(Iowa State University) An Iowa State University research team that helped develop a demonstration-scale pyrolyzer capable of sequestering thousands of tons of carbon dioxide a year has received a prestigious milestone award from XPRIZE Carbon Removal, it was announced on Friday.
The milestone prize provides $1 million to the carbon removal team at the Bioeconomy Institute to help advance its vision of using pyrolysis to remove carbon dioxide, a major greenhouse gas, from the atmosphere, thus slowing climate change. The carbon removal team is also in the running for an even larger award from XPRIZE of up to $50 million that will be determined in 2025. XPRIZE announced 15 milestone awards on Friday to coincide with Earth Day, selecting the winners from a field of 1,133 teams seeking to combat climate change by finding innovative means of removing greenhouse gases from the atmosphere.
Robert Brown, Iowa State Anson Marston Distinguished Professor in Engineering, the Gary and Donna Hoover Chair in Mechanical Engineering and co-director of Iowa State’s Bioeconomy Institute, said the milestone prize validates the research team’s approach to carbon sequestration, which centers on a process known as pyrolysis. During pyrolysis, biomass is heated in the absence of oxygen, yielding a carbon-rich material known as biochar, which is a form of charcoal. Brown and his team have shown that biochar is an effective means of storing carbon in the soil, a practice known as sequestration, which keeps the carbon out of the atmosphere.
How pyrolysis sequesters carbon
Plants draw carbon dioxide out of the atmosphere to produce biomass as part of photosynthesis. But that carbon storage is often temporary. When plants die and decay, they release that stored carbon back into the atmosphere. The carbon removal team at the Bioeconomy Institute uses biomass from crop residues, wood and perennial grasses as stocks for pyrolysis while the plant matter is still rich in carbon. The biochar that results from the process can be added to agricultural fields, gardens or yards as a soil amendment that improves soil health and further increases carbon storage potential.
Pyrolysis also produces a thick, viscous liquid known as bio-oil, which can be refined into renewable diesel fuel or bio-asphalt, a renewable substitute for petroleum-based asphalt.
Iowa State currently has two pyrolyzers, a lab-scale unit installed on campus in the Biorenewables Research Laboratory and a larger pilot-scale unit at the BioCentury Research Farm outside Ames. The carbon removal team has partnered with Iowa-based Stine Seed Company and Frontline Bioenergy to build a demonstration-scale pyrolyzer near Redfield, Iowa, northwest of Des Moines. The new pyrolyzer is slated to come online this summer and will be capable of capturing and sequestering the equivalent of over 1,000 tons of carbon dioxide a year. That scale made the team eligible for the XPRIZE award.
The ISU scientists have developed a means of making the new pyrolyzer self-heating, improving its cost-effectiveness and environmental performance. This “auto-thermal pyrolyzer” works by pumping a small amount of air into the reactor, which causes some of the products of pyrolysis to partially oxidize and give off heat.
“Pyrolysis does require energy to heat the biomass, but we’re now able to self-heat the process,” Brown said.
About the $100M XPRIZE Carbon Removal
XPRIZE, a non-profit that hosts competitions intended to spur technological advancement to benefit humanity, seeks to reward innovative solutions to global challenges. XPRIZE has announced a prize purse of $100 million, which it touts as the largest incentive prize in history, for effective approaches to carbon removal, funded by Elon Musk and the Musk Foundation. The winning entrant must demonstrate solutions that can pull carbon dioxide directly from the atmosphere or oceans at a scale of at least 1,000 tons per year. Entrants must also model their costs and demonstrate a possibility to scale up their approach to gigatons of carbon storage in the future.
XPRIZE will hand out a $50 million grand prize to the top entrant, along with other $30 million prizes to other teams, an acknowledgement that it will likely take a variety of carbon removal approaches to avert an impending climate crisis.
“Even if we make heroic efforts to reduce the rates of global greenhouse gas emissions, we’ll still overshoot the targets necessary to avoid large climate impacts,” Brown said. “We need to look at solutions that actively remove carbon dioxide from the atmosphere. We think pyrolysis will be one of those solutions.” READ MORE
- Calcite from 8 Rivers Capital - U.S.
- Carbyon - Netherlands
- Heirloom & Carbfix - U.S. & Iceland
- Project Hajar - U.K.& Oman
- Sustaera - U.S.
- Verdox & Carbfix - U.S. & Iceland
Land
- Bioeconomy Institute Carbon Removal Team from Iowa State - U.S.
- Global Algae Innovations - U.S.
- NetZero - France
- PlantVillage from Penn State - U.S.
- Takachar & Safi Organics from University of British Columbia - Kenya
Ocean
- Captura from California Institute of Technology - U.S.
- Marine Permaculture SeaForestation from the Climate Foundation - U.S., the Philippines & Australia
- Planetary - Canada
Rocks
- Carbin Minerals from University of British Columbia, Vancouver - Canada
The competition now completely resets before the remaining $80M prize purse is awarded in 2025. Any team is eligible to win, whether they participated in this Milestone Round or not. Registration is open for any team interested in joining the competition to compete for the Grand Prizes. Registration closes on December 1, 2023. To win the Grand Prize, teams must demonstrate a working solution at a scale of at least 1,000 tonnes removed per year, model their costs at a scale of 1 million tonnes per year, and show a pathway to achieving a scale of gigatonnes per year in future, as validated by a third party. The Grand Prize winner and runners up will be announced on Earth Day 2025. READ MORE
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