Sub-micron Cu/SSZ-13: Synthesis and application as selective catalytic reduction (SCR) catalysts.
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| Title: | Sub-micron Cu/SSZ-13: Synthesis and application as selective catalytic reduction (SCR) catalysts. |
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| Authors: | Prodinger, Sebastian1, Derewinski, Miroslaw A.1 miroslaw.derewinski@pnnl.gov, Wang, Yilin1, Washton, Nancy M.2, Walter, Eric D.2, Szanyi, János1, Gao, Feng1 feng.gao@pnnl.gov, Wang, Yong1,3, Peden, Charles H.F.1 |
| Source: | Applied Catalysis B: Environment & Energy. Feb2017, Vol. 201, p461-469. 9p. |
| Subjects: | Catalytic reduction, X-ray diffraction, Nitrogen oxides, Particle size determination, Chemical stability, Copper ions |
| Abstract: | For the first time, sub-micron Cu/SSZ-13, obtained by modifying an existing synthesis procedure, was shown to be an effective and stable catalyst for selective catalytic reduction of NO. Characterization of the materials with X-ray diffraction, N 2 -physisorption and 27 Al MAS NMR shows that hydrothermal aging, which simulates SCR reaction conditions, is more destructive for smaller particles in a sodium form. After Cu exchange, however, the catalytic performance and hydrothermal stability for Cu/SSZ-13 is independent of the particle size. In particular, a clear positive correlation is found between remaining tetrahedral framework Al and isolated Cu-ion concentrations in aged Cu/SSZ-13 catalysts of comparable Al and Cu contents. This indicates that (1) isolated Cu-ion and paired framework Al configurations display remarkable hydrothermal stabilities; and (2) paired-Al contents can be varied via modifying the synthesis procedures, which appear to have a more critical influence on stabilizing isolated Cu-ions during harsh hydrothermal aging than the particle size. This study is of high interest for applications in vehicular DeNOx technologies where high loadings of active species on wash coats can be achieved by using sub-micron Cu/SSZ-13. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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