Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 243, Issue -, Pages 212-219Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.10.042
Keywords
Cu-LTA; Economical synthesis; Characterization; NH3-SCR; Hydrothermal stability
Funding
- National Creative Research Initiative Program through the National Research Foundation of Korea [2012R1A3A2048833]
- MSIP
- POSTECH
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Here we report an economical synthesis method for high-silica (Si/A1 similar to 17) LTA zeolites using colloidal silica and ammonium fluoride as Si and F sources, respectively. When both 1,2-dimethy1-3-(4-methylbenzyl)imidazolium and tetramethylammonium ions are used as organic structure-directing agents, the LTA crystallization was found to strongly depend on the particle size of the colloidal silica employed. However, the type of Al and F sources had little effect on the formation of this small-pore zeolite. The catalytic properties of three high-silica Cu-LTA catalysts synthesized using the same Si source (Ludox HS-40 colloidal silica) but different Al sources (aluminum hydroxide, aluminum metal, and pseudoboehmite) for the selective catalytic reduction of NOx with NH3 (NH3-SCR) are also presented. Despite the presence of a large amount of extraframework Al, all of the catalysts exhibited considerably higher activity maintenance than the current commercial Cu-SSZ-13 catalyst even after hydrothermal aging at 900 degrees C.
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