Research On Reducing Energy Consumption Of CO₂ Desorption By Solid Acid Catalyst

Carbon dioxide（CO₂）emissions have continued to rise in recent years due to the burning of fossil fuel leading the gradual aggravation of global climate and the greenhouse effect,which has aroused widespread concern in the international community.At this stage,carbon capture utilization and storage（CCUS）technology is an important way to control carbon emissions with broad application prospects.The ethanolamine absorption method represented by monoethanolamine（MEA）is the most mature technology to capture CO₂.However,the regeneration energy consumption of this process is too high to be industrially applied,which is reaching 3.6-4.0 GJ/t CO₂and accounting for about 60-70%of the energy consumption in the entire carbon capture process.In this paper,solid acid materials with abundant acid sites are used as catalysts to reduce the energy consumption by promoting the proton transfer in the CO₂ desorption reaction process.The research contents are as follows:（1）Catalytic activity screening experiments were carried out for eight metal oxides,and cerium was determined as the best active component.A rod-like cerium-based MOFs material with irregular mesoporous channel structure was prepared,and phosphotungstic acid（HPW）was introduced to increase acid sites,which was named CeM-HPW-15.（2）The experimental results show that compared with non-catalysis,CeM-HPW-15 can increase the desorption rate by 166%,increase the desorption amount by 38.1%,and reduce the desorption energy consumption by 29.4%.（3）Through XRD,TEM,XPS and other characterization tests,it is found that the polyacid sites on the surface of CeM-HPW-15 catalyst are the key to promoting CO₂desorption performance.Ce O₂ and HPW can synergistically promote the decomposition of carbamate.In addition,HPW helps to facilitate the transfer of protons during the desorption process and lower the reaction energy barrier,thereby achieving high-efficiency and low-energy desorption of CO₂.The research in this paper provides new ideas for reducing the energy consumption of amine solution regeneration and promoting the industrial application of CCUS technology.At the same time,it also provides an important technical reference for reducing pollutants adn carbon emissions,in order to to achieve green transformation in the energy and power industry.