Chemical looping oxidative propane dehydrogenation controlled by oxygen bulk diffusion over FeVO_(4)oxygen carrier pellets  

作　　者：Hongbo Song Wei Wang Jiachen Sun Xianhui Wang Xianhua Zhang Sai Chen Chunlei Pei Zhi-Jian Zhao 

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China [2]Collaborative Innovation Center of Chemical Science and Engineering,Tianjin 300072,China [3]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,China [4]Zhejiang Institute of Tianjin University,Ningbo 315201,China [5]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Binhai New City,Fuzhou 350207,China [6]Department of Chemistry,National University of Singapore,3 Science Drive 3117543,Singapore

出　　处：《Chinese Journal of Chemical Engineering》2023年第1期409-420,共12页中国化学工程学报（英文版）

基　　金：the National Key Research and Development Program of China (2021YFA1501302);the National Natural Science Foundation of China (22122808, U20B6002);the Haihe Laboratory of Sustainable Chemical Transformations and the Program of Introducing Talents of Discipline to Universities (BP0618007) for financial support;supported by the XPLORER PRIZE by Tencent Foundation

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 carrier 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 oxygen gradient within the oxygen carrier,while C3H6 selectivity increased due to the decrease of overoxidation.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 propane partial pressure.This study provides fundamental insights for the diffusion-controlled chemical looping reactions.

关 键 词：Chemical looping DIFFUSION Reaction kinetics Oxygen carriers OXIDATION 

分 类 号：TQ221.212[化学工程—有机化工]