Scientists Identify Transition Metal for Highly-efficient CO2 Activation
The atmospheric concentration of carbon dioxide (CO2) has risen significantly over the past century, which has imposed severe consequences for a global climate change and a planetary temperature increase. The capture and utilization of CO2 to create valuable chemicals is highly desired regarding as reducing CO2 from the atmosphere and using CO2 as a feedstock for sustainable energy sources.
A research team led by Prof. JIANG Ling and Prof. FAN Hongjun from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences, in collaboration with Prof. ZHAO Zhi from Hebei University of Engineering, characterized a transition metal M[η2-(O,O)C] species for highly-efficient CO2 activation.
The result was published in The Journal of Physical Chemistry Letters on Dec. 28.
Spectroscopic Identification of Transition-Metal M[η2-(O,O)C] Species for Highly-Efficient CO2 Activation (Image by ZHENG Huijun)
Based on the recently-developed infrared photodissociation spectroscopy apparatus, the researchers synthesized and characterized an unprecedented transition metal M[η2-(O,O)C] motif with bidentate double oxygen metal-CO2 coordination in the [ZrO(CO2)n>=4]+ complexes.
The Zr[η2-(O,O)C] species yielded a CO2- radical ligand, showing a high efficiency in CO2 activation. The CO2- radical and non-linear character of these series of M[η2-(O,O)C] complexes might enable high reactivity in many important reactions such as C-C coupling, C-H activation.
There were two important prerequisites for certain metals to form this intriguing M[η2-(O,O)C] species. One was the metal center had high reduction capability and the other was the oxidation state of the metal center was lower than its highest one by 1.
Systematic analyses for the effects of different transition and main-group metals on the formation of M[η2-(O,O)C] complexes provided comprehensive insights into the microscopic mechanism of CO2 activation by a single metal center, offering design criteria for single-atom catalyst with isolated transition metal atoms dispersed on supports. Such advances might be integrated into the CO2-activation and -utilization technology.
This study highlights the pivotal roles played by the M[η2-(O,O)C] species in CO2 activation and also opens new avenues towards the development of related single-atom catalysts with isolated transition metal atoms dispersed on supports.
Dalian Institute of Chemical Physics, Chinese Academy of Sciences
457 Zhongshan Road, Dalian, 116023, China
Tel: 86-411-84374221
E-mail: wangyj@dicp.ac.cn
