Jamale²,

Starykevich³

et al. 2022

Front. Mater.

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This work provides an overview on established achievements and debatable findings involving Ca, Gd or Sm-doped ceria-based electrolytes, using Li2CO3, LiNO3 and Na2CO3 as sintering aid or as second phase. The performance of these materials is discussed considering the characteristics of the oxides and of the salts or derived second(ary) phases (e.g., alkali metal oxides and hydroxides, eutectic mixtures), extensively surveyed to identify influential parameters with respect to processing and electrical performance (e.g., melting and boiling points, thermal decomposition, hydrolysis). The analysis of published data highlights the possible contribution of additional charge carriers to the total conductivity, besides oxide-ion vacancies. Claimed bulk and grain boundary conductivity enhancements are deeply discussed, as well as advantages and limitations of impedance spectroscopy as characterization tool. Irrespective of controversial reasons, reports on unusual improvements of grain boundary conductivity sustain the possibility of advanced grain boundary engineering to enhance the performance of these materials.

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Thermal stability and viscosity behaviors of hot molten carbonate mixtures

Cited by 14 publications

References 16 publications

Composite CO2 separation membranes: Insights on kinetics and stability

Composite CO2 separation membranes: Insights on kinetics and stability

Molten Carbonate Composition Effects on Carbon Electro-Oxidation at a Solid Anode Interface

Role of salts on the electrical performance of ceria-based electrolytes: An overview

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