A comparative study of electrodes in the direct synthesis of CH4 from CO2 and H2O in molten salts

Ji, Deqiang; Liu, Yue; Li, Zhida; Yuan, Dandan; Yang, Guanjian; Jiang, Mengpei; Wang, Yuhang; Yu, Yongze; Wu, Hongjun

doi:10.1016/j.ijhydene.2017.04.152

Cited by 18 publications

(38 citation statements)

References 27 publications

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“…Moreover, recent investigations also showed the production of syngas (CO, H2) and methane by employing molten carbonates (Li2CO3-Na2CO3-K2CO3) 24,36 . There is lack of literature of finding suitable molten salt electrolyte for the co-electrolysis of CO2 and H2O to produce hydrocarbon fuels (CH4 or longer chain).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Production of Sustainable Hydrocarbon Fuels from CO₂ Co-electrolysis in Eutectic Molten Melts

Al-Juboori

Sher

Khalid

et al. 2020

ACS Sustainable Chem. Eng.

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Due to the heavy reliance of people on the limited fossil fuel as energy resources, global warming has increased to severe levels due to huge CO2 emission into the atmosphere. To mitigate this situation, a green method is presented here for the conversion of CO2/H2O into sustainable hydrocarbon fuels via electrolysis in eutectic molten salts ((KCl-LiCl; 41:59 mol%), (LiOH-NaOH; 27:73 mol%), (KOH-NaOH; 50:50 mol%), (Li2CO3-Na2CO3-K2CO3; 43.5:31.5:25 mol%)) at the conditions of 1.5-2 V and 225-475 o C depending upon molten electrolyte used. Gas chromatography (GC) and GC-MS techniques were employed to analyse the content of gaseous products. The electrolysis results in hydrocarbon production with maximum 59.30, 87.70 and 99% faraday efficiency in case of molten chloride, molten hydroxide and molten carbonate electrolytes under the temperature of 375, 275 and 425 o C 2 respectively. The Gas chromatography (GC) with FID and TCD detectors and GC-MS analysis confirmed that the H2 and CH4 were the main products in case of molten chlorides and hydroxides at 2 V applied voltage while longer hydrocarbons (>C1) were obtained only in molten carbonates at 1.5 V. Through this manner, electricity is transformed into chemical energy. The heating values obtained from the produced hydrocarbon fuels are satisfactory for further application. The practice of molten salts could be a promising and encouraging technology for further fundamental investigation for sustainable hydrocarbon fuel formation with more product concentrations due to its fast-electrolytic conversion rate without the use of catalyst.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Production of Sustainable Hydrocarbon Fuels from CO₂ Co-electrolysis in Eutectic Molten Melts

Al-Juboori

Sher

Khalid

et al. 2020

ACS Sustainable Chem. Eng.

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“…39,40 The actual decomposition voltage was greater than the theoretical value, E(decomposition potential) ¼ E(theory decomposition voltage) + E(overpotential) + IR. According to our previous study, 32,33 metal deposition occurs at higher voltages and, when the voltage exceeds 2.5 V, the CO content showed a signicant downward trend. Therefore, an electrolysis voltage range of 1.6-2.6 V was determined.…”

Section: Determination Of Optimal Temperature and Operating Voltagementioning

confidence: 65%

“…When KOH serves as the hydrogen source, K metal required a lower potential than H 2 , meaning that K metal deposition could become a side reaction. 32 Fig. 1b shows the calculated thermodynamic electrolysis potential of various hydroxides as a function of temperature for syngas formation.…”

Section: Resultsmentioning

confidence: 99%

“…The CO content then gradually declined at temperature of 550-600 C, while the hydrogen content increased with increasing temperature (550-600 C). This phenomenon was caused by high-temperature activation of the Li 1.43 Na 0.36 K 0.21 CO 3 electrolyte and hydrogen formation was due to the activity of growth 32 The CO content of the system reached a maximum of $61.7% while the H 2 content was 32.8% at 1.8 V and 550 C. The adjustable range of the H 2 /CO molar ratio was 0.53-7.76 in the Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 system with a mass ratio of 61 : 22 : 17.…”

Section: Effect Of Mixed Molten Carbonate Compositions On Syngas Prodmentioning

confidence: 99%

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Syngas production: diverse H₂/CO range by regulating carbonates electrolyte composition from CO₂/H₂O via co-electrolysis in eutectic molten salts

Liu

Yuan

et al. 2017

RSC Adv.

