First-Principles Investigation of CO Adsorption on h-Fe7C3 Catalyst

Jinzhe Fu,Hui Du,Deshuai Sun,Zhaojun Chen,Jian Zhang

doi:10.3390/cryst10080635

Abstract

h-Fe7C3 is considered as the main active phase of medium-temperature Fe-based Fischer–Tropsch catalysts. Basic theoretical guidance for the design and preparation of Fe-based Fischer–Tropsch catalysts can be obtained by studying the adsorption and activation behavior of CO on h-Fe7C3. In this paper, the first-principles method based on density functional theory is used to study the crystal structure properties of h-Fe7C3 and the adsorption and activation CO on its low Miller index surfaces ( 1 1 ¯ 0 ) , ( 1 1 ¯ 1 ) , ( 101 ) , ( 1 1 ¯ 1 ¯ ) and ( 001 ) . It was found that the low Miller index crystal plane of h-Fe7C3 crystal has multiple equivalent crystal planes and that the maximum adsorption energy of CO at the 3F2 point of the ( 1 1 ¯ 1 ) plane is −2.50 eV, indicating that h-Fe7C3 has a better CO adsorption performance. In addition, the defects generated at the truncated position of the h-Fe7C3 crystal plane have a great impact on the adsorption energy of CO on its surface, that is, the adsorption energy of CO on Fe atoms with C vacancies is higher. The activity of CO after adsorption is greatly affected by the adsorption configuration and less affected by the adsorption energy. The higher the coordination number of Fe atoms after adsorption, the higher the CO activity. At the same time, it was found that the bonding of O and Fe atoms is conducive to the activation of CO.

Highlights

IntroductionDue to the increasing demand for petroleum in human industrial production and life, the conversion of synthesis gas (CO + H2 ) into fuel and high-value organic chemicals through
Due to the increasing demand for petroleum in human industrial production and life, the conversion of synthesis gas (CO + H2 ) into fuel and high-value organic chemicals throughFischer–Tropsch synthesis has been receiving increasing attention [1,2,3]
Owing to their high activity, high selectivity and low cost and the flexible distribution of low H2 /CO synthesis gas conversion products, iron-based catalysts are widely used in the Fischer–Tropsch synthesis industry [4]

Summary

Introduction

Due to the increasing demand for petroleum in human industrial production and life, the conversion of synthesis gas (CO + H2 ) into fuel and high-value organic chemicals through. Fischer–Tropsch synthesis has been receiving increasing attention [1,2,3] Owing to their high activity, high selectivity and low cost and the flexible distribution of low H2 /CO synthesis gas conversion products, iron-based catalysts are widely used in the Fischer–Tropsch synthesis industry [4]. The phase types of Fe-based catalysts during Fischer–Tropsch synthesis are very complicated, and the understanding of their catalytic mechanism is not clear. The active phase structure type and catalytic mechanism of iron-based catalysts need to be further studied to provide theoretical guidance for the design and preparation of new and efficient Fischer–Tropsch synthesis catalysts. In recent research, the catalytic activity of h-Fe7 C3 in medium-temperature

Methods

Results

Conclusion