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Issue 2, 2015
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Synthesis of high-silica AEI zeolites with enhanced thermal stability by hydrothermal conversion of FAU zeolites, and their activity in the selective catalytic reduction of NOx with NH3

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Abstract

High-silica AEI zeolites with Si/Al ratios of 13–20 were synthesized by FAU interzeolite conversion, in which tetraethylphosphonium (TEP) cations as a structure-directing agent (SDA) and NaF or NH4F as a fluoride source were added to the starting gels. During the thermal treatment of the AEI zeolites, TEP cations in the zeolitic pores decomposed to yield the P-modified AEI zeolites with various P/Al ratios. The thermal stability of the P-modified AEI zeolite was higher than that of the non-modified AEI zeolite synthesized using the N,N-diethyl-2,6-dimethylpiperidinium cation as an SDA. The framework structure of the P-modified AEI zeolite was maintained after calcination at 1000 °C for 1 h, indicating an enhanced thermal stability by phosphorus modification. The catalytic performance of Cu-loaded AEI zeolites with different P/Al ratios in the selective catalytic reduction (SCR) of NOx with NH3 was also investigated. The NO conversion was found to increase with decreasing P/Al ratio. No decrease in the NO conversion was observed after hydrothermal treatment at 900 °C for 4 h, indicating the high potential of the P-modified AEI zeolite for NH3-SCR of NOx.

Graphical abstract: Synthesis of high-silica AEI zeolites with enhanced thermal stability by hydrothermal conversion of FAU zeolites, and their activity in the selective catalytic reduction of NOx with NH3

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Supplementary files

Article information


Submitted
21 Oct 2014
Accepted
13 Nov 2014
First published
13 Nov 2014

J. Mater. Chem. A, 2015,3, 857-865
Article type
Paper

Synthesis of high-silica AEI zeolites with enhanced thermal stability by hydrothermal conversion of FAU zeolites, and their activity in the selective catalytic reduction of NOx with NH3

T. Sonoda, T. Maruo, Y. Yamasaki, N. Tsunoji, Y. Takamitsu, M. Sadakane and T. Sano, J. Mater. Chem. A, 2015, 3, 857 DOI: 10.1039/C4TA05621C

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