Effect of additives on performance of ZnFe<sub>2</sub>O<sub>4</sub> oxygen carriers in chemical looping hydrogen generation reaction

SONG Weifeng; WU Jingli; SUN Deshuai; WANG Zhiqi; WU Jinhu

doi:10.19666/j.rlfd.202402015

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Effect of additives on performance of ZnFe₂O₄ oxygen carriers in chemical looping hydrogen generation reaction

Thermal Power Generation Vol. 53, Issue 5, Pages: 19-27(2024)

更新时间：2025-09-28

- Effect of additives on performance of ZnFe₂O₄ oxygen carriers in chemical looping hydrogen generation reaction
- 作者机构：
  
  1. 青岛大学化学化工学院
  2. 中国科学院青岛生物能源与过程研究所
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202402015
  CLC： TQ116.2
- Published：2024
- 稿件说明：
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SONG Weifeng, WU Jingli, SUN Deshuai, et al. Effect of additives on performance of ZnFe₂O₄ oxygen carriers in chemical looping hydrogen generation reaction[J]. Thermal Power Generation, 2024, 53(5): 19-27.
DOI：

SONG Weifeng, WU Jingli, SUN Deshuai, et al. Effect of additives on performance of ZnFe₂O₄ oxygen carriers in chemical looping hydrogen generation reaction[J]. Thermal Power Generation, 2024, 53(5): 19-27. DOI： 10.19666/j.rlfd.202402015.

摘要

采用溶胶-凝胶法制备不同助剂掺杂改性的ZnFe_2O_4氧载体，探究不同助剂（Sr、Ce、La和Al）对其性能的影响。化学链制氢实验在固定床反应器中进行，结果表明：添加助剂能有效提高氧载体的性能，单位质量氧载体H_2产量从高到低依次为LaSrAlCe

La改性的ZnFe_2O_4氧载体反应活性最高。结合X射线衍射、H_2-程序升温还原、吸附比表面测试法等表征手段和化学链制氢实验对掺杂助剂La的氧载体物理化学性质作进一步分析，考察不同掺杂质量分数对氧载体反应性能的影响。结果表明：添加质量分数为12%La助剂的ZnFe_2O_4在化学链制氢反应中单位H_2产量最高；La助剂的加入提高了氧载体的比表面积，促进氧空位的形成，加快晶格氧的迁移速率，有利于化学链制氢反应。

Abstract

ZnFe_2O_4 oxygen carrier(OC) doped with different additives(Sr

La and Al) was prepared by sol-gel method to investigate the influence of different additives on performance of the ZnFe_2O_4 oxygen carrier.Chemical looping hydrogen generation(CLHG) experiments were carried out in a fixed bed reactor. It was found that the performance of ZnFe_2O_4 was greatly improved by doping different metals

and the hydrogen production of per unit mass OC from high to low is LaSrAlCe. The physicochemical properties of different amount of La-doped ZnFe_2O_4 were further analyzed by combining X-ray diffraction

H_2-temperature-programmed reduction

Brunauer-Em-mett-Teller method and other characterization methods. The data indicated that the Zn Fe2O4 modified by La with 12% mass fraction has the highest reaction activity. La dropping can increase the specific surface area of the OC

reduce the reduction temperature

increase the migration rate of lattice oxygen

promote the formation of oxygen vacancies

and is beneficial to the increase in hydrogen production in the chemical looping process.

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Effect of additives on performance of ZnFe2O4 oxygen carriers in chemical looping hydrogen generation reaction

DOI：10.19666/j.rlfd.202402015

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Effect of additives on performance of ZnFe₂O₄ oxygen carriers in chemical looping hydrogen generation reaction