Chemical looping oxidative propane dehydrogenation controlled by oxygen bulk diffusion over FeVO4 oxygen carrier pellets

被引:6
|
作者
Song, Hongbo [1 ]
Wang, Wei [1 ,2 ,5 ,6 ]
Sun, Jiachen [1 ,2 ]
Wang, Xianhui [1 ]
Zhang, Xianhua [1 ]
Chen, Sai [1 ]
Pei, Chunlei [1 ,2 ,3 ,4 ]
Zhao, Zhi-Jian [1 ,2 ,3 ,4 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, Key Lab Green Chem Technol, Minist Educ, Tianjin 300072, Peoples R China
[2] Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300072, Peoples R China
[3] Haihe Lab Sustainable Chem Transformat, Tianjin 300192, Peoples R China
[4] Tianjin Univ, Zhejiang Inst, Ningbo 315201, Zhejiang, Peoples R China
[5] Tianjin Univ, Joint Sch Natl Univ Singapore & Tianjin Univ, Int Campus, Fuzhou 350207, Peoples R China
[6] Natl Univ Singapore, Dept Chem, 3 Sci Dr 3, Singapore 117543, Singapore
来源
CHINESE JOURNAL OF CHEMICAL ENGINEERING | 2023年 / 53卷
基金
中国国家自然科学基金;
关键词
Chemical looping; Diffusion; Reaction kinetics; Oxygen carriers; Oxidation; METHANE PARTIAL OXIDATION; IRON-OXIDE; REDOX CATALYSTS; LATTICE OXYGEN; LIGHT ALKANES; KINETICS; COMBUSTION; REDUCTION; SELECTIVITY; REACTIVITY;
D O I
10.1016/j.cjche.2022.10.006
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The oxygen distribution and evolution within the oxygen carrier exert significant influence on chemical looping processes. This paper describes the influence of oxygen bulk diffusion within FeVO4 oxygen car-rier pellets on the chemical looping oxidative propane dehydrogenation (CL-ODH). During CL-ODH, the oxygen concentration at the pellet surface initially decreased and then maintained stable before the final decrease. At the stage with the stable surface oxygen concentration, the reaction showed a stable C3H6 formation rate and high C3H6 selectivity. Therefore, based on Fick's second law, the oxygen distribution and evolution in the oxygen carrier at this stage were further analyzed. It was found that main reactions of selective oxidation and over-oxidation were controlled by the oxygen bulk diffusion. C3H8 conversion rate kept decreasing during this stage due to the decrease of the oxygen flux caused by the decline of oxy-gen gradient within the oxygen carrier, while C3H6 selectivity increased due to the decrease of over -oxidation. In addition, reaction rates could increase with the propane partial pressure due to the increase of the oxygen gradient within the oxygen carrier until the bulk transfer reached its limit at higher pro-pane partial pressure. This study provides fundamental insights for the diffusion-controlled chemical looping reactions.(c) 2022 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.
引用
收藏
页码:409 / 420
页数:12
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