Sharma, L. D. ; Kumar, Manoj ; Saxena, A. K. ; Rawat, D. S. ; Prasada Rao, T. S. R. (1998) The determination of accessible Pt metal fraction in Pt-Sn/Al2O3 reforming catalyst Applied Catalysis A: General, 168 (2). pp. 251-259. ISSN 0926-860X
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09268...
Related URL: http://dx.doi.org/10.1016/S0926-860X(97)00356-6
Abstract
An attempt has been made to provide a simple method for the determination of accessible Pt metal fraction in Pt-Sn/Al2O3 catalyst. The complications in Pt-Sn/Al2O3 system arise mainly due to uncertainties involved in the oxidation states of tin: Sn0, Sn2+ and Sn4+ in the reduced catalyst. H2, O2 chemisorption/titrations originally applied to Pt/Al2O3 were extended to the Pt–Sn/Al2O3 system. Two oxygen titration cycles OT1 and OT2 at room temperature were carried out using a dynamic pulse flow technique. Only part of the total Sn in the catalyst is reduced to Sn0(15%), which contributes to oxygen uptake. While OT1 is a linear function of the Sn content in the catalyst, the second oxygen titration OT2 gives the accessible Pt metal fraction only. It has been concluded that oxygen chemisorption/titrations at temperatures higher than ambient under dynamic conditions are not reliable for the determination of metal dispersions.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 36094 |
| Deposited On: | 19 Apr 2011 07:32 |
| Last Modified: | 19 Apr 2011 09:52 |
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