Research Article

Dynamic multinuclear sites formed by mobilized copper ions in NOx selective catalytic reduction

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Science  01 Sep 2017:
Vol. 357, Issue 6354, pp. 898-903
DOI: 10.1126/science.aan5630

X-ray vision spies copper on the move

Copper ions in zeolites help remove noxious nitrogen oxides from diesel exhaust by catalyzing their reaction with ammonia and oxygen. Paolucci et al. found that these copper ions may move about during the reaction (see the Perspective by Janssens and Vennestrom). Zeolite catalysts generally fix metals in place while the reacting partners flow in and out of their cagelike structures. In this case, though, x-ray absorption spectroscopy suggested that the ammonia was mobilizing the copper ions to pair up as they activated oxygen during the catalytic cycle.

Science, this issue p. 898; see also p. 866

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