Kinetic characteristics and redox performance of iron-based oxygen carriers blending with iron-rich sludge ash

Yuan Xiaoying; Wang Xiaoran; Zheng Zhihao; Wang Cuiping

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Kinetic characteristics and redox performance of iron-based oxygen carriers blending with iron-rich sludge ash

Updated：2026-08-24

- Kinetic characteristics and redox performance of iron-based oxygen carriers blending with iron-rich sludge ash
- Chinese Journal of Chemical Engineering Vol. 94, Issue 6, Pages: 223-231(2026)
- Affiliations：
  
  Clean Energy Laboratory, Shandong University of Science and Technology, Qingdao 266590, China
  Qingdao Yunlu Advanced Material Technology Co. Ltd., Qingdao 266200, China
- Author bio：
  
  Corresponding authors. E-mail addresses: zhengzhihao@sdust.edu.cn(Z. Zheng)
  wangcuiping21@sdust.edu.cn(C. Wang)
- Funds：
- DOI：
  CLC：
- Received：28 July 2025，
  
  Revised：2025-12-30，
  
  Accepted：03 January 2026，
  
  Online First：06 February 2026，
  
  Published：2026-06
- Accepted：
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Yuan Xiaoying, Wang Xiaoran, Zheng Zhihao, et al. Kinetic characteristics and redox performance of iron-based oxygen carriers blending with iron-rich sludge ash[J]. Chinese Journal of Chemical Engineering, 2026, 94(6): 223-231.
DOI：

Yuan Xiaoying, Wang Xiaoran, Zheng Zhihao, et al. Kinetic characteristics and redox performance of iron-based oxygen carriers blending with iron-rich sludge ash[J]. Chinese Journal of Chemical Engineering, 2026, 94(6): 223-231. DOI：

摘要

Abstract

To investigate the redox performance and kinetic characteristics of iron-based oxygen carriers when mixed with iron-rich sludge ash during the sludge chemical looping gasification or combustion

the impregnation method was used to prepare Fe/Al composite oxygen carriers (Fe/Al-OC)

and the iron-rich sludge ash (IRSA) was produced by high-moisture sludge burning in Muffle stove. The two types powder were then mixed in a 1:1 mass ratio to obtain another OC of Fe1Ash1. Using a the

rmogravimetric analyzer

the deep redox processes of the three oxygen carriers were carried out

and their reduction under variable temperature or constant temperature and oxidation processes were analyzed using 13 kinetic models to investigate their kinetic parameters. The results showed that the blending of Fe/Al-OC and IRSA exhibited a synergistic effect

in which the actual oxygen release and oxygen gain amount of Fe1Ash1 both exceed the theoretical values

indicating enhanced oxygen transport capacity. During the reduction process

under non-isothermal conditions

the oxygen release in Fe/Al-OC was controlled by two-dimensional diffusion

while the oxygen release in IRSA and Fe1Ash1 followed a first-order reaction model

with Fe1Ash1 having a slightly lower activation energy (34.81 kJ·mol

- 1

) than the individual OCs. During isothermal reduction

the reaction of Fe/Al-OC transitions to contraction model control as temperature increases

IRSA maintains first-order reaction characteristics

while Fe1Ash1 reaction is more compatible with the F3/2 model

with synergistic effects weakening. During the oxidation process

Fe/Al-OC follows a first-order reaction model

while IRSA and Fe1Ash1 both follow two-dimensional diffusion models

but the activation energy of Fe1Ash1 (34.60 kJ·mol

- 1

) is significantly lower than that of the other two

resulting in superior oxidation performance. Thus the Fe/Al OC might achieve complementary performance and kinetic characteristics in redox with more sludge ash blending. The highest ash blending proportion that can promote oxygen carrying capacity would be studied in next works.

关键词

Keywords

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