Chemical looping combustion (CLC) can achieve the benefits of efficient conversion of hydrocarbon fuels and zero-energy CO₂ capture using oxygen carriers (OCs) with facilitated oxygen transport properties. The current study details the use of Cu- and Ca-doped lanthanum nickel perovskite-type materials as the OC in CLC processes. By incorporation of lanthanum nickel oxide with copper and calcium, the oxygen storage capacity and average transport rate of La_1–yCa_yCu_xNi_1–xO₃ are up to 7.8 wt % and 0.82 wt % min^–1, respectively, during the methane CLC process at 400 °C, whereas undoped LaNiO₃ cannot react with methane at a low temperature. Simultaneously, substituted lanthanum nickel oxides can decrease the oxygen transport temperature by about 70 °C compared to undoped lanthanum nickel oxide. X-ray diffraction, Brunauer–Emmett–Teller, and scanning electron microscopy of the samples were characterized in terms of particle properties and morphology to unveil the rational reasons of the high oxygen transport at lower temperatures. The enhancement of the specific surface area and stable porous morphology in La_1–yCa_yCu_xNi_1–xO₃ can both facilitate the oxygen transport in CLC processes. Experiments were executed to investigate the reactivity of the redox materials on the standpoints of oxygen capacity, stability, and regenerability. Hydrogen and methane as the fuels are both considered in this study. La_1–yCa_yCu_xNi_1–xO₃ showed favorable reactivity and stability in the successive redox cycles at low temperatures. These experimental results indicate that La_1–yCa_yCu_xNi_1–xO₃ can facilitate O^2– transport and have the potential to be used as the promising OC for low-temperature CLC processes.

中文翻译：

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镧镍钙钛矿型氧气载体上具有便利的O ²传输的化学循环燃烧

化学循环燃烧（CLC）可以实现碳氢化合物燃料高效转化和零氧CO ₂捕集的优势，而这种方法使用的是具有便利的氧传输特性的氧载体（OC）。当前的研究详细介绍了在CLC工艺中使用Cu和Ca掺杂的镧镍钙钛矿型材料作为OC。通过将镧镧镍氧化物与铜和钙结合，La _{1– y} Ca _y Cu _x Ni _{1– x} O _3的储氧能力和平均传输速率分别高达7.8 wt％和0.82 wt％min ^–1，在400°C的甲烷CLC过程中，而未掺杂的LaNiO ₃不能在低温下与甲烷反应。同时，与未掺杂的镧镍氧化物相比，取代的镧镍氧化物可使氧气的输送温度降低约70°C。通过样品的X射线衍射，Brunauer-Emmett-Teller和扫描电子显微镜对颗粒的性质和形态进行了表征，揭示了在较低温度下高氧传输的合理原因。La _{1 – y} Ca _y Cu _x Ni _{1– x} O _3中比表面积的增加和稳定的多孔形态都可以促进CLC过程中的氧气传输。从氧气容量，稳定性和可再生性的角度进行了实验以研究氧化还原材料的反应性。这项研究均考虑了以氢气和甲烷为燃料。La _{1 – y} Ca _y Cu _x Ni _{1 – x} O ₃在低温下连续的氧化还原循环中显示出良好的反应性和稳定性。这些实验结果表明，La _{1 – y} Ca _y Cu _x Ni _{1– x} O ₃可以促进O ^2– 并有潜力用作低温CLC工艺的有前景的OC。