Wednesday, 25 July 2018

Hydrogen and Plastic Production - New Catalyst With a Dual Function

Source: Ruhr-Universität Bochum (RUB), 24th July 2018, by Julia Weiler

Plastic production with this catalyst would be sustainable and would also enable the creation of hydrogen as a potential energy source.

Chemists at Ruhr-Universität Bochum (RUB) have developed a new, low-cost catalyst for plastic production. It turns a biorefinery product into a starting material for the synthesis of plastics, which could represent a sustainable alternative to widespread PET. At the same time, the potential energy source hydrogen can also be formed during the reaction. During the study, the team surrounding Dr Stefan Barwe and Prof Dr Wolfgang Schuhmann from the Bochum-based Centre for Electrochemical Sciences cooperated with the RUB Laboratory of Industrial Chemistry under the leadership of Prof Dr Martin Muhler. The researchers describe the work in the journal Angewandte Chemie from 9th July 2018.

“We could take a big step towards a sustainable chemicals industry if we did not use crude oil as the starting material, but rather biomass that is not used as a foodstuff,” says Wolfgang Schuhmann.

Image: The Bochum team: Dulce Morales, Steffen Cychy, Stefan Barwe, Dennis Hiltrop, Martin Muhler and Wolfgang Schuhmann (from left) © RUB, Marquard

An alternative to PET

In their study, the Bochum-based researchers present a nickel boride catalyst which – as it does not contain any precious metals – is readily available and affordable compared to many other catalysts. It can turn the biorefinery product HMF (5-hydroxymethyl-furfural) into FDCA (2,5-furandicarboxylic acid). “FDCA is interesting for the industry because it can be processed into polyesters,” explains Stefan Barwe. “PEF, an alternative to PET, can thus be produced – and all of this is based on renewable raw materials, i.e. plants.”

Less energy consumption thanks to hydrogen production

In the tests conducted by the Bochum-based team, the catalyst turned 98.5 percent of the starting material HMF into FDCA in half an hour; no waste products are created. “We have also designed the catalyst in such a way that it is effective under the same conditions under which hydrogen production is also successful,” Stefan Barwe describes a further benefit of the development. The researchers were thus also able to use the starting material to synthesise hydrogen as a the potential energy source. Hydrogen is usually acquired from water using electrolysis, which also produces oxygen. The particularly energy-consuming reaction step, oxygen evolution, was eliminated when the researchers linked up hydrogen evolution and FDCA production.

Reaction mechanism clarified

The team also clarified the reaction step by step using electrochemical methods and infrared spectroscopy. For the first time, the chemists were able to track in real time which intermediate products turn HMF into FDCA.

Funding

The German Research Foundation supported the work as part of the cluster of excellence Ruhr Explores Solvation (EXC 1069) and the Collaborative Research Centre/Transregio 247. Dulce Morales, one of the authors, received financial support from the German Academic Exchange Service and from Consejo Nacional de Ciencia y Tecnología.

Original publication

Stefan Barwe, Jonas Weidner, Steffen Cychy, Dulce M. Morales, Stefan Dieckhöfer, Dennis Hiltrop, Justus Masa, Martin Muhler, Wolfgang Schuhmann: Electrocatalytic 5-(hydroxymethyl)furfural oxidation using high surface area nickel boride, in: Angewandte Chemie International Edition, 2018, DOI: 10.1002/anie.201806298

Press contact

Prof Dr Wolfgang Schuhmann
Analytical Chemistry
Centre for Electrochemical Sciences
Faculty of Chemistry and Biochemistry
Ruhr-Universität Bochum
Germany
Phone: +49 234 32 26200
Email: wolfgang.schuhmann@rub.de

For more information about Ruhr-Universität Bochum (RUB), please visit www.rub.de