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Dopant-Induced Tailoring of Isothermal Redox Properties of CaMnO3 Perovskites
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2020-10-15 , DOI: 10.1021/acs.iecr.0c03449 Mahesh M. Nair 1 , Ningyu Yu 1 , Nader Mahinpey 1
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2020-10-15 , DOI: 10.1021/acs.iecr.0c03449 Mahesh M. Nair 1 , Ningyu Yu 1 , Nader Mahinpey 1
Affiliation
In the present manuscript, we address the effects of B-site substitution (Fe and Co) on the redox performance of CaMnO3, under the conditions of chemical looping combustion (CLC). The variations in composition and redox chemistry were found to be influenced by both the nature and the amount of the B-site components and the temperature of operation. The low-temperature (600 °C) performance was found to be enhanced by replacing Mn with 5% of Fe or Co, independently. At 750 °C, all of the materials were found to exhibit performance loss during the first few cycles. Even though these materials exhibited stable reduction and re-oxidation extents afterward, complete destruction of the perovskite structure was observed after 15 cycles. At 900 °C, the long-term redox performance variations were found to not depend on the presence of impurity phases and surface structure, indicating that the oxidation state of the cations and temperature were playing a more decisive role in determining the redox chemistry of these materials. All of the materials used in this study were found to selectively suppress the undesirable CH4 splitting reaction and the resultant carbon deposition, which may be attributed to the basicity of Ca.
中文翻译:
掺杂剂诱导的CaMnO 3钙钛矿等温氧化还原特性的剪裁
在本文中,我们探讨了B位取代(Fe和Co)对CaMnO 3氧化还原性能的影响,在化学循环燃烧(CLC)的条件下。发现组成和氧化还原化学的变化受B位组分的性质和数量以及操作温度的影响。发现通过用5%的Fe或Co替代Mn可以增强低温(600°C)性能。在750°C下,发现所有材料在前几个循环中都表现出性能损失。即使这些材料随后显示出稳定的还原和再氧化程度,在15个循环后仍观察到钙钛矿结构的完全破坏。在900°C下,发现长期的氧化还原性能变化不取决于杂质相和表面结构的存在,表明阳离子的氧化态和温度在决定这些材料的氧化还原化学方面起着决定性的作用。发现本研究中使用的所有材料均可选择性抑制不良CH4分裂反应和由此产生的碳沉积,这可能归因于Ca的碱度。
更新日期:2020-10-29
中文翻译:
掺杂剂诱导的CaMnO 3钙钛矿等温氧化还原特性的剪裁
在本文中,我们探讨了B位取代(Fe和Co)对CaMnO 3氧化还原性能的影响,在化学循环燃烧(CLC)的条件下。发现组成和氧化还原化学的变化受B位组分的性质和数量以及操作温度的影响。发现通过用5%的Fe或Co替代Mn可以增强低温(600°C)性能。在750°C下,发现所有材料在前几个循环中都表现出性能损失。即使这些材料随后显示出稳定的还原和再氧化程度,在15个循环后仍观察到钙钛矿结构的完全破坏。在900°C下,发现长期的氧化还原性能变化不取决于杂质相和表面结构的存在,表明阳离子的氧化态和温度在决定这些材料的氧化还原化学方面起着决定性的作用。发现本研究中使用的所有材料均可选择性抑制不良CH4分裂反应和由此产生的碳沉积,这可能归因于Ca的碱度。