Over the past decade, zeolites have found increasing commercial use in a variety of emission control technologies.  Selective catalytic reduction with urea (urea-SCR) is one of these automotive applications, where microporous materials containing either Fe or Cu cations catalyze conversion of nitrogen oxides (NOx) from diesel exhaust with ammonia to form harmless nitrogen and water.  Early adoption of zeolite-based on-road urea-SCR in Japan and the US to meet stringent regulations in 2009 and 2010, respectively, was followed by introduction in Europe in 2014.  Over the next decade, legislations in many other parts of the world, such as China, India and Brazil have potential for zeolite-based SCR catalysts being used in those countries as well.  This paper covers recent examples of Fe- and Cu-based SCR catalysts, including small-pore Cu materials, which exhibit high SCR activity and high thermal stability.

Advanced zeolite catalysis technologies for clean air

255th National Meeting (2018)

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