Nature: energy source of greenhouse gas incarnation

In recent years, the increasing global carbon dioxide emissions have posed a serious threat to the ecological environment on which people depend for survival Therefore, the capture, storage and transformation of carbon dioxide have important theoretical value and practical significance in solving the environmental and energy problems, and have been widely concerned by researchers A lot of Science and nature level work has emerged Whether electrochemical reduction or photochemical reduction, due to the chemical inertia of carbon dioxide itself, the catalytic efficiency is low Therefore, chemists have been looking for catalysts with higher activity The photocatalytic reduction of carbon dioxide (source: nature) is a kind of iron tetraphenylporphyrin complex (iron) with trimethylammonium group functionalization, which was discovered by the cooperation of researchers from Universit é Paris Diderot in France and Universidad Nacional de C ó rdoba in Argentina Tetraphenylpyrrin) catalyst can catalyze carbon dioxide to methane at room temperature, atmospheric pressure and visible light Methane detection (source: nature) when the reaction is carried out in acetonitrile solution and contains photosensitizer and sacrificial electron donor, the catalytic reaction can be stable for several days Considering that carbon monoxide is the main product of direct conversion of photoreductive carbon dioxide, researchers use two-step reduction method to first reduce carbon dioxide to carbon monoxide, and then reduce carbon monoxide to methane The total selectivity is 82%, and the quantum yield is 0.18% Possible catalytic mechanism (source: nature) However, the researchers think that this process is not efficient because the methane production speed is 12 g / h and the carbon monoxide content in the final product is very high The team said that people would prefer to get pure methane as a fuel, rather than a mixture of methane and carbon monoxide They are ready to carry out further spectral investigation and quantum calculation They hope that they will help to further discover the possible catalytic mechanism and help to develop the catalytic system with higher reaction rate and selectivity Thesis link: http://www.nature.com/nature/journal/vaop/ncurrent/full/nature23016 HTML? Foxtrotcallback = true