The discovery offers a way to convert 100% of carbon dioxide captured from industrial exhaust into ethylene, a key building block for plastics, and major product made from ethylene.
While researchers have been exploring the possibility of converting carbon dioxide to ethylene for more than a decade, the UIC team’s approach is the first to achieve nearly 100% utilization of carbon dioxide to produce hydrocarbons
The process can convert up to 6 metric tons of carbon dioxide into 1 metric ton of ethylene, recycling almost all carbon dioxide captured. Because the system runs on electricity, the use of renewable energy can make the process carbon negative.
According to Singh, his team’s approach surpasses the net-zero carbon goal of other carbon capture and conversion technologies by actually reducing the total carbon dioxide output from industry. “It’s a net negative,” he said. “For every 1 ton of ethylene produced, you’re taking 6 tons of CO2 from point sources that otherwise would be released to the atmosphere.”
Previous attempts at converting carbon dioxide into ethylene have relied on reactors that produce ethylene within the source carbon dioxide emission stream. In these cases, as little as 10% of CO2 emissions typically converts to ethylene. The ethylene must later be separated from the carbon dioxide in an energy-intensive process often involving fossil fuel energy.
In UIC’s approach, an electric current is passed through a cell, half of which is filled with captured carbon dioxide, the other half with a water-based solution. An electrified catalyst draws charged hydrogen atoms from the water molecules into the other half of the unit separated by a membrane, where they combine with charged carbon atoms from the carbon dioxide molecules to form ethylene.
Among manufactured chemicals worldwide, ethylene ranks third for carbon emissions after ammonia and cement. Ethylene is used not only to create plastic products for the packaging, agricultural and automotive industries, but also to produce chemicals used in antifreeze, medical sterilizers and vinyl siding for houses.
Ethylene is usually made in a process called steam cracking that requires enormous amounts of heat. Cracking generates about 1.5 metric tons of carbon emissions per ton of ethylene created. On average, manufacturers produce around 160 million tons of ethylene each year, which results in more than 260 million tons of carbon dioxide emissions worldwide.
In addition to ethylene, the UIC scientists were able to produce other carbon-rich products useful to industry with their electrolysis approach. They also achieved a very high solar energy conversion efficiency, converting 10% of energy from the solar panels directly to carbon product output. This is well above the state-of-the-art standard of 2%. For all the ethylene they produced, the solar energy conversion efficiency was around 4%, approximately the same rate as photosynthesis.
This is the kind of news that has to snap the attention of independent petroleum producers and the coal industry. As the process matures we might see a gradual shift from the fossil fuel sources to a form of a current CO2 recycling norm. The press release is driven in part by the CO2 effluent that ranks #3 from ethylene production. There is much more available CO2 from the ammonia, cement, power generation and other large concentrated CO2 sources. While the 4% efficiency rank isn’t going to light everyone up, note that 4% is about where nature is satisfied after hundreds of millions of years with great results. The notation of 10% from solar panels is impressive and suggests further improvements might come over time.
Plastics are an obvious target as the energy input is concentrated and large. But there are other opportunities, and this new technology just begs for much more and broader attention and effort.
Lots of question remain. Is the oxygen from the water that’s lost its hydrogen just vented? Then how does this compare to water electrolysis as the freed hydrogen is already locked up in a carbon based gas?
If other products are likely forthcoming a selection of light petroleum gasses like methane, propane and butane are possible too? Then is there a probability that liquid alcohols could also be forthcoming? Should this technology gain development and market traction will the optimum product trigger fuel cell development for it too?
Yup. Big News Indeed! Congratulations to the team at UIC!
By Brian Westenhaus via New Energy and Fuel
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