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Birmingham University researchers have developed an on-board reformer that helps convert exhaust gas into fuel while also removing pollutants simultaneously.

The fuel efficiency of modern vehicles has improved over the years thanks to advanced engine designs, weight reductions, and hybrid technologies. However car makers are still 15-30 per cent short of their 2020/21 target of 95g/km, contends Birmingham’s Dr Athanasios Tsolakis.

To help meet this target, Tsolakis and his colleagues are developing a catalyst-based reformer capable of improving the fuel economy and therefore greenhouse gas emissions of petrol engines.

“The system uses the engine exhaust gas, consisting of heat, water, CO2 and in some cases O2, and fuel to produce a hydrogen-rich gas that is then used for combustion in the engine,” Tsolakis said.

The on-going EPSRC-funded project, which also includes researchers at Brunel University, as well as Ford and Johnson Matthey, will use platinum/rhodium (Pt-Rh)-based catalysts to produce the hydrogen-rich gas, which can then be used for combustion.

“This means that the engine fuel – gasoline and hydrogen–rich gas – has a higher energy content, opines Tsolakis. He further states that this will also help reduce engine pumping losses by allowing for a more favourable throttle position.

The technology can also be designed to reduce emissions from diesel engines, says Tsolakis. It can indirectly improve diesel engine fuel efficiency by improving the performance of after-treatment systems.

Existing after-treatment systems can use large quantities of fuel to remove pollutants from the exhaust, but the new reformer would need only a few parts per million of hydrogen to operate, contends Tsolakis.

In the first stage of the project, the fuel reformer will be integrated into the exhaust, to provide small quantities of hydrogen-rich gas to the engine’s after-treatment system, when needed.

Later, the researchers plan to develop a compact catalyst brick, designed using additive manufacturing techniques, which can be integrated into the after-treatment system itself in both diesel and lean combustion petrol engines.

Image credit and content: The Engineer

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