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Searching for the active sites of Co-H-MFI catalyst for the selective catalytic reduction of NO by methane: A FT-IR in situ and operando study

Paper ID Volume ID Publish Year Pages File Format Full-Text
48984 46536 2007 7 PDF Available
Title
Searching for the active sites of Co-H-MFI catalyst for the selective catalytic reduction of NO by methane: A FT-IR in situ and operando study
Abstract

A Co-H-MFI sample has been studied through FT-IR spectroscopy of in situ adsorption and co-adsorption of probe molecules (o-toluonitrile, CO, NO) and has been tested in the CH4-SCR process under IR operando conditions. The o-toluonitrile (oTN) adsorption and the oTN and NO co-adsorption, show that both Co2+ and Co3+ species are present on the catalyst surface. Co3+ species are located inside the zeolitic channels while Co2+ ions are distributed both at the external and at the internal surfaces. The operando study show the activity of Co3+ species in the reaction. The existence of three parallel reactions, CH4-SCR, CH4 total oxidation and NO to NO2 oxidation, has been confirmed. Isocyanate species and nitrate-like species appear to be intermediates of CH4-SCR and NO oxidation, respectively. A mechanism for CH4-SCR has been proposed. Co2+ substitutional sites, very evident and predominant in the catalyst, which are very hardly reducible, seem not to play a key role in the SCR process.

Keywords
NOx reduction; Co-MFI zeolite; Operando IR spectroscopy; Nitrile adsorption; NO adsorption; Selective catalytic reduction
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Searching for the active sites of Co-H-MFI catalyst for the selective catalytic reduction of NO by methane: A FT-IR in situ and operando study
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 71, Issues 3–4, 15 February 2007, Pages 216–222
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