Effect of supports on the redox performance of pyrite cinder in chemical looping combustion

doi:10.1016/j.cjche.2020.11.034

Chinese Journal of Chemical Engineering ›› 2021, Vol. 37 ›› Issue (9): 168-174.DOI: 10.1016/j.cjche.2020.11.034

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Effect of supports on the redox performance of pyrite cinder in chemical looping combustion

Zhong Ma^1,2, Chuan Yuan¹, Shuai Zhang³, Yonggang Lu¹, Junhui Xiong¹

1. School of Energy & Power Engineering, Jiangsu University, Zhenjiang 212013, China;
2. State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;
3. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

Received:2020-08-02 Revised:2020-10-22 Online:2021-11-02 Published:2021-09-28
Contact: Zhong Ma
Supported by:
This work was supported by the Program for High-Level Entrepreneurial and Innovative Talents Introduction of Jiangsu Province, Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2021-K56), Foundation of Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education and Senior Talent Foundation of Jiangsu University (20JDG40).

Effect of supports on the redox performance of pyrite cinder in chemical looping combustion

Zhong Ma^1,2, Chuan Yuan¹, Shuai Zhang³, Yonggang Lu¹, Junhui Xiong¹

1. School of Energy & Power Engineering, Jiangsu University, Zhenjiang 212013, China;
2. State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;
3. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

通讯作者: Zhong Ma
基金资助:
This work was supported by the Program for High-Level Entrepreneurial and Innovative Talents Introduction of Jiangsu Province, Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2021-K56), Foundation of Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education and Senior Talent Foundation of Jiangsu University (20JDG40).

Abstract

Abstract: Chemical looping combustion (CLC) is a clean and efficient flame-free combustion technology, which combust the fuels by lattice oxygen from a solid oxygen carrier with inherent CO₂ capture. The development of oxygen carriers with low cost and high redox performance is crucial to the whole efficiency of CLC process. As the solid by-product from the sulfuric acid production, pyrite cinder presented excellent redox performance as an oxygen carrier in CLC process. The main components in pyrite cinder are Fe₂O₃, CaSO₄, Al₂O₃ and SiO₂ in which Fe₂O₃ is the active component to provide lattice oxygen. In order to systematic investigate the functions of supports (CaSO₄, Al₂O₃ and SiO₂) in pyrite cinder, three oxygen carriers (Fe₂O₃-CaSO₄, Fe₂O₃-Al₂O₃ and Fe₂O₃-SiO₂) were prepared and evaluated in this study. The results showed that Fe₂O₃-CaSO₄ displayed high redox activity and cycling stability in the multiple redox cycles. However, both Fe₂O₃-Al₂O₃ and Fe₂O₃-SiO₂ experienced serious deactivation during redox reactions. It indicated that the inert Fe-Si solid solution (Fe₂SiO₄) was formed in the spent Fe₂O₃-SiO₂ sample, which decreased the oxygen carrying capacity of this sample. The XPS results showed that the oxygen species on the surface of Fe₂O₃-CaSO₄ could be fully recovered after the 20 redox cycles. It can be concluded that CaSO₄ is the key to the high redox activity and cycling stability of pyrite cinder.

Key words: Chemical looping, Pyrite cinder, Supports, Fixed-bed, Redox performance, Waste treatment

摘要： Chemical looping combustion (CLC) is a clean and efficient flame-free combustion technology, which combust the fuels by lattice oxygen from a solid oxygen carrier with inherent CO₂ capture. The development of oxygen carriers with low cost and high redox performance is crucial to the whole efficiency of CLC process. As the solid by-product from the sulfuric acid production, pyrite cinder presented excellent redox performance as an oxygen carrier in CLC process. The main components in pyrite cinder are Fe₂O₃, CaSO₄, Al₂O₃ and SiO₂ in which Fe₂O₃ is the active component to provide lattice oxygen. In order to systematic investigate the functions of supports (CaSO₄, Al₂O₃ and SiO₂) in pyrite cinder, three oxygen carriers (Fe₂O₃-CaSO₄, Fe₂O₃-Al₂O₃ and Fe₂O₃-SiO₂) were prepared and evaluated in this study. The results showed that Fe₂O₃-CaSO₄ displayed high redox activity and cycling stability in the multiple redox cycles. However, both Fe₂O₃-Al₂O₃ and Fe₂O₃-SiO₂ experienced serious deactivation during redox reactions. It indicated that the inert Fe-Si solid solution (Fe₂SiO₄) was formed in the spent Fe₂O₃-SiO₂ sample, which decreased the oxygen carrying capacity of this sample. The XPS results showed that the oxygen species on the surface of Fe₂O₃-CaSO₄ could be fully recovered after the 20 redox cycles. It can be concluded that CaSO₄ is the key to the high redox activity and cycling stability of pyrite cinder.

关键词: Chemical looping, Pyrite cinder, Supports, Fixed-bed, Redox performance, Waste treatment

Zhong Ma, Chuan Yuan, Shuai Zhang, Yonggang Lu, Junhui Xiong. Effect of supports on the redox performance of pyrite cinder in chemical looping combustion[J]. Chinese Journal of Chemical Engineering, 2021, 37(9): 168-174.

Zhong Ma, Chuan Yuan, Shuai Zhang, Yonggang Lu, Junhui Xiong. Effect of supports on the redox performance of pyrite cinder in chemical looping combustion[J]. 中国化学工程学报, 2021, 37(9): 168-174.

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Effect of supports on the redox performance of pyrite cinder in chemical looping combustion

Effect of supports on the redox performance of pyrite cinder in chemical looping combustion

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