Wang Lei, Ma Tianzeng, Dai Shaomeng, Ren Ting, Chang Zheshao, Fu Mingkai, Li Xin, Li Yong
Institute of Electrical Engineering, Chinese Academy of Sciences Beijing 100190 China
University of Chinese Academy of Sciences Beijing 100190 China.
RSC Adv. 2020 Sep 29;10(59):35740-35752. doi: 10.1039/d0ra05709f. eCollection 2020 Sep 28.
The research of thermochemical CO splitting based on perovskites is a promising approach to green energy development. Performance evaluation was performed towards the doped perovskite LaCoZrO (LCZ-73) based two-step thermochemical CO splitting process thermodynamically based on the experimentally derived parameters for the first time. The impacts of vacuum pump and inert gas purge to reduce oxygen partial pressure and CO heating on the performance parameter have been analyzed. The results showed that at the of 10 bar, non-stoichiometric oxygen increased by more than 3 times as the reduction temperature varied from 1000 °C to 1300 °C, however, no significant deviation of was observed between 1300 °C and 1400 °C. The reaction enthalpy ranged from 60 to 130 kJ mol corresponding to = 0.05-0.40. Comparing the abovementioned two ways to reduce the oxygen partial pressure, the of 0.39% and 0.1% can be achieved with 75% and without heat recovery with the CO flow rate of 40 sccm under experimental conditions, respectively. The energy cost for CO heating during the thermodynamic process as the / increases was obtained from the perspective of energy analysis. The ratio of / at lower temperature required more demanding conditions for the aim of commercialization. Finally, the ability of perovskite to split CO and thermochemical performance were tested under different CO flow rates. The results showed that high CO flow rate was conducive to the production of CO, but at the cost of low . The maximum solar-to-fuel efficiency of 1.36% was achieved experimentally at a CO flow rate of 10 sccm in the oxidation step and 75% heat recovery.
基于钙钛矿的热化学CO分解研究是绿色能源发展的一种有前景的方法。首次基于实验得出的参数，对基于掺杂钙钛矿LaCoZrO（LCZ - 73）的两步热化学CO分解过程进行了热力学性能评估。分析了真空泵和惰性气体吹扫以降低氧分压以及CO加热对性能参数的影响。结果表明，在10 bar的压力下，当还原温度从1000℃变化到1300℃时，非化学计量氧增加了3倍多，然而，在1300℃和1400℃之间未观察到明显偏差。反应焓在60至130 kJ/mol范围内，对应于 = 0.05 - 0.40。比较上述两种降低氧分压的方法，在实验条件下，CO流速为40 sccm时，分别通过75%的热回收和无热回收可实现0.39%和0.1%的 。从能量分析的角度获得了热力学过程中CO加热的能量成本随 / 增加的情况。为了商业化，在较低温度下的 / 比值需要更苛刻的条件。最后，在不同CO流速下测试了钙钛矿分解CO的能力和热化学性能。结果表明，高CO流速有利于CO的产生，但代价是低 。在氧化步骤中CO流速为10 sccm且热回收75%的情况下，实验实现了1.36%的最大太阳能到燃料效率。
