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Cu-SSZ-13 crystallized for 72 h shows excellent hydrothermal stability, NO x removal activity and N 2 selectivity even under high space velocity (640 000 h −1 ). Aging treatments lead to the transform of some Cu species from isolated Cu 2+ to new complexes and dealuminization of the zeolites framework, contributing to catalyst deactivation.
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Wang et al. (2014) studied this question.
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