Regulation of oxidation state of LaMn0.8Al0.2O3+δ/LaMn0.7Co0.3O3+δ oxygen carriers for chemical looping steam methane reforming

IF 6.7 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-04-26 DOI:10.1016/j.fuel.2025.135479

Xianglei Yin , Yongying Sang , Shen Wang , Laihong Shen

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Abstract

Chemical looping steam methane reforming (CLSMR) is a novel route to produce high-quality syngas (H₂/CO = 2) and pure hydrogen without gas separation and purification. However, two side reactions of methane complete oxidation and carbon deposition in addition to partial oxidation of methane restrict the CLSMR performance. This work modifies the surface of LaMn_0.7Co_0.3O_3+δ nanoparticles with a small amount of LaMn_0.8Al_0.2O_3+δ. Redox tests and characterization analyses suggested that the addition of LaMn_0.8Al_0.2O_3+δ regulates the oxidation state of LaMn_0.7Co_0.3O_3+δ oxygen carrier, declining cations valence state and increasing oxygen vacancies. The lower-valence cations weaken methane complete oxidation in virtue of the decreased non-selective oxygen. More oxygen vacancies promote the migration and release of selective oxygen to inhibit carbon deposition, and methane partial oxidation is also enhanced. This study provides a meaningful guidance for an all-around performance boost of oxygen carriers for chemical looping conversion of carbonaceous fuels.

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化学环蒸汽甲烷重整中LaMn0.8Al0.2O3+δ/LaMn0.7Co0.3O3+δ氧载体氧化态的调控

化学循环蒸汽甲烷重整（CLSMR）是一种无需气体分离提纯就能生产高质量合成气（H2/CO = 2）和纯氢气的新途径。然而，除甲烷部分氧化外，甲烷完全氧化和积碳两种副反应限制了CLSMR的性能。本工作用少量LaMn0.8Al0.2O3+δ修饰LaMn0.7Co0.3O3+δ纳米颗粒的表面。氧化还原实验和表征分析表明，LaMn0.8Al0.2O3+δ的加入调节了LaMn0.7Co0.3O3+δ氧载体的氧化态，降低了阳离子价态，增加了氧空位。由于非选择性氧的减少，低价阳离子减弱了甲烷的完全氧化。更多的氧空位促进了选择性氧的迁移和释放，抑制了碳沉积，甲烷的部分氧化也增强了。该研究为全面提高含碳燃料化学环转化氧载体的性能提供了有意义的指导。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.