The speedy reduction of worldwide CO2 emissions is one of the most pressing and challenging tasks of our time. Alongside the strategy of avoiding CO2 emissions altogether, there are a number of technologies which transform unavoidable CO2 into valuable products. But these so-called power-to-X processes are currently still inefficient and expensive. Scientists at the Fraunhofer Institute for Ceramic Technologies and Systems IKTS in Dresden have developed reactors based on ceramics, which use CO2 and water vapor to produce raw materials for the chemical industry in a much more efficient and climate-neutral way.
As one of the world’s largest economies, Germany ranks sixth worldwide in terms of CO2 emissions. In the industrial sector alone, 188 million tons of CO2 are produced each year.
At the same time, Germany must significantly increase the share of renewable energies in its electricity supply in order to achieve its climate targets. However, these renewable energies fluctuate over time and are not unlimited. It is therefore important to use them intelligently and above all efficiently.
Various strategies are currently being pursued for the use of unavoidable CO2 emissions, for example to produce chemical raw materials (X). For this process to be as climate-neutral as possible, the power required for it must be obtained from renewable energies – in this way climate-damaging CO2 is used to manufacture climate-neutral products.
Current power-to-X processes still too expensive
However, such power-to-X processes are still too inefficient because they consist of many complex individual processes. Scientists at Fraunhofer IKTS have now succeeded in developing a pilot plant – consisting of ceramic-based reactors – in which CO2 can be converted into climate-neutral chemical raw materials. In these reactors, the individual processes are smartly coupled, and material and energy flows intensified. This increases efficiency compared to previous power-to-X processes.
Coupling co-electrolysis with Fischer-Tropsch synthesis
Unavoidable CO2 emissions occur in large quantities for example in the cement and lime industries. Fraunhofer IKTS uses a wide range of ceramic components and technologies to harness this CO2. For example, ceramic filter cartridges remove dust from exhaust fumes. The CO2 can only be filtered out by ceramic membranes after such coarse cleaning.
The CO2 thus obtained is converted into carbon monoxide at over 750 °C in a newly developed ceramic high-temperature electrolysis reactor. At the same time – and this is remarkable – hydrogen is produced from steam in the same reactor, hence the name co-electrolysis. Put together, carbon monoxide and hydrogen form synthesis gas.
The reactors used are electrolysis stacks (SOEC). They were developed at IKTS and have already successfully demonstrated a long-term stability of more than 4000 hours. Compared to established alkaline or PEM electrolysis, high-temperature electrolysis requires considerably less electrical energy and also enables the direct production of synthesis gas. To produce this in a climate-neutral way, the electrolysis reactor is operated with electricity generated from renewable sources.
In a subsequent Fischer-Tropsch reactor, also developed at IKTS, the synthesis gas is then converted into chemical raw materials - for example into long-chain hydrocarbons.
Increased efficiency of the power-to-X system
"We have demonstrated on a laboratory scale that the individual processes of a power-to-X system can be intelligently coupled and combined. This is what makes our reactor concept so efficient. In the next step towards upscaling, we will build a power-to-X plant with an output of 10 kW.
On the basis of previous laboratory results and realistic assumptions for the operation of the production plant on an economic scale, we expect a significant increase in efficiency compared to today's plants," explains Dr. Matthias Jahn, project manager and head of department Chemical Engineering at Fraunhofer IKTS.
Such an increase in efficiency to over 55 % can only be achieved through closed and thus environmentally friendly material and energy cycles. This means that by-products, such as short-chain hydrocarbons and waste heat, are no longer released into the environment, but flow directly back into the system.
"We are now looking at the next steps so that in the future many more products can be produced from CO2 emissions in a climate-neutral way. A reactor concept of this kind can also be applied to the production of lubricants, waxes for the cosmetics industry or the production of fuel additives with improved combustion properties," summarizes Dr. Matthias Jahn. The scientists are also focusing on further automation and controllability of the individual processes.
Transfer to pilot scale
Within the next three years, this reactor concept will be transferred to pilot scale at the Bergmann Kalk lime works in Kasendorf in Upper Franconia. Colyssy is the name of this ambitious project, which is funded by the German Federal Ministry of Education and Research and was launched at the beginning of the year as part of the HYPOS consortium.
"If we want to achieve sector coupling via power-to-X and reduce CO2 emissions, there must be economic incentives in the future. Political framework conditions need to be adapted in such a way that the additional costs incurred for climate-neutral production are offset and the product is still competitive," Sebastian Groppweis, managing director and co-owner of the family-run Johann Bergmann Kalk company, appeals to political decision-makers.
Dipl.-Chem. Katrin Schwarz | Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Human skin is an important source of ammonia emissions
27.05.2020 | Max-Planck-Institut für Chemie
Biotechnology: Triggered by light, a novel way to switch on an enzyme
27.05.2020 | Westfälische Wilhelms-Universität Münster
In living cells, enzymes drive biochemical metabolic processes enabling reactions to take place efficiently. It is this very ability which allows them to be used as catalysts in biotechnology, for example to create chemical products such as pharmaceutics. Researchers now identified an enzyme that, when illuminated with blue light, becomes catalytically active and initiates a reaction that was previously unknown in enzymatics. The study was published in "Nature Communications".
Enzymes: they are the central drivers for biochemical metabolic processes in every living cell, enabling reactions to take place efficiently. It is this very...
Early detection of tumors is extremely important in treating cancer. A new technique developed by researchers at the University of California, Davis offers a significant advance in using magnetic resonance imaging to pick out even very small tumors from normal tissue. The work is published May 25 in the journal Nature Nanotechnology.
researchers at the University of California, Davis offers a significant advance in using magnetic resonance imaging to pick out even very small tumors from...
Microelectronics as a key technology enables numerous innovations in the field of intelligent medical technology. The Fraunhofer Institute for Biomedical Engineering IBMT coordinates the BMBF cooperative project "I-call" realizing the first electronic system for ultrasound-based, safe and interference-resistant data transmission between implants in the human body.
When microelectronic systems are used for medical applications, they have to meet high requirements in terms of biocompatibility, reliability, energy...
Thomas Heine, Professor of Theoretical Chemistry at TU Dresden, together with his team, first predicted a topological 2D polymer in 2019. Only one year later, an international team led by Italian researchers was able to synthesize these materials and experimentally prove their topological properties. For the renowned journal Nature Materials, this was the occasion to invite Thomas Heine to a News and Views article, which was published this week. Under the title "Making 2D Topological Polymers a reality" Prof. Heine describes how his theory became a reality.
Ultrathin materials are extremely interesting as building blocks for next generation nano electronic devices, as it is much easier to make circuits and other...
Scientists took a leukocyte as the blueprint and developed a microrobot that has the size, shape and moving capabilities of a white blood cell. Simulating a blood vessel in a laboratory setting, they succeeded in magnetically navigating the ball-shaped microroller through this dynamic and dense environment. The drug-delivery vehicle withstood the simulated blood flow, pushing the developments in targeted drug delivery a step further: inside the body, there is no better access route to all tissues and organs than the circulatory system. A robot that could actually travel through this finely woven web would revolutionize the minimally-invasive treatment of illnesses.
A team of scientists from the Max Planck Institute for Intelligent Systems (MPI-IS) in Stuttgart invented a tiny microrobot that resembles a white blood cell...
19.05.2020 | Event News
07.04.2020 | Event News
06.04.2020 | Event News
28.05.2020 | Transportation and Logistics
28.05.2020 | Physics and Astronomy
28.05.2020 | Power and Electrical Engineering