23^rd May 2012

OXFORD CATALYSTS GROUP PLC

("Oxford Catalysts" or "the Group" or "the Company")

Successful Start-up of Commercial Scale FT Reactor

Oxford Catalysts Group PLC, the leading technology innovator for synthetic fuels production, is pleased to announce the successful start-up of a commercial scale Fischer-Tropsch ("FT") reactor at a client facility, with performance matching expectations.

This is the Group's first ever start-up of a commercial scale FT unit (with a nominal capacity of over 25 bpd). It is being operated by an integrated energy company, at their facility, to provide detailed engineering information for the design of commercial synthetic fuels plants. Construction and operation of such medium scale modular facilities at sites around the world is a central part of the customer's strategy. The reactor is expected to operate for three to six months.

The Group announced the sale of this reactor on 9^th January 2012. The short time from sale to start-up was a result of close collaboration between the Group and its client, as well as the client having an existing facility into which the reactor could be easily integrated.

Roy Lipski, CEO of Oxford Catalysts Group said:

"This is a true milestone for the Group and our client. We're excited to prove the capabilities of our technology at this commercially significant scale, and are confident that it will meet our customer's needs and facilitate their ambitious plans for widespread commercial synthetic fuels production."

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Notes to Editors

Oxford Catalysts enables modular Gas-to-Liquids ("GTL") plants to convert unconventional, remote and problem gas into valuable liquid fuels. Systems based on the Group's technology (marketed under the brand name Velocys) are significantly smaller than those using conventional technology, enabling modular plants that can be deployed cost effectively in remote locations and on smaller fields than is possible with competing systems. Together with world-class partners, Oxford Catalysts provides complete modular GTL solutions that address an untapped market of up to 25 million barrels of fuel a day.

Oxford Catalysts Group PLC is listed on the AIM market of the London Stock Exchange (LSE: OCG). The Group has some 85 employees with facilities near Oxford, UK and Columbus, Ohio, USA.

www.oxfordcatalysts.com

www.velocys.com