Elucidating the Active-Phase Evolution of Fe-Based Catalysts during Isobutane Dehydrogenation with and without CO2 in Feed Gas

• DOI: 10.1021/acscatal.1c05907
• Publication Date: 2022-05-05T03:43:45Z
• Authors: Jiapei Wang; Min Liu; Junjie Li; Chuanfu Wang; Xinbao Zhang; Yingbin Zheng; Xiujie Li; Longya Xu; Xinwen Guo; Chunshan Song; Xiangxue Zhu
• Keywords: Isobutane; Butane

Fe-based catalysts are promising as inexpensive and nontoxic dehydrogenation catalysts, but the active phase has not been elucidated in CO2-assisted dehydrogenation. In this study, evolution of supported iron catalyst was studied with situ XRD, ex XPS, TEM, TG-DTA, experiments reaction atmosphere switching. The results show that original Fe2O3 is gradually reduced to α-Fe then carburized Fe3C a low CO2/i-C4H10 ratio feed atmosphere. serves an for i-C4H10 When CO2 introduced, also shows high activity reforming cracking, leading higher conversion, lower butene selectivity, larger amount coke deposition. With increasing ratio, species would stay at valence state longer time. Fe3O4 maintained throughout reactions 1/2 or higher, which relatively stable isobutane conversion. This work correlates active-phase catalytic performance provides fundamental insight into butane