Citation: ZHANG Dian-Yu, LIU Fang, DU Peng-Fei, LI Meng-Wei, WU Zhao-Xuan, FENG Yi-Bing, ZHAO Yang, XU Xiao-Yan, ZHANG Xin-Xing, LU Jun-Ling, YANG Bing. Dynamic Formation of Pd^δ+-Fe²⁺ Interface Promoting Reverse Water Gas Shift Reaction over Pd/FeO_x Catalyst[J]. Chinese Journal of Inorganic Chemistry, ;2021, 37(1): 140-150. doi: 10.11862/CJIC.2021.002 shu

Dynamic Formation of Pd^δ+-Fe²⁺ Interface Promoting Reverse Water Gas Shift Reaction over Pd/FeO_x Catalyst

ZHANG Dian-Yu ^1,2 ,
LIU Fang ³ ,
DU Peng-Fei ^1,2 ,
LI Meng-Wei ¹ ,
WU Zhao-Xuan ⁴ ,
FENG Yi-Bing ¹ ,
ZHAO Yang ¹ ,
XU Xiao-Yan ¹ ,
ZHANG Xin-Xing ⁵ ,
LU Jun-Ling ³ ,
YANG Bing ^1,,

1.
Dalian National Laboratory for Clean Energy(DNL), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
4.
Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
5.
Department of Chemistry, the University of Chicago, Chicago, IL 60637, United States

Corresponding author: YANG Bing, byang@dicp.ac.cn
Received Date: 29 June 2020
Revised Date: 21 October 2020

Figures(5)

We systematically investigated Pd/FeO_x for the reverse water gas shift (RWGS) reaction using a combination of ex situ and in situ characterizations, including transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, temperature-programmed desorption/reduction/oxidation (TPD/TPR/TPO), and X-ray photoelectron spectroscopy (XPS). A highly dispersed Pd/FeO_x catalyst was synthesized using Pd(acac)₂ as the precursor. The catalyst exhibited high activity, with CO₂ conversion of ~29% and CO selectivity ogreater than 98% at 400℃, which are among the highest values in the literature. Moreover, Pd/SiO₂ and Pd-Fe/SiO₂ were further studied to determine the significant role of the Pd-FeO_x interface in promoting the RWGS reaction. Semi-in situ XPS revealed the dynamic formation of Pd^δ+-Fe²⁺ species at the Pd-FeO_x interface; the species acted as highly active sites for CO₂ dissociation. Our results also showed the formation of the Pd^δ+-Fe²⁺ interface during the RWGS reaction remarkably enhanced the activity and selectivity of the Pd-FeO_x catalyst for the reaction, benefiting CO₂ adsorption, C=O dissociation, and CO desorption.
- palladium,
- carbon dioxide,
- interfaces,
- reaction mechanisms,
- heterogeneous catalysis
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沈阳化工大学材料科学与工程学院沈阳 110142

Dynamic Formation of Pdδ+-Fe2+ Interface Promoting Reverse Water Gas Shift Reaction over Pd/FeOx Catalyst

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通讯作者: 陈斌, bchen63@163.com

Dynamic Formation of Pd^δ+-Fe²⁺ Interface Promoting Reverse Water Gas Shift Reaction over Pd/FeO_x Catalyst