Smart particle could hold climate change key

Promethean Particles, in Nottingham, is working with metal-organic frameworks (MOFs) - tiny nanoparticles that have extremely large internal surface areas.

One teaspoon of the super adsorbent particles contains the equivalent area of two tennis courts.

The company is hoping to use the new financing, which has been led by Mercia Ventures and Aramco Ventures, to build a bigger manufacturing facility and expand its team.

James Stephenson, CEO of Promethean Particles, says cheap materials are key

It is also aiming to drive down the price of MOFs from tens of thousands of pounds to just £25 per kilo.

The key to reducing the price and scaling up production would be to make the nanoparticles from cheap, widely available metals such as zinc and magnesium.

James Stephenson, chief executive officer (CEO) of Promethean, said: "MOFs are an incredible class of materials that have shown all kinds of potential in lots of applications."

Their internal surfaces can be lab-engineered to become "sticky" for different gases.

Out in the real world, the nanoparticles can act as both mini-sponges and mini-sieves, able to both separate and store large volumes of different gases.

These properties could be used to reduce the climate impact of producing cement, metals and energy, which continue to emit huge quantities of greenhouse gases.

MOF particles from Promethean are already being used in a prototype carbon capture unit at Drax power station in Yorkshire.

Carbon capture and storage (CCS) has long been proposed as essential to national plans for a carbon-neutral future.

The idea is that carbon dioxide from energy-hungry industries is intercepted before it enters the atmosphere and is then transported for permanent storage deep underground.

The UK has announced several carbon capture projects as part of its pledge to capture and store 20 to 30 million tonnes of carbon dioxide a year by 2030.

Yet so far, CCS has proved expensive and energy-intensive. No large-scale project is yet up and running.

Critics see it as a dangerous distraction from the need to rapidly reduce emissions.

The potential for MOFs to first filter out greenhouse gases at source, and then store them for easier transportation, is what has got the experts excited.

But up to now, the cost of these nanoparticles has made that eye-wateringly expensive.

If MOFs could be produced for a fraction of the current price, it could be a game-changer for CCS and good news for a fast-warming planet.

Mr Stephens said the challenge ahead was what brought him and the team to work every day.

He said: "We see, and the world agrees, that carbon capture is needed as part of the solution [to the energy transition]. The existing carbon capture technologies have significant challenges in terms of the energy that's used.

"We are very much about the mission that we're on, and we see every day that we can make a significant difference to some of these global issues."

Selina Ambrose, product manager at the University of Nottingham spin-out, said: "There's so much more that we can be doing with MOF development and scaling up."

Additional scientists and engineers would scale up production and research to "show the world what MOFs can really do", she added.

-BBC