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$Sr_{1-x}K_{x}FeO_{3}$ Perovskite Catalysts with Enhanced RWGS Reactivity for $CO_{2}$ Hydrogenation to Light Olefins
| Content Provider | MDPI |
|---|---|
| Author | Hou, Yuanhao Wang, Xinyu Chen, Ming Gao, Xiangyu Liu, Yongzhuo Guo, Qingjie |
| Copyright Year | 2022 |
| Description | The catalytic hydrogenation of $CO_{2}$ to light olefins $(C_{2}–C_{4}$) is among the most practical approaches to $CO_{2}$ utilization as an essential industrial feedstock. To achieve a highly dispersed active site and enhance the reactivity of the reverse water–gas shift (RWGS) reaction, $ABO_{3}$-type perovskite catalysts $Sr_{1-x}K_{x}FeO_{3}$ with favorable thermal stability and redox activity are reported in this work. The role of K-substitution in the structure–performance relationship of the catalysts was investigated. It indicated that K-substitution expedited the oxygen-releasing process of the $SrFeO_{3}$ and facilitated the synchronous formation of active-phase $Fe_{3}O_{4}$ for the reverse water–gas shift (RWGS) reaction and $Fe_{5}C_{2}$ for the Fischer–Tropsch synthesis (FTS). At the optimal substitution amount, the conversion of $CO_{2}$ and the selectivity of light olefins achieved 30.82% and 29.61%, respectively. Moreover, the selectivity of CO was up to 45.57% even when $H_{2}/CO_{2}$=4 due to $CO_{2}$-splitting reactions over the reduced $Sr_{2}Fe_{2}O_{5}$. In addition, the reversibility of perovskite catalysts ensured the high dispersion of the active-phase $Fe_{3}O_{4}$ and $Fe_{5}C_{2}$ in the $SrCO_{3}$ phase. As the rate-determining step of the $CO_{2}$ hydrogenation reaction to light olefins over $Sr_{1-x}K_{x}FeO_{3}$ perovskite catalysts, FTS should be further tailored by partial substitution of the B site. In sum, the perovskite-derived catalyst investigated in this work provided a new idea for the rational design of a catalyst for $CO_{2}$ hydrogenation to produce light olefins. |
| Starting Page | 760 |
| e-ISSN | 20734433 |
| DOI | 10.3390/atmos13050760 |
| Journal | Atmosphere |
| Issue Number | 5 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-05-08 |
| Access Restriction | Open |
| Subject Keyword | Atmosphere Applied Chemistry Olefins Carbon Dioxide Hydrogenation Perovskite-type Oxides K-substituting |
| Content Type | Text |
| Resource Type | Article |
