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Comparison study of titania pillared interlayered clays and porous clay heterostructures modified with copper and iron as catalysts of the DeNOx process
Abstract Natural montmorillonite was used as a raw material for the preparation of titania pillared clays (Ti-PILC) and porous clay heterostructures (Ti-PCH). Ti-PILC was produced by direct exchange of interlayer sodium cations in montmorillonite (sodium form) for titanium oligocations. Ti-PCH was obtained by the surfactant directed method. Tetraethylorthosilicate and titanium isopropoxide were used as the source of silica and titania, respectively. Copper and iron were introduced to Ti-PILC and Ti-PCH by the ion exchange method. The obtained materials were characterized with respect to chemical composition (EPMA), structure (XRD) and texture (BET), coordination and aggregation of transition metal species (UV–vis-DRS) and surface acidity (FT-IR). Modified montmorillonites were found to be active and selective catalysts for the reduction of NO with ammonia (DeNOx process) and their catalytic performance depended on the type of support (Ti-PILC or Ti-PCH) as well as deposited transition metal (Cu or Fe) species.
Research Highlights ► Montmorillonites pillared with TiO2 or SiO2-TiO2 were tested as catalysts for DeNOx. ► Ti-PILC was obtained by intercalation of Ti-oligocations into clay interlayer space. ► Ti-PCH (clay pillared with SiO2-TiO2) was obtained by surfactant directed method. ► Ti-PILC and Ti-PCH modified with Cu and Fe were active catalysts of DeNOx process. ► The studies showed that DeNOx process proceeds according to Eley-Riedel mechanism.
Comparison study of titania pillared interlayered clays and porous clay heterostructures modified with copper and iron as catalysts of the DeNOx process
Abstract Natural montmorillonite was used as a raw material for the preparation of titania pillared clays (Ti-PILC) and porous clay heterostructures (Ti-PCH). Ti-PILC was produced by direct exchange of interlayer sodium cations in montmorillonite (sodium form) for titanium oligocations. Ti-PCH was obtained by the surfactant directed method. Tetraethylorthosilicate and titanium isopropoxide were used as the source of silica and titania, respectively. Copper and iron were introduced to Ti-PILC and Ti-PCH by the ion exchange method. The obtained materials were characterized with respect to chemical composition (EPMA), structure (XRD) and texture (BET), coordination and aggregation of transition metal species (UV–vis-DRS) and surface acidity (FT-IR). Modified montmorillonites were found to be active and selective catalysts for the reduction of NO with ammonia (DeNOx process) and their catalytic performance depended on the type of support (Ti-PILC or Ti-PCH) as well as deposited transition metal (Cu or Fe) species.
Research Highlights ► Montmorillonites pillared with TiO2 or SiO2-TiO2 were tested as catalysts for DeNOx. ► Ti-PILC was obtained by intercalation of Ti-oligocations into clay interlayer space. ► Ti-PCH (clay pillared with SiO2-TiO2) was obtained by surfactant directed method. ► Ti-PILC and Ti-PCH modified with Cu and Fe were active catalysts of DeNOx process. ► The studies showed that DeNOx process proceeds according to Eley-Riedel mechanism.
Comparison study of titania pillared interlayered clays and porous clay heterostructures modified with copper and iron as catalysts of the DeNOx process
Chmielarz, Lucjan (author) / Piwowarska, Zofia (author) / Kuśtrowski, Piotr (author) / Węgrzyn, Agnieszka (author) / Gil, Barbara (author) / Kowalczyk, Andrzej (author) / Dudek, Barbara (author) / Dziembaj, Roman (author) / Michalik, Marek (author)
Applied Clay Science ; 53 ; 164-173
2010-12-07
10 pages
Article (Journal)
Electronic Resource
English
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