DFT insight into the effect of potassium on the adsorption, activation and dissociation of CO2 over Fe-based catalysts

Physical Chemistry Chemical Physics : PCCP
Xiaowa NieChunshan Song

Abstract

Catalytic conversion of CO2 including hydrogenation has attracted great attention as a method for chemical fixation of CO2 in combination with other techniques such as CO2 capture and storage. Potassium is a well-known promotor for many industrial catalytic processes such as in Fischer-Tropsch synthesis. In this work, we performed density functional theory (DFT) calculations to investigate the effect of potassium on the adsorption, activation, and dissociation of CO2 over Fe(100), Fe5C2(510) and Fe3O4(111) surfaces. The function of K was analyzed in terms of electronic interactions between co-adsorbed CO2 and K-surfaces which showed conspicuous promotion in the presence of K of the adsorption and activation of CO2. The adsorption strength of CO2 on these surfaces ranks as oct2-Fe3O4(111) > Fe(100) > Fe5C2(510). Generally, we observed a direct proportional correlation between the adsorption strength and the charges on the adsorbates. Adding K on the catalyst surface also reduces the kinetic barrier for CO2 dissociation. CO2 dissociation is more facile to occur on Fe(100) and Fe5C2(510) in the presence of K whereas the Fe3O4(111) surfaces impede CO2 dissociation regardless of the existence of K. Instead, a stable CO3- species is ...Continue Reading

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Citations

Apr 11, 2019·Physical Chemistry Chemical Physics : PCCP·Irina V Chernyshova, Sathish Ponnurangam
Dec 15, 2019·Nature Communications·Run-Ping YeYuan-Gen Yao

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Methods Mentioned

BETA
scanning tunneling microscopy
transmission
X-ray

Software Mentioned

VESTA
Vienna Ab - initio Simulation Package ( VASP )

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