Preparation and characterization of alumina-supported Co and Ag/Co catalysts
The effect of silver addition as a promoter in alumina supported cobalt oxide catalysts is investigated in this study. The Co/Al2O3 and Ag/Co/Al2O3 catalysts were prepared by incipient wetness impregnation. The catalysts were characterized by inductively-coupled plasma spectrometry, X-ray diffraction (XRD), temperature programmed reduction with hydrogen (TPR-H2), Raman spectroscopy and nitrogen adsorption at 77 K. XDR and Raman Spectroscopy results indicated the presence of Co3O4 species. The peaks observed in the TPR-H2 patterns were attributed to the reduction of Ag2O, Co3O4 crystallites and Co+3, Co+2 species interacting with alumina. It is suggested that silver used as a promoter favors the reduction of cobalt, facilitating the formation of active Co0 sites.
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ABM, ABC, ABPol
2003
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oai:scielo:S1516-143920030004000192004-01-19Preparation and characterization of alumina-supported Co and Ag/Co catalystsSimionato,MarinaAssaf,Elisabete Moreira cobalt catalysts Ag-Co/Al2O3 The effect of silver addition as a promoter in alumina supported cobalt oxide catalysts is investigated in this study. The Co/Al2O3 and Ag/Co/Al2O3 catalysts were prepared by incipient wetness impregnation. The catalysts were characterized by inductively-coupled plasma spectrometry, X-ray diffraction (XRD), temperature programmed reduction with hydrogen (TPR-H2), Raman spectroscopy and nitrogen adsorption at 77 K. XDR and Raman Spectroscopy results indicated the presence of Co3O4 species. The peaks observed in the TPR-H2 patterns were attributed to the reduction of Ag2O, Co3O4 crystallites and Co+3, Co+2 species interacting with alumina. It is suggested that silver used as a promoter favors the reduction of cobalt, facilitating the formation of active Co0 sites.info:eu-repo/semantics/openAccessABM, ABC, ABPolMaterials Research v.6 n.4 20032003-12-01info:eu-repo/semantics/othertext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400019en10.1590/S1516-14392003000400019 |
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Simionato,Marina Assaf,Elisabete Moreira |
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Simionato,Marina Assaf,Elisabete Moreira Preparation and characterization of alumina-supported Co and Ag/Co catalysts |
| author_facet |
Simionato,Marina Assaf,Elisabete Moreira |
| author_sort |
Simionato,Marina |
| title |
Preparation and characterization of alumina-supported Co and Ag/Co catalysts |
| title_short |
Preparation and characterization of alumina-supported Co and Ag/Co catalysts |
| title_full |
Preparation and characterization of alumina-supported Co and Ag/Co catalysts |
| title_fullStr |
Preparation and characterization of alumina-supported Co and Ag/Co catalysts |
| title_full_unstemmed |
Preparation and characterization of alumina-supported Co and Ag/Co catalysts |
| title_sort |
preparation and characterization of alumina-supported co and ag/co catalysts |
| description |
The effect of silver addition as a promoter in alumina supported cobalt oxide catalysts is investigated in this study. The Co/Al2O3 and Ag/Co/Al2O3 catalysts were prepared by incipient wetness impregnation. The catalysts were characterized by inductively-coupled plasma spectrometry, X-ray diffraction (XRD), temperature programmed reduction with hydrogen (TPR-H2), Raman spectroscopy and nitrogen adsorption at 77 K. XDR and Raman Spectroscopy results indicated the presence of Co3O4 species. The peaks observed in the TPR-H2 patterns were attributed to the reduction of Ag2O, Co3O4 crystallites and Co+3, Co+2 species interacting with alumina. It is suggested that silver used as a promoter favors the reduction of cobalt, facilitating the formation of active Co0 sites. |
| publisher |
ABM, ABC, ABPol |
| publishDate |
2003 |
| url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000400019 |
| work_keys_str_mv |
AT simionatomarina preparationandcharacterizationofaluminasupportedcoandagcocatalysts AT assafelisabetemoreira preparationandcharacterizationofaluminasupportedcoandagcocatalysts |
| _version_ |
1756420288043548672 |