Carbon dioxide methanation
Thread Content
Which expert is familiar with carbon dioxide methanation, including the process flow, catalysts, process equipment, reaction temperature, etc.?
Carbon dioxide methanation refers to the reaction CO2 + 4H2 → CH4 + 2H2O + Q under the action of a nickel-based catalyst
It’s the same as carbon monoxide methylation, but it probably won’t be used very often.
Carbon dioxide methanation refers to the reaction CO2 + 4H2 → CH4 + 2H2O – 165 kJ/mol, which occurs under the action of a catalyst; it is a highly exothermic process. There are many types of catalysts, and nickel-based ones are one type. The purpose of my asking this question is to hope that experts will pay attention to the conversion of carbon dioxide emitted in industry into methane – a process that not only deals with greenhouse gases but also generates new energy.
CO2 methanation: where does the hydrogen come from? Gasification? Natural gas conversion? —— More CO2 emissions from water electrolysis? Solar water electrolysis? ——Large-scale industrialization is still too far off!
Reply to 4# blueseabreeze: The methanation rate of carbon dioxide is not high, and besides, where would the hydrogen come from? Industrial carbon dioxide can be turned into liquid CO2 for delivery!
The biggest waste in coal-to-gas projects is the large amount of carbon dioxide generated. The current popular technique is the underground storage of carbon dioxide; it seems that Shenhua’s coal-to-oil project has already implemented this method. Another application is in oil extraction, where it is used to increase oil recovery rates.
Reply to 8# lflsedin: Using carbon dioxide for oil extraction is a good method at present; however, the carbon dioxide used in oil extraction does not disappear completely – it comes back to the surface as well, only with an increased rate. I propose this idea in order to use carbon dioxide to generate new energy. Hydrogen research institutes in Germany, carbon science companies in the United States, and several companies in Japan are all conducting research, and there are demonstration projects as well. It’s by no means a false proposition; it’s just that energy consumption is an issue that requires long-term attention and urgent resolution.
The most important thing is how to solve the issue of the hydrogen source; if it’s possible to produce large amounts of hydrogen without generating CO2, then all other problems become easier to address. The conversion rate of CO2 methanation is not good, but it can first be converted to CO and then methaneated. Otherwise, all the efforts made will still result in the production of large amounts of CO2. No one knows what the consequences will be of current methods for reducing CO2 emissions, such as landfilling and oil displacement.
Reply to 9# liaohu: The issue with hydrogen has been resolved in our company; there is definitely a source for it.
Reply to 7# lflsedin: It always feels like carbon dioxide is being used in oil fields; it’s as if we’re inflating the Earth, and there’s always a fear that it might leak