Sir John Meurig Thomas or JMT (born 15 December 1932) is a Welsh chemist, historian of science and educator primarily known for his work on heterogeneous catalysis, solid-state chemistry, and surface and materials science.
Much of his research has involved creating new solid catalysts and trying to understand the structure and activity of existing ones using techniques such as X-ray absorption, NMR spectroscopy, and high resolution transmission electron microscopy.
In recent years, he has focused on designing green chemistry catalysts for clean technology and on developing ways of studying catalysts in situ.In 1991 Thomas was knighted "for services to chemistry and the popularisation of science".
Thomas has authored more than 1200 scientific articles and several books, including Michael Faraday and the Royal Institution: The Genius of Man and Place (1991),Principles and Practice of Heterogeneous Catalysis (with W.
John Thomas, 1997, 2014), and Design and Applications of Single-Site Heterogeneous Catalysts: Contributions to Green Chemistry, Clean Technology and Sustainability (2012).
The mineral meurigite is named after him.