Sustainable Conversion of Carbon Dioxide into Diverse Hydrocarbon Fuels via Molten Salt Electrolysis
Sustainable Conversion of Carbon Dioxide into Diverse Hydrocarbon Fuels via Molten Salt Electrolysis
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DOI：
10.1021/acssuschemeng.0c08209
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发表时间：
2020-12
影响因子：
8.4
通讯作者：
Ossama Al-Juboori;Farooq Sher;S. Rahman;T. Rasheed;G. Chen;G. Chen
中科院分区：
文献类型：
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作者：
Ossama Al-Juboori;Farooq Sher;S. Rahman;T. Rasheed;G. Chen;G. Chen
近几十年来，无限制地使用化石燃料（主要用于发电）向大气中排放了大量二氧化碳，进而导致全球变暖。这里我们采用绿色技术，熔盐电化学系统由钛和低碳钢作为阴极，石墨阳极，熔融碳酸盐（Li2CO3-Na2CO3-K2CO3; 43.5:31.5:25 mol%）、氢氧化物（LiOH-NaOH; 27; 73 和 KOH-NaOH; 50:50 mol%）和氯化物（KCl-LiCl; 41-59 mol%）盐作为本研究研究了温度、原料气比例 CO2/H2O 以及不同阴极材料的使用对碳氢化合物产物以及电流效率的影响。气相色谱法和质谱法已用于分析气体产物。根据GC结果，通过使用钛阴极材料而不是低碳钢，在高分子量和长链碳氢化合物方面获得了更具体的结果。结果表明，在所有电解质中，熔融碳酸盐在 1.5V 和 425℃ 下产生高级碳氢化合物 C7H16，而所有其他电解质均产生 CH4。研究发现，在熔融碳酸盐的情况下，碳氢化合物形成和较高电流效率的最佳条件为 500oC，CO2/H2O 摩尔比为 15.6。然而，当温度从 425℃升高到 500℃时，电流效率没有变化，并且在 CO2/H2O 摩尔比为 15.6 时仍保持在 99%。尽管形成了 C7H16，但在 CO2/H2O 比为 9.2 的情况下提高温度，由于碳氢化合物生成减少，整个阴极产品的总电流效率明显从 95% 降低至 79%。因此，由于其电解转化率快且成本低（不使用催化剂），熔盐的实践对于碳氢化合物燃料形成的未来研究可能是一种令人鼓舞且有前途的技术。
In recent decades, the unlimited use of fossil fuels mostly for power generation has emitted a huge amount of carbon dioxide in the atmosphere which in return has led to global warming. Here we use green technology, the molten salt electrochemical system comprising of titanium and mild steel as a cathode with graphite anode whereas molten carbonate (Li2CO3-Na2CO3-K2CO3; 43.5:31.5:25 mol%), hydroxide (LiOH-NaOH; 27; 73 and KOH-NaOH; 50:50 mol %) and chlorides (KCl-LiCl; 41-59 mol%) salts as electrolytes This study investigates the effect of temperature, feed gas ratio CO2/H2Oand use of different cathode materials on hydrocarbon product along with current efficiencies. Gas chromatography and mass spectroscopy have been applied to analyze the gas products. According to GC results, more specific results in terms of high molecular weight and long chain hydrocarbons were obtained by using titanium cathodic material rather than mild steel. The results revealed that among all the electrolytes, molten carbonates at 1.5V and 425˚C produced higher hydrocarbons as C7H16 while all other produced CH4. The optimum conditions for hydrocarbon formation and higher current efficiencies in case of molten carbonates were found to be 500oC under a molar ratio of CO2/H2O of 15.6. However, the current efficiencies do not change on increasing the temperature from 425 to 500oCand is maintained at 99% under a molar ratio of CO2/H2O of 15.6. The total current efficiency of the entire cathodic product reduced clearly from 95 to 79% by increasing the temperature under a CO2/H2O ratio of 9.2 due to the reduction of hydrocarbon generation in this case, despite the formation of C7H16. Therefore, due to its fast electrolytic conversion rate and low cost (no use of catalyst) the practice of molten salts could be an encouraging and promising technology for future investigation for hydrocarbon fuel formation.