Carbon dioxide from exhaust fumes used to make new chemicals

● By Jessica Breen, University of Leeds ● To stop global warming, most governments are advocating reducing the amount of carbon dioxide (CO₂), a greenhouse gas, put into the atmosphere. But some argue that such action won’t be enough – we will need to remove CO₂ already present. The reduction of CO₂ is a big challenge, as it requires large amounts of renewable energy. Until then, short-term solutions to remove CO₂ from fossil fuel power plants is becoming necessary, including carbon capture and storage (CCS). The other option is to use the storage part, as new research from Korea shows, and to use CO₂ directly from exhaust gases to make new chemicals. Catch me if you can Carbon capture involves the “capture” of CO₂, either by a chemical or physical process. Often CO₂ from a exhaust gas stream is captured by nitrogen containing compounds called amines. The reaction results in the formation of solid chemicals. These can be heated, allowing the CO₂ to be released, which can then be compressed, transported and stored in geological features, such as depleted oil fields, or used as raw material in chemical factories. Although trees and some microbes can capture CO₂ and use it as fuel, humans have struggled to replicate the process on a large scale. Most chemical reactions involving CO₂ require expensive catalysts, high temperatures, or high pressures to make it react. The most common use of CO₂ as a chemical feedstock is in the formation of urea, which is found in around 90% of the world’s fertilisers. In the new research, published in the journal Angewandte Chemie, Soon Hong and colleagues from the Institute for Basic Science in South Korea have caught CO₂ from exhaust gas and used it for many reactions that make useful chemicals. One type is called alkynyl carboxylic acid, which has many uses such as making food additives. The other, cyclic carbonate, is used to make polymers for cars and electronics ...Zum vollständigen Artikel

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