Cobalt Nitride Carbon Dioxide "Changes Waste into Poor"
Professor Zeng Jie’s group at the China University of Science and Technology has made important progress in the study of active phases of cobalt-based catalysts in the hydrogenation of carbon dioxide. They introduced a nitrogen atom into the cobalt catalyst to build a cobalt nitride catalyst. Through in-situ mechanism studies, it was found that cobalt, nitrogen, and hydrogen are the true active phases in the catalytic process, which greatly improves the catalytic efficiency. The research results have recently been published online in the journal Nature-Energy.
Developing renewable energy sources and improving energy efficiency are major issues in the world today. Hydrogenation of carbon dioxide is an important reaction in low-carbon chemistry. On the one hand, chemical raw materials can be synthesized, carbon dioxide emission pressure can be relieved, and carbon energy can be recycled. On the other hand, methanol can be synthesized to realize the storage and utilization of hydrogen resources.
Due to the chemical inertness of carbon dioxide, the carbon dioxide hydrogenation reaction needs to be realized under high temperature and high pressure conditions, and there is a problem of excessive energy consumption in the conversion process. In the past few decades, a series of different strategies have been developed to increase the activity of non-precious metal catalysts for the hydrogenation of carbon dioxide. However, so far, the research on the active phase of non-precious metal catalysts in the hydrogenation of carbon dioxide is still in its infancy.
Zeng Jie's group introduced nitrogen atoms into cobalt catalysts to form cobalt nitride catalysts. In the catalytic hydrogenation of carbon dioxide, the cobalt nitride catalyst has a conversion frequency of 64 times that of the cobalt catalyst under the same conditions at 32 atmospheres and 150 degrees Celsius. Further research shows that under the atmosphere of hydrogen, the nitrogen atoms on the cobalt nitride catalyst will adsorb hydrogen atoms to form cobalt nitrogen and hydrogen as a special kind of phase. The amino hydrogen atom in cobalt nitrogen and hydrogen is directly added to the carbon dioxide molecule to form a formate species as an intermediate product, thereby greatly increasing the activity of carbon dioxide hydrogenation reaction.
The study provides a simple and effective way to optimize the activity of non-precious metal catalysts for hydrogenation of carbon dioxide, providing new ideas for finding cheaper and more efficient catalysts for carbon dioxide hydrogenation in the future, and has positive significance for solving energy and environmental problems. (Reporter Wu Changfeng)
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