Economical synthesis of high-silica LTA zeolites: A step forward in developing a new commercial NH3-SCR catalyst
SCIE
SCOPUS
- Title
- Economical synthesis of high-silica LTA zeolites: A step forward in developing a new commercial NH3-SCR catalyst
- Authors
- Jo, Donghui; Park, Gi Tae; Ryu, Taekyung; Hong, Suk Bong
- Date Issued
- 2019-04
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/95259
- DOI
- 10.1016/j.apcatb.2018.10.042
- ISSN
- 0926-3373
- Article Type
- Article
- Citation
- APPLIED CATALYSIS B-ENVIRONMENTAL, vol. 243, page. 212 - 219, 2019-04
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