Effect of indium in trimetallic Pt/Al2O3SnIn―Cl naphtha-reforming catalysts

Trimetallic Pt/Al2 O3 SnIn-Cl naphtha-reforming catalysts were characterized by 119 Sn Mössbauer spectroscopy, TPR, CO chemisorption, FTIR of adsorbed CO and NH3 -TPD. TPR traces indicate that indium facilitates tin reduction and strongly interacts with platinum as well. 119 Sn Mössbauer spectroscop...

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Bibliographic Details
Published in:Journal of catalysis 2010-06, Vol.272 (2), p.275-286
Main Authors: JAHEL, Ali, AVENIER, Priscilla, LACOMBE, Sylvie, OLIVIER-FOURCADE, Josette, JUMAS, Jean-Claude
Format: Article
Language:English
Subjects:
Carbon monoxide
Catalysis
Catalysts
Chemistry
Exact sciences and technology
General and physical chemistry
Indium
Spectrum analysis
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Trimetallic Pt/Al2 O3 SnIn-Cl naphtha-reforming catalysts were characterized by 119 Sn Mössbauer spectroscopy, TPR, CO chemisorption, FTIR of adsorbed CO and NH3 -TPD. TPR traces indicate that indium facilitates tin reduction and strongly interacts with platinum as well. 119 Sn Mössbauer spectroscopy results show that addition of even small amount of In (0.06wt.%) leads to the formation of a Pt3 Sn alloy. At higher indium loadings, higher amounts of Pt x Sn alloys of almost equal Pt and Sn atomic concentrations were detected. Indium also decreases the overall CO chemisorption capacity and provokes a modification of Pt electronic properties at the highest In loadings. A decrease in the acidity of the support in trimetallic catalysts is also observed by NH3 -TPD upon indium addition. These results correlate well with those from n-heptane-reforming reaction, showing that indium decreases catalyst's overall conversion and selectivity to C1 and C3 -C4 paraffins and increases isomerization selectivity. [PUBLICATION ABSTRACT]
ISSN:0021-9517
1090-2694
DOI:10.1016/j.jcat.2010.04.007