image: The build-up of carbon on catalysts used for the thermocatalytic conversion of CO2 reduces the efficiency of these processes and represents a barrier to their industrial application. The research team headed by Prof. Matteo Maestri discovered that carbon formation is closely related to the ratio of carbon dioxide (CO2) to methane (CH4) present during the Dry Reforming reaction. The image, published on the front cover of the prestigious scientific journal Angewandte Chemie, expresses this concept and depicts a hot-air balloon flying over dark mountains, a metaphor for carbon formation. The CO2 molecules, present in greater numbers than the methane molecules in the basket, are the balloon’s driving force. Without the thrust provided by the CO2, the methane would tend to sink downwards, towards the undesirable formation of carbon.
Credit: Politecnico di Milano
Milan, 22 October 2024 – Against the backdrop of the energy transition and the fight against climate change, a study conducted by Politecnico di Milano’s Department of Energy heralds in new ways of using greenhouse gases. Blazoned on the front cover of the prestigious scientific journal Angewandte Chemie, the research offers a new key to understanding how to improve the efficiency of processes that convert greenhouse gases into energy resources and reduce the impact of methane and CO2, two greenhouse gases responsible for global warming.
The research team headed by Prof. Matteo Maestri studied Dry Reforming, a chemical process that converts methane and carbon dioxide, two of the main greenhouse gases, into a synthesis gas that is used both in hydrogen production and in many sectors of the chemical and energy industries. Using supported metal nanoparticles as catalysts, the Dry Reforming process enables high conversions, accelerating the necessary chemical reactions.
However, one of the main obstacles to a more widespread application of this process is the build-up of carbon on the surface of the catalysts, a phenomenon that reduces their efficiency and makes them less suitable for large-scale use. Using operando Raman spectroscopy, an advanced technique that allows catalysts to be studied in real time during chemical reactions, the team discovered that the gradual formation of carbon is closely related to the ratio of carbon dioxide (CO2) to methane (CH4) present in the reaction.
“Our work allowed us to observe how a catalyst transforms during the reaction,’ explains Prof. Matteo Maestri from the Department of Energy at Politecnico di Milano “Knowing this will help us improve the efficiency of catalysts, with a potentially significant impact on the reduction of greenhouse gas emissions and long-term energy sustainability.”
The possibility of preventing or mitigating carbon build-up on catalysts paves the way for longer-lasting and more efficient technologies based on this reaction, offering new solutions for the use of CO2 biogas.
Journal
Angewandte Chemie
Method of Research
Experimental study
Subject of Research
Not applicable
Article Title
Surface Carbon Formation and its Impact on Methane Dry Reforming Kinetics on Rhodium-Based Catalysts by Operando Raman Spectroscopy
Article Publication Date
23-Aug-2024