February 24, 2024


Discover The Difference

Putting climate-positive business suggestions into exercise

More and a lot more ETH Zurich researchers are getting the plunge into entrepreneurship. By launching spin-​offs, they hope to flip their lab findings into methods that can help stem the rise in atmospheric carbon dioxide.

There is no lack of evidence for what the Fifth Evaluation Report of the Intergovernmental Panel on Climate Change (IPCC) describes as an “unequivocal warming of the climate system”. At no issue in the earlier 800,000 a long time has the concentration of greenhouse gases in the ambiance been as significant as it is these days. Since 1750, human activity has brought about 555 billion tonnes of carbon dioxide to be introduced into the environment, increasing the focus of carbon dioxide by 40 per cent over pre-​industrial amounts. In between 1880 and 2012, the average temperature of the Earth’s surface area rose by .85 degrees Celsius. And with world snow and ice cover steadily shrinking, sea ranges are mounting by an typical of 3 millimetres a 12 months.

Experts are united in their perception that humanity need to do almost everything in its energy to slow the increase in the focus of greenhouse gases in the ambiance, or even reverse it. There has been a apparent enhance in initiatives by ETH Zurich scientists to come up with possible options for local climate modify. And raising numbers of them are also venturing beyond the walls of academia and striving to put local weather-​positive small business ideas into follow. Of the 242 spin-​offs set up at ETH Zurich considering that 2010, 34 are pursuing approaches to fight world warming. In this short article, we get a closer look at two illustrations: a person from the energy sector, the other from the 
construction sector.

Carbon-​neutral fuels produced from sunlight and air

Due to the fact its founding in 2016, Synhelion has been doing the job on something that seems almost way too fantastic to be genuine: a photo voltaic technological know-how that can reverse the combustion procedure. The company’s mission is to develop synthetic liquid fuels completely from daylight and air. Known as photo voltaic fuels, these launch only as much CO2 all through combustion as was earlier extracted from the air in 
order to make them, thus supplying them the opportunity to make the transportation sector almost carbon-​neutral. Taken as a full, air, sea and street transport at this time launch some eight billion tonnes of carbon dioxide into the atmosphere, producing it accountable for a quarter of anthropogenic CO2 emissions.

“We consider that liquid solar fuels have an crucial function to enjoy in the strength changeover,” states Gianluca Ambrosetti, CEO of Synhelion. He rightly points out that no other strength provider will come near to matching the vitality density and extensive-​term storage capabilities of liquid fuels. “What’s extra, our photo voltaic fuels are a drop-​in technologies, which indicates they really don’t have to have any added infrastructure,” says Ambrosetti. “They can be processed in existing refineries and dispersed via the network of filling stations that is previously in place.”

Hugely concentrated photo voltaic radiation

Synhelion’s ingenious solar technologies is based on a few improvements originally made by a group of scientists led by Aldo Steinfeld, Professor of Renewable Vitality Carriers at ETH Zurich. Synhelion is now trying to get to take these improvements to the following stage. The to start with is the photo voltaic receiver, a black chamber made up of a greenhouse gasoline. Solar radiation – concentrated a number of thousand times by mirrors – shines through the quartz glass window that fronts this chamber and heats up the gasoline to properly in excess of 1,000 levels Celsius. The 2nd innovation is the ceramic foam engineering used in the thermochemical reactor. When heated to a enough temperature by the very hot fuel, this reactor is ready to split h2o and carbon dioxide to make syngas, a mixture of hydrogen and carbon monoxide. Traditional procedures can then be utilized to transform this syngas into liquid fuels this sort of as methanol, gasoline and kerosene. The third innovation is a thermal energy-​storage procedure that can be utilized to push the reactor procedures at night time and on overcast days.

A 12 months and a half have passed because Steinfeld and his team established up a mini-​refinery, which generates around a single decilitre of methanol a working day, on the roof of the Equipment Laboratory constructing at ETH
Zurich. “This pilot plant proves that we can make sustainable gas from sunlight and air underneath serious-​life disorders,” says Steinfeld.

