University of Twente researchers develop new biofuel catalyst
Oil produced from biomass, such as wood chips or plant residues, seldom has the same quality and energy content as “classical” crude oil. A new, simple catalyst, developed at the University of Twente, improves the quality of this oil before it is even transported to the refinery. This technology was selected from dozens of projects for the follow-up of CATCHBIO, the national research program that is helping to realize the European 2020 objective: 20 percent of fuel must come from renewable sources by 2020.
The oil in current-generation biofuel does not come from fruit or seed, such as palm or rape seed oil but, for example, from plant residues, pruning waste and wood chips. As a result, there is no longer any undesirable competition with the food supply. Converting plant residues, which take up a lot of space, into oil simplifies transport considerably and the product can go directly to a refinery. Blending with crude oil is already possible. However, the quality of this oil does not yet equal that of crude oil. It has a lower energy content per liter, is acid and still contains too much water. The catalyst developed by Leon Lefferts and Kulathuiyer Seshan’s group Catalytic Processes and Materials (MESA+ Institute for Nanotechnology/Green Energy Initiative) significantly improves the quality and energy content of the oil.
This is realized by heating the oil in nitrogen to 500 degrees Celsius and by applying a simple catalyst: sodium carbonate on a layer of alumina. By using this method, the energy content of the oil can be boosted from 20 to 33-37 megajoule per kilogram, which is better than crude oil and approximates the quality of diesel. The technology, recently defended by doctoral candidate Masoud Zabeti, is already being tested by KIOR in Texas, USA, on a small industrial scale, with a production of 4,500 barrels of oil per day. The quality of the oil can be improved even more by adding the material caesium, as well as sodium carbonate. “By doing so, we can, for instance, also reduce the aromatics, which are harmful when inhaled,” said Seshan.
The technology is currently being further studied, in cooperation with the University of Groningen, the Energy research Centre of the Netherlands and Utrecht University, in a new CATCHBIO program of the Netherlands Organization for Scientific Research. The Netherlands is committed to leading the way in research on technology that will help realize the European 2020 fuel objective.