Tracking C-H bond activation for propane dehydrogenation over transition metal catalysts: work function shines

Xin Chang; Zhenpu Lu; Xianhui Wang; Zhi-Jian Zhao; Jinlong Gong

doi:10.1039/d3sc01057k

Tracking C-H bond activation for propane dehydrogenation over transition metal catalysts: work function shines

Chem Sci. 2023 May 18;14(23):6414-6419. doi: 10.1039/d3sc01057k. eCollection 2023 Jun 14.

Authors

Xin Chang^{1

2}, Zhenpu Lu^{1

2}, Xianhui Wang^{1

2}, Zhi-Jian Zhao^{1

2

3}, Jinlong Gong^{1

2

3}

Affiliations

¹ Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University China zjzhao@tju.edu.cn jlgong@tju.edu.cn.
² Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 China.
³ Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University, Binhai New City Fuzhou 350207 China.

Abstract

The activation of the C-H bond in heterogeneous catalysis plays a privileged role in converting light alkanes into commodity chemicals with a higher value. In contrast to traditional trial-and-error approaches, developing predictive descriptors via theoretical calculations can accelerate the process of catalyst design. Using density functional theory (DFT) calculations, this work describes tracking C-H bond activation of propane over transition metal catalysts, which is highly dependent on the electronic environment of catalytic sites. Furthermore, we reveal that the occupancy of the antibonding state for metal-adsorbate interaction is the key factor in determining the ability to activate the C-H bond. Among 10 frequently used electronic features, the work function (W) exhibits a strong negative correlation with C-H activation energies. We demonstrate that e^-W can effectively quantify the ability of C-H bond activation, surpassing the predictive capacity of the d-band center. The C-H activation temperatures of the synthesized catalysts also confirm the effectiveness of this descriptor. Apart from propane, e^-W applies to other reactants like methane.