Species active in the selective catalytic reduction of no with iso-butane on iron-exchanged ZSM-5 zeolites
Fe-ZSM-5 catalysts were prepared by ion exchange in aqueous medium or in the solid state and tested in the catalytic reduction of NO with iso-butane. X-ray powder diffraction (XRD), atomic absorption spectroscopy (AAS), electron paramagnetic resonance spectroscopy (EPR), X-ray absorption spectroscopy (XANES, EXAFS), temperature-programmed reduction by H2 (H2-TPR) and Mössbauer spectroscopy (MÖS-S) were used for sample characterisation. Irrespective of the method used in catalyst preparation, EPR, XANES and MÖS-S showed Fe atoms in the oxidation state of 3+. MÖS-S and H2-TPR data on Fe-ZSM-5 prepared by ion exchange in the solid state allowed quantification of a lower hematite (Fe2O3) concentration and a higher proportion of Fe cations than samples prepared in an aqueous medium. In all the catalysts studied these Fe cations were the active sites in the reduction of NO to N2 and in the oxidation of iso-butane. It is further suggested that coordination of Fe species is another important aspect to be considered in their behaviour.
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Digital revista |
| Language: | English |
| Published: |
Brazilian Society of Chemical Engineering
2005
|
| Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322005000300003 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| id |
oai:scielo:S0104-66322005000300003 |
|---|---|
| record_format |
ojs |
| spelling |
oai:scielo:S0104-663220050003000032005-09-26Species active in the selective catalytic reduction of no with iso-butane on iron-exchanged ZSM-5 zeolitesBatista,M. S.Wallau,M.Urquieta-González,E. A. NO reduction Fe/ZSM-5 catalysts Iso-butane Mössbauer spectroscopy XANES/EXAFS Fe-ZSM-5 catalysts were prepared by ion exchange in aqueous medium or in the solid state and tested in the catalytic reduction of NO with iso-butane. X-ray powder diffraction (XRD), atomic absorption spectroscopy (AAS), electron paramagnetic resonance spectroscopy (EPR), X-ray absorption spectroscopy (XANES, EXAFS), temperature-programmed reduction by H2 (H2-TPR) and Mössbauer spectroscopy (MÖS-S) were used for sample characterisation. Irrespective of the method used in catalyst preparation, EPR, XANES and MÖS-S showed Fe atoms in the oxidation state of 3+. MÖS-S and H2-TPR data on Fe-ZSM-5 prepared by ion exchange in the solid state allowed quantification of a lower hematite (Fe2O3) concentration and a higher proportion of Fe cations than samples prepared in an aqueous medium. In all the catalysts studied these Fe cations were the active sites in the reduction of NO to N2 and in the oxidation of iso-butane. It is further suggested that coordination of Fe species is another important aspect to be considered in their behaviour.info:eu-repo/semantics/openAccessBrazilian Society of Chemical EngineeringBrazilian Journal of Chemical Engineering v.22 n.3 20052005-09-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322005000300003en10.1590/S0104-66322005000300003 |
| institution |
SCIELO |
| collection |
OJS |
| country |
Brasil |
| countrycode |
BR |
| component |
Revista |
| access |
En linea |
| databasecode |
rev-scielo-br |
| tag |
revista |
| region |
America del Sur |
| libraryname |
SciELO |
| language |
English |
| format |
Digital |
| author |
Batista,M. S. Wallau,M. Urquieta-González,E. A. |
| spellingShingle |
Batista,M. S. Wallau,M. Urquieta-González,E. A. Species active in the selective catalytic reduction of no with iso-butane on iron-exchanged ZSM-5 zeolites |
| author_facet |
Batista,M. S. Wallau,M. Urquieta-González,E. A. |
| author_sort |
Batista,M. S. |
| title |
Species active in the selective catalytic reduction of no with iso-butane on iron-exchanged ZSM-5 zeolites |
| title_short |
Species active in the selective catalytic reduction of no with iso-butane on iron-exchanged ZSM-5 zeolites |
| title_full |
Species active in the selective catalytic reduction of no with iso-butane on iron-exchanged ZSM-5 zeolites |
| title_fullStr |
Species active in the selective catalytic reduction of no with iso-butane on iron-exchanged ZSM-5 zeolites |
| title_full_unstemmed |
Species active in the selective catalytic reduction of no with iso-butane on iron-exchanged ZSM-5 zeolites |
| title_sort |
species active in the selective catalytic reduction of no with iso-butane on iron-exchanged zsm-5 zeolites |
| description |
Fe-ZSM-5 catalysts were prepared by ion exchange in aqueous medium or in the solid state and tested in the catalytic reduction of NO with iso-butane. X-ray powder diffraction (XRD), atomic absorption spectroscopy (AAS), electron paramagnetic resonance spectroscopy (EPR), X-ray absorption spectroscopy (XANES, EXAFS), temperature-programmed reduction by H2 (H2-TPR) and Mössbauer spectroscopy (MÖS-S) were used for sample characterisation. Irrespective of the method used in catalyst preparation, EPR, XANES and MÖS-S showed Fe atoms in the oxidation state of 3+. MÖS-S and H2-TPR data on Fe-ZSM-5 prepared by ion exchange in the solid state allowed quantification of a lower hematite (Fe2O3) concentration and a higher proportion of Fe cations than samples prepared in an aqueous medium. In all the catalysts studied these Fe cations were the active sites in the reduction of NO to N2 and in the oxidation of iso-butane. It is further suggested that coordination of Fe species is another important aspect to be considered in their behaviour. |
| publisher |
Brazilian Society of Chemical Engineering |
| publishDate |
2005 |
| url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322005000300003 |
| work_keys_str_mv |
AT batistams speciesactiveintheselectivecatalyticreductionofnowithisobutaneonironexchangedzsm5zeolites AT wallaum speciesactiveintheselectivecatalyticreductionofnowithisobutaneonironexchangedzsm5zeolites AT urquietagonzalezea speciesactiveintheselectivecatalyticreductionofnowithisobutaneonironexchangedzsm5zeolites |
| _version_ |
1756411182774747136 |