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Porous clay heterostructures (PCHs) intercalated with silica-titania pillars and modified with transition metals as catalysts for the DeNOx process

Paper ID Volume ID Publish Year Pages File Format Full-Text
47758 46481 2009 11 PDF Available
Title
Porous clay heterostructures (PCHs) intercalated with silica-titania pillars and modified with transition metals as catalysts for the DeNOx process
Abstract

Porous clay heterostructures (PCHs) intercalated with silica as well as silica-titania pillars were obtained from natural montmorillonite. The PCH samples were modified with copper or iron by an ion-exchange method. Detailed characterization of the obtained materials included: chemical (EPMA), structural (XRD) and textural (BET) analysis, determination of coordination and aggregation of transition metal species (UV–vis-DRS, EPR) as well as analysis of surface acidity (FT-IR, NH3-TPD). Titanium incorporated into the silica pillars was present mainly in the form of separated cations. Small contribution of polymeric titanium oxides was detected only for the samples with the higher Ti loading. Titanium incorporated into the silica pillars significantly increased the surface acidity of the PCH materials. Transition metals (Cu, Fe) deposited on the surface of PCHs were present mainly in the form of isolated cations and oligomeric metal oxide species. Ti-containing PCHs modified with transition metals was found to be active and selective catalysts of the DeNOx process. The Cu- and Fe-modified catalysts effectively operated in a broad temperature range of 350–550 °C and 300–500 °C, respectively. The PCH based catalysts were only slightly deactivated by water vapour and SO2.

Keywords
Porous clay heterostructures (PCHs); Montmorillonite; Silica-titania pillars; DeNOx; Ammonia
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Porous clay heterostructures (PCHs) intercalated with silica-titania pillars and modified with transition metals as catalysts for the DeNOx process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 91, Issues 1–2, 7 September 2009, Pages 449–459
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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