91直播 researchers uncover how to turn plant waste into valuable chemicals more efficiently
Researchers at The University of Manchester and Hebei University of Technology have identified how a new class of catalyst can break down lignininto useful chemical building blocks offering a more sustainable route to replace fossil-based materials.
Lignin is a key structural component of plants, the largest renewable source of aromatic chemicals in nature, and is present in appreciable levels (up to 35%) in waste biomass, including that from agriculture and forestry sectors. However, its complex structure makes it difficult to break down efficiently, limiting its use in sustainable manufacturing.
In a study published in , the international research team including Xinyue Zhou, and from the Department of Chemical Engineering, has aided in revealing how a highly efficient 鈥渟ingle-atom catalyst鈥� species operates at the molecular level to cleave the strong chemical bonds that hold lignin together.
The catalyst uses isolated ruthenium atoms embedded in a nitrogen-doped carbon material. This design maximises catalytic performance while using very small amounts of metal, making it more efficient than conventional systems
A clearer picture of how lignin breaks apart
A major challenge in this field has been understanding exactly which parts of the catalyst are responsible for breaking lignin鈥檚 tough chemical bonds. Without this knowledge, improving catalyst performance has remained difficult.
The research shows that a specific atomic configuration 鈥� known as a 鈥淩u鈥揘鈧� site鈥� 鈥� plays a central role. These sites activate oxygen molecules and help drive the cleavage of both carbon鈥搊xygen and carbon鈥揷arbon bonds within lignin.
By combining experimental techniques with computational modelling, the team demonstrated how the catalyst first activates oxygen to form highly reactive species, which then attack the lignin structure and break it down into smaller molecules.
High efficiency under mild conditions
Under optimised conditions, the catalyst achieved near-complete conversion of model lignin compounds and produced high yields of valuable phenolic chemical products.
Importantly, the system operates under relatively mild conditions and without the need for harsh chemicals, highlighting its potential for more sustainable chemical manufacturing processes.
The catalyst was also successfully applied to real lignin samples from different biomass sources, converting them into useful aromatic compounds that could serve as building blocks for fuels, plastics and other materials.
Toward sustainable chemical production
This work provides a detailed understanding of how single-atom catalysts function in biomass conversion, offering a blueprint for designing more efficient systems in the future.
Understanding exactly how these catalysts work at the atomic level allows us to design better materials for converting renewable resources into valuable chemicals.
By enabling the upgrading and valorisation of lignin, the research supports efforts to move away from traditional linear petroleum-derived chemicals and towards a more circular, biomass-based economy.
This research was published in: ACS Catalysis
Full title of the paper: Unveiling the Role of Ru鈥揘4 on Ru鈥揘鈥揅 Single-Atom Catalyst in C鈥揙/C鈥揅 Bonds鈥� Oxidative Cleavage in Lignin
DOI: 10.1021/acscatal.5c08001
URL: https://pubs.acs.org/doi/10.1021/acscatal.5c08001