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IR studies of Fe modified ZSM-5 zeolites of diverse mesopore topologies in the terms of their catalytic performance in NH3-SCR and NH3-SCO processes

Paper ID Volume ID Publish Year Pages File Format Full-Text
45489 46412 2015 10 PDF Available
Title
IR studies of Fe modified ZSM-5 zeolites of diverse mesopore topologies in the terms of their catalytic performance in NH3-SCR and NH3-SCO processes
Abstract

•Conventional microporous zeolite vs. hierarchical analogs.•Superior activity of mesostructured Fe-ZSM-5 in the NH3-SCR and NH3-SCO processes.•Isolated pseudotetrahedral Fe(III)-oxo sites as active species.

The desilication and direct synthesis route techniques were used to prepare mesostructured ZSM-5 zeolites. Iron was introduced to purely microporous and to hierarchical analogs by two-fold ion-exchange procedure using a Fe(NO3)3 solution. The results of the catalytic studies of the NH3-SCR process showed that the Fe-exchanged ZSM-5 sample prepared by direct synthesis route with amphiphilic organosilanes as a mesopore-directing agents presented the highest catalytic activity in the low temperature range comparing to the other catalyst studied. Moreover, the Fe-catalysts revealed high catalytic performance in the NH3-SCO process. High catalytic activity of the studied samples was related to high concentration of mononuclear Fe3+ cations with pseudo-Td or Oh coordination, guaranteed by the enhanced mesopore area of zeolite support, as well as with high acidity of the zeolite itself. The facility of the transport of the reactants to and from the active surface sites seems to be also ensured by highly developed system of mesopores. IR studies of adsorption forms both of nitrogen monoxide and ammonia as well as the products of their conversion gave insight into the NH3-SCR and NH3-SCO reaction mechanisms.

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Keywords
Fe-zeolites; ZSM-5; NH3-SCR and NH3-SCO; NO sorption; IR spectroscopy
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IR studies of Fe modified ZSM-5 zeolites of diverse mesopore topologies in the terms of their catalytic performance in NH3-SCR and NH3-SCO processes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 179, December 2015, Pages 589–598
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us