用于化学链燃烧应用的新型 La1−xCaxMnO3 钙钛矿材料,International Journal of Energy Research

当前位置： X-MOL 学术 › Int. J. Energy Res. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

用于化学链燃烧应用的新型 La1−xCaxMnO3 钙钛矿材料
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2022-04-28 , DOI: 10.1002/er.7999
Eleni F. Iliopoulou ₁ , Charitini Matsouka _{1,

2} , Eleni Pachatouridou ₁ , Flora Papadopoulou ₂ , Antonios Psarras ₁ , Antigoni Evdou ₁ , Vassilios Zaspalis _{1,

2} , Lori Nalbandian ₁

Affiliation

按照共沉淀法和改变 Ca 百分比（0、30、50、70、100 wt%），合成了新型定制的镧钙锰（LCM）钙钛矿结构作为化学链燃烧（CLC）的候选材料。它们提供氧气并因此氧化 CH _4的能力在燃料氧化阶段，和/或在固体氧化阶段可逆地接收氧气进行了探索，在实验室规模的固定床反应器中在 1000°C 下进行脉冲反应实验。他们还在一个更大的流化床反应器单元中进一步探索了它们在多个氧化还原循环中的稳定性，其中进一步研究了最佳氧载体材料 (OCM) 样品的稳定性（最多 100 个氧化还原循环）。所有材料在使用前后都进行了物理化学表征（N ₂吸附-脱附等温线的孔隙率特征，X射线衍射的结晶相鉴定，扫描电子显微镜的形态观察，H ₂ -TPR，TPD的氧化还原性质研究-O ₂, 和 TPO), 以努力追踪其质地和形态特征的任何变化, 由于 Ca 掺杂和多次还原-氧化循环。所有材料在氧转移能力 (OTC)、CH ₄氧化能力、对 CO ₂和 CO 的选择性以及在多个还原-氧化循环中的稳定性方面都表现出不同的效率，这种行为取决于 Ca 含量和衍生的物理化学性质。所合成的 LCM 样品的还原性和氧吸附能力随着 CaMnO _{3含量的增加而增强}（LCM100）呈现出最好的氧化还原特性，并被认为是研究过的钙钛矿中最有前途的 OCM，在 1000°C 时达到 7.73 wt% 的最大 OTC。在较低温度（720°C、820°C 和 920°C）下对 CaMnO ₃钙钛矿的进一步评估显示出巨大的氧化还原电位，而经过多次氧化还原循环后样品的海绵状形态和还原-氧化能力得以保留。

"点击查看英文标题和摘要"

Novel La1−xCaxMnO3 perovskite materials for chemical looping combustion applications

Novel customized lanthanum calcium manganese (LCM) perovskite structures were synthesized as candidate materials for chemical looping combustion (CLC) following the coprecipitation method and varying the Ca percentage (0, 30, 50, 70, 100 wt%). Their ability either to offer oxygen and thus oxidize CH₄ during the fuel oxidation stage, and/or to reversibly receive oxygen during the solid oxidation stage was explored performing pulse reaction experiments in a lab scale, fixed-bed reactor at 1000°C. Their stability in multiple redox cycles was also further explored in a larger, fluid-bed reactor unit, where the stability of the optimum oxygen carrier material (OCM) sample was further investigated (up to 100 redox cycles). All materials were physicochemically characterized before and after their use (porosity characteristics by N₂ adsorption-desorption isotherms, identification of crystalline phases by X-ray diffraction, morphological observation by scanning electron microscopy, investigation of the redox properties by H₂-TPR, TPD-O₂, and TPO), in an effort to track down any alterations in their textural and morphological characteristics, as a result of Ca doping and multiple reduction-oxidation cycles. All materials exhibited varying efficiency concerning their oxygen transfer capacity (OTC), their CH₄ oxidation ability, their selectivity to CO₂ and CO, and their stability in multiple reduction-oxidation cycles, a behavior depending on the Ca content and derived physicochemical properties. The reducibility and the oxygen adsorption capacity of the as synthesized LCM samples is enhanced with increasing Ca content with CaMnO₃ (LCM100) presenting the best redox properties and suggested as the most promising OCM among the studied perovskites, reaching a maximum OTC of 7.73 wt% at 1000°C. Further evaluation of the CaMnO₃ perovskite at lower temperatures (720°C, 820°C, and 920°C) showed great redox potential, while the spongy morphology and the reduction-oxidation ability of the sample was retained after multiple redox cycles.

更新日期：2022-04-28

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南