Application of MnFeO3 and MnFe2O4 as oxygen carriers for straw chemical looping gasification

CHEN Zhihao; LIAO Yanfen; MO Fei; LIU Guicai; YU Zhaosheng; MA Xiaoqian

doi:10.11949/0438-1157.20190798

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Application of MnFeO₃ and MnFe₂O₄ as oxygen carriers for straw chemical looping gasification

Energy and environmental engineering | 更新时间：2026-07-24

- Application of MnFeO₃ and MnFe₂O₄ as oxygen carriers for straw chemical looping gasification
- CIESC Journal Vol. 70, Issue 12, Pages: 4835-4846(2019)
- 作者机构：
  
  华南理工大学电力学院，广东广州 510640
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190798
  CLC： TK 6
- Received：11 July 2019，
  
  Revised：2019-08-15，
  
  Online First：09 June 2020，
  
  Published：05 December 2019
- 稿件说明：
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陈智豪, 廖艳芬, 莫菲, 刘桂才, 余昭胜, 马晓茜. MnFeO₃和MnFe₂O₄氧载体在稻草化学链气化中的应用[J]. 化工学报, 2019, 70(12): 4835-4846 DOI: 10.11949/0438-1157.20190798.

CHEN Zhihao, LIAO Yanfen, MO Fei, LIU Guicai, YU Zhaosheng, MA Xiaoqian. Application of MnFeO₃ and MnFe₂O₄ as oxygen carriers for straw chemical looping gasification[J]. CIESC Journal, 2019, 70(12): 4835-4846 DOI: 10.11949/0438-1157.20190798.
陈智豪, 廖艳芬, 莫菲, 刘桂才, 余昭胜, 马晓茜. MnFeO₃和MnFe₂O₄氧载体在稻草化学链气化中的应用[J]. 化工学报, 2019, 70(12): 4835-4846 DOI: 10.11949/0438-1157.20190798. DOI：

CHEN Zhihao, LIAO Yanfen, MO Fei, LIU Guicai, YU Zhaosheng, MA Xiaoqian. Application of MnFeO₃ and MnFe₂O₄ as oxygen carriers for straw chemical looping gasification[J]. CIESC Journal, 2019, 70(12): 4835-4846 DOI: 10.11949/0438-1157.20190798. DOI：

摘要

通过溶胶凝胶燃烧法合成了MnFeO

和MnFe

两种锰铁复合氧载体。通过原位红外实验探究其与稻草的化学链气化过程，发现其加速了稻草热解产物的析出，并通过气化反应促进CO和CO

的产生，提高了碳转化率。固定床实验结果表明MnFeO

和MnFe

在与水蒸气耦合气化的条件下大幅提高了合成气中H

和CO的产率，气化效率分别达到94.49%和92.76%。并通过XRD分析，发现MnFeO

和MnFe

在气化过程主要还原为(Fe

Mn)O，且在氧化反应后能回到初始晶相。在固定床的10次循环实验以及SEM的结果表明，MnFeO

在循环反应中逐渐形成的颗粒状多孔结构有利于维持稳定的气化效率，而MnFe

由于团聚和烧结作用形成了块状结构，气化效率呈缓慢下降趋势。因此，认为MnFeO

在生物质化学链气化中具有更好的适用性。

Abstract

The reactivity of oxygen carriers is curial for biomass chemical looping gasification (CLG) process. Two kinds of manganese-iron composite oxygen carriers of MnFeO

and MnFe

were synthesized by sol-gel combustion method. Though the

in situ

infrared

CLG experiments with straw were carried out. It indicated that the ferromanganese composite oxides accelerated the release rate of pyrolysis products and enhanced the yield of CO and CO

which promoted the carbon conversion efficiency. Further tests in fix-bed were to prove the feasibility of MnFeO

and MnFe

and the influence by coupling with steam. It showed that components of H

and CO in syngas could be improved significantly by introducing steam and the gasification efficiency for MnFeO

and MnFe

was 94.49% and 92.76% individually. The XRD analysis demonstrated that MnFeO

and MnFe

transformed to a combination of (Fe

Mn)O during the reduction process and both of them exhibit recyclable crystalline phase variation. Moreover

multiple redox tests showed MnFe

exhibited a decreasing tendency of gasification efficiency because of agglomeration

its typical surface morphology changed from scattered particles to blocky structure. However

MnFeO

formed a granular porous structure which helped to maintain a stable reactivity. Thus

MnFeO

was considered to have better applicability in CLG process.

关键词

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references

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