The up coming objective, claims Ambrosetti, is to scale up the processes, improve the efficiency and travel down prices. Ambrosetti acknowledges that individuals could have doubts about scalability: “I think it will be at minimum 5 extra many years prior to we can start out applying this engineering on an industrial scale.” That is why Synhelion is developing an interim remedy, identified as photo voltaic upgrading, to shorten the time to marketplace. “By incorporating methane to the mixture of water vapour and carbon dioxide gas, the temperature needed for thermochemical conversion into syngas can be reduced to as small as 800 levels Celsius,” claims Ambrosetti. “This simplifies the full process, which implies it should only just take us two more years to get to the place where we can generate inexpensive photo voltaic fuels that launch fifty percent the net CO2 emissions of fossil fuels.”

Turning carbon dioxide into stone

Neustark – an ETH spin-​off started in 2019 – is pursuing a organization design based mostly on an fully diverse principle. The firm is establishing a know-how that turns carbon dioxide into stone by binding it with concrete mixture, therefore transforming it into large-​grade limestone. The rewards consist of both equally an upgraded mixture and prolonged-​term carbon storage. “The building market has so far made very little development in decreasing emissions – and that is mainly because so a lot investigation just receives submitted away and hardly ever applied,” states Johannes Tiefenthaler, one of the spin-​off’s two founders. “I would like to see the hard work that I’m putting 
into my doctorate make a tangible difference someplace.”

As section of his Master’s degree, Tiefenthaler was already investigating different methods of changing carbon dioxide into limestone by reacting it with minerals. There are sufficient minerals on Earth to bind hundreds of billions of tonnes of carbon dioxide. Nevertheless, as Tiefenthaler points out, a lot of of them – these as magnesium silicate – are not specifically reactive, so they should initially be heated to 700 degrees Celsius. In contrast, demolition rubble broken into concrete combination has established to be hugely reactive due to the substantial overall area space of the a lot of particles, just about every just a handful of millimetres in sizing. As a result, the concrete mixture types really steady chemical compounds with carbon dioxide, with no the require for any pre-​treatment.

“What I like about this resolution is that it is ready to go now, not just in 5 or 10 yrs,” says economist Valentin 
Gutknecht, Neustark’s next founder. The key challenge suitable now, he states, is juggling all the different problems included. “As nicely as making certain the houses of the concrete are just right, we also have to navigate the convoluted internet of CO2 certification.”

Destructive CO2 emissions provide financial advantages

Although Tiefenthaler will work at the Division of Mechanical and Procedure Engineering to provide the subsequent era of technological innovation for the mineralisation of carbon dioxide, Gutknecht and an at any time-​growing workforce of staff are fast paced concentrating on the operational side of the business. As portion of a undertaking funded by the Federal Workplace for the Environment and the Swiss Local weather Basis, Neustark has set up a pilot plant at the Kästli concrete works in Rubigen in the vicinity of Bern. Part of this pilot plant is a dazzling orange, skip-​like container, in which liquid CO2 is extra to rubble from demolished concrete structures. Following soaking in the tub of carbon dioxide for close to two hours, the parts of concrete rubble might even now appear the exact same, but they weigh drastically a lot more because the little pores in the rough area of the concrete have absorbed around 10 kilograms of CO2 for each cubic metre.

The carbon dioxide varieties a chemical bond with the calcium oxide in the concrete rubble. This generates limestone crystals, which appreciably enhance the features of the concrete combination: by employing this recycled, upgraded mixture to make contemporary concrete, the exact energy and rigidity can be reached with a lot less cement. Concrete output throughout the world releases in excess of 2 billion tonnes of carbon dioxide into the air each individual 12 months. This signifies about 7 per cent of anthropogenic CO2 emissions. By slicing the amount of cement demanded in development, Neustark’s engineering can aid minimize the industry’s carbon footprint by eliminating some of the emissions that would normally manifest all through the production of cement.

But Gutknecht and Tiefenthaler are fast to place out one more essential edge: thanks to their ingenious technique of capturing carbon dioxide from the air, soaking it into the pores of the concrete mixture and binding it permanently into limestone, they can even reverse CO2 emissions. “There are very couple of specialized concepts that deliver authentic adverse emissions,” states Tiefenthaler. Use of these ideas has so much been confined thanks to a lack of efficient incentive schemes and company styles. “This is wherever our system is distinctive, for the reason that it displays how binding carbon dioxide can create extra value. The improved qualities of the concrete mixture prove that damaging emissions don’t have to raise costs, but can really give financial rewards,” states Gutknecht.