The effect of variable operating parameters for hydrocarbon fuel formation from CO2 by molten salts electrolysis
The effect of variable operating parameters for hydrocarbon fuel formation from CO2 by molten salts electrolysis
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DOI：
10.1016/j.jcou.2020.101193
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发表时间：
2020-09-01
影响因子：
7.7
通讯作者：
Chen, George Z.
中科院分区：
文献类型：
--
作者：
Al-Juboori, Ossama;Sher, Farooq;Chen, George Z.
随着世界人口的增长，二氧化碳的排放量日益增加，这导致了大气和环境的破坏。在将大气中的二氧化碳转化为碳氢化合物燃料方面，采用了包括核能和地热能在内的传统不同策略。然而，由于后处理工厂产生的大量放射性废物，这些方法非常复杂。本研究考察了温度（200-500℃）、电压（1.5-3.0 V）、原料气（CO2/H2O）组成1、9.2和15.6等参数对熔融碳酸盐（Li2CO3-Na2CO3-K2CO3; 43.5:31.5:25 mol%）和氢氧根（LiOH-NaOH； 27:73和KOH-NaOH； 50:50 mol%）盐中烃类燃料形成的影响。气相色谱结果表明，在3v、275℃的熔融氢氧化物（LiOH-NaOH）中，CH4是主要的烃产物，CO2/H2O比较低（9.2）。结果还表明，当电解温度从425℃提高到500℃时，在CO2/H2O比为9.2时，烃类碳原子数增加到7个（C7H16），产率为1.5 μ mol/h cm(2)。此外，由于碳的形成前景，在1.5 V时电解生成碳氢化合物比在2 V时更可行。而在氢氧化物中，当施加电压从2.0 ~ 3.0 V增加时，CH4的产率（0.80 ~ 20.40 mu mol/h cm(2)）增加，而电流效率（2.30% ~ 0.05%）降低。在275℃、2v、CO2/H2O比为1的条件下，氢氧化钠溶液（LiOH-NaOH; 27:73 mol%）中的副产物H-2的电流效率最高，达到99.5%。因此，熔融盐的实践由于其快速的电解转化率和不使用催化剂的特点，可能是一种有前途的和令人鼓舞的技术，可以进一步研究碳氢化合物燃料形成的基础。
The emission of CO2 has been increasing day by day by growing world population, which resulted in the atmospheric and environmental destruction. Conventionally different strategies, including nuclear power and geothermal energy have been adopted to convert atmospheric CO2 to hydrocarbon fuels. However, these methods are very complicated due to large amount of radioactive waste from the reprocessing plant. The present study investigated the effect of various parameters like temperature (200-500 degrees C), applied voltage (1.5-3.0 V), and feed gas (CO2/H2O) composition of 1, 9.2, and 15.6 in hydrocarbon fuel formation in molten carbonate (Li2CO3-Na2CO3-K2CO3; 43.5:31.5:25 mol%) and hydroxide (LiOH-NaOH; 27:73 and KOH-NaOH; 50:50 mol%) salts. The GC results reported that CH4 was the predominant hydrocarbon product with a lower CO2/H2O ratio (9.2) at 275 degrees C under 3 V in molten hydroxide (LiOH-NaOH). The results also showed that by increasing electrolysis temperature from 425 to 500 degrees C, the number of carbon atoms in hydrocarbon species rose to 7 (C7H16) with a production rate of 1.5 mu mol/h cm(2) at CO2/H2O ratio of 9.2. Moreover, the electrolysis to produce hydrocarbons in molten carbonates was more feasible at 1.5 V than 2 V due to the prospective carbon formation. While in molten hydroxide, the CH4 production rate (0.80-20.40 mu mol/h cm(2)) increased by increasing the applied voltage from 2.0-3.0 V despite the reduced current efficiencies (2.30 to 0.05%). The maximum current efficiency (99.5%) was achieved for H-2 as a by-product in molten hydroxide (LiOH-NaOH; 27:73 mol%) at 275 degrees C, under 2 V and CO2/H2O ratio of 1. Resultantly, the practice of molten salts could be a promising and encouraging technology for further fundamental investigation for hydrocarbon fuel formation due to its fast-electrolytic conversion rate and no utilization of catalyst.