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Title: Enhanced Activity of Nanocrystalline Zeolites for Selective Catalytic Reduction of NOx

Abstract

Nanocrystalline zeolites with discrete crystal sizes of less than 100 nm have different properties relative to zeolites with larger crystal sizes. Nanocrystalline zeolites have improved mass transfer properties and very large internal and external surface areas that can be exploited for many different applications. The additional external surface active sites and the improved mass transfer properties of nanocrystalline zeolites offer significant advantages for selective catalytic reduction (SCR) catalysis with ammonia as a reductant in coal-fired power plants relative to current zeolite based SCR catalysts. Nanocrystalline NaY was synthesized with a crystal size of 15-20 nm and was thoroughly characterized using x-ray diffraction, electron paramagnetic resonance spectroscopy, nitrogen adsorption isotherms and Fourier Transform Infrared (FT-IR) spectroscopy. Copper ions were exchanged into nanocrystalline NaY to increase the catalytic activity. The reactions of nitrogen dioxides (NO{sub x}) and ammonia (NH{sub 3}) on nanocrystalline NaY and CuY were investigated using FT-IR spectroscopy. Significant conversion of NO{sub 2} was observed at room temperature in the presence of NH{sub 3} as monitored by FT-IR spectroscopy. Copper-exchanged nanocrystalline NaY was more active for NO{sub 2} reduction with NH{sub 3} relative to nanocrystalline NaY.

Authors:
;
Publication Date:
Research Org.:
University Of Iowa
Sponsoring Org.:
USDOE
OSTI Identifier:
921000
DOE Contract Number:  
FG26-06NT42739
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 74 ATOMIC AND MOLECULAR PHYSICS; ADSORPTION ISOTHERMS; AMMONIA; CATALYSIS; CATALYSTS; COPPER IONS; ELECTRON SPIN RESONANCE; MASS TRANSFER; NITROGEN; NITROGEN DIOXIDE; POWER PLANTS; SELECTIVE CATALYTIC REDUCTION; SPECTROSCOPY; SURFACE AREA; X-RAY DIFFRACTION; ZEOLITES

Citation Formats

Sarah C. Larson, and Vicki H. Grassian. Enhanced Activity of Nanocrystalline Zeolites for Selective Catalytic Reduction of NOx. United States: N. p., 2006. Web. doi:10.2172/921000.
Sarah C. Larson, & Vicki H. Grassian. Enhanced Activity of Nanocrystalline Zeolites for Selective Catalytic Reduction of NOx. United States. doi:10.2172/921000.
Sarah C. Larson, and Vicki H. Grassian. Sun . "Enhanced Activity of Nanocrystalline Zeolites for Selective Catalytic Reduction of NOx". United States. doi:10.2172/921000. https://www.osti.gov/servlets/purl/921000.
@article{osti_921000,
title = {Enhanced Activity of Nanocrystalline Zeolites for Selective Catalytic Reduction of NOx},
author = {Sarah C. Larson and Vicki H. Grassian},
abstractNote = {Nanocrystalline zeolites with discrete crystal sizes of less than 100 nm have different properties relative to zeolites with larger crystal sizes. Nanocrystalline zeolites have improved mass transfer properties and very large internal and external surface areas that can be exploited for many different applications. The additional external surface active sites and the improved mass transfer properties of nanocrystalline zeolites offer significant advantages for selective catalytic reduction (SCR) catalysis with ammonia as a reductant in coal-fired power plants relative to current zeolite based SCR catalysts. Nanocrystalline NaY was synthesized with a crystal size of 15-20 nm and was thoroughly characterized using x-ray diffraction, electron paramagnetic resonance spectroscopy, nitrogen adsorption isotherms and Fourier Transform Infrared (FT-IR) spectroscopy. Copper ions were exchanged into nanocrystalline NaY to increase the catalytic activity. The reactions of nitrogen dioxides (NO{sub x}) and ammonia (NH{sub 3}) on nanocrystalline NaY and CuY were investigated using FT-IR spectroscopy. Significant conversion of NO{sub 2} was observed at room temperature in the presence of NH{sub 3} as monitored by FT-IR spectroscopy. Copper-exchanged nanocrystalline NaY was more active for NO{sub 2} reduction with NH{sub 3} relative to nanocrystalline NaY.},
doi = {10.2172/921000},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 31 00:00:00 EST 2006},
month = {Sun Dec 31 00:00:00 EST 2006}
}

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