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“…In this respect, some recent studies on electrolysis and co‐electrolysis of CO 2 ‐H 2 O gas mixtures in mixed carbonate‐hydroxide melts can be used to confirm indirectly our results. Studies conducted in the range 500–600 °C indicate that gaseous products rich of methane or syngas may be efficiently produced by high‐voltage electrolysis (voltage > 1.6 V), although hydrogen becomes the largely predominant gaseous product when the electrolysis temperature is lower than 550 °C …”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of aluminide diffusion coatings in low temperature molten carbonate electrolysis environments

Frangini

Seta

Paoletti

et al. 2018

Materials & Corrosion

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Interest on low‐temperature molten carbonate electrolysis processes (T < 600 °C) for advanced energy conversion and storage applications appears to be progressively growing in literature. However, the corrosion of metallic materials in molten carbonate salts in equilibrium with the acidic CO2‐rich electrolysis gas atmospheres has been scarcely studied. In this work, the corrosion stability of a low‐activity FeAl aluminide diffusion coated 316 L stainless steel has been tested in a ternary carbonate eutectic mixture Li2CO3‐Na2CO3‐K2CO3 by 48 h‐immersion tests at 500 °C under CO2 atmosphere. Before the corrosion testing, the coated steel samples were pre‐oxidized in air at 750 °C in order to generate a protective thin alumina film on the aluminide coating surface. The salt immersion results indicate that FeAl aluminide coatings are not stable in acid molten carbonate environments due to rapid transformation of the pre‐existing alumina film into a non‐protective mixed Fe‐Al oxide crystalline layer. Corrosion degradation has been found to consist of both general and localized forms of attack. Factors affecting FeAl aluminide coating corrosion have been analyzed and discussed in detail.

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A comparative study of electrodes in the direct synthesis of CH4 from CO2 and H2O in molten salts

Cited by 18 publications

References 27 publications

Electrochemical Production of Sustainable Hydrocarbon Fuels from CO₂ Co-electrolysis in Eutectic Molten Melts

Electrochemical Production of Sustainable Hydrocarbon Fuels from CO₂ Co-electrolysis in Eutectic Molten Melts

Syngas production: diverse H₂/CO range by regulating carbonates electrolyte composition from CO₂/H₂O via co-electrolysis in eutectic molten salts

Corrosion behavior of aluminide diffusion coatings in low temperature molten carbonate electrolysis environments

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A comparative study of electrodes in the direct synthesis of CH4 from CO2 and H2O in molten salts

Cited by 18 publications

References 27 publications

Electrochemical Production of Sustainable Hydrocarbon Fuels from CO2 Co-electrolysis in Eutectic Molten Melts

Electrochemical Production of Sustainable Hydrocarbon Fuels from CO2 Co-electrolysis in Eutectic Molten Melts

Syngas production: diverse H2/CO range by regulating carbonates electrolyte composition from CO2/H2O via co-electrolysis in eutectic molten salts

Corrosion behavior of aluminide diffusion coatings in low temperature molten carbonate electrolysis environments

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Electrochemical Production of Sustainable Hydrocarbon Fuels from CO₂ Co-electrolysis in Eutectic Molten Melts

Electrochemical Production of Sustainable Hydrocarbon Fuels from CO₂ Co-electrolysis in Eutectic Molten Melts

Syngas production: diverse H₂/CO range by regulating carbonates electrolyte composition from CO₂/H₂O via co-electrolysis in eutectic molten salts