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Analysis of pt/sno(sub x) during catalysis of co oxidation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Sermon, Paul A. Self, Valerie A. Barrett, E. P. S. |
| Copyright Year | 1990 |
| Description | Temperature-programmed reduction using 6kPaH2 suggests that a sample consisting of 3 percent Pt supported directly on SnO2 is, under conditions of catalysis of CO oxidation used here, best represented as 3 percent Pt/SnO sub x, since the support is likely to partially reduced, probably in the vicinity of the metal/oxide interface. Catalytic measurements at 421 to 424 K show that this 3 percent Pt/SnO sub x is significantly more active per unit area of Pt than 6 percent Pt/SiO2 in catalyzing the oxidation of CO. In situ micro-FTIR reveals that while the latter has predominantly linearly bound CO on the surface under reaction conditions, the Pt/SnO sub x also has a species absorbing at 2168 cm(exp -1) which may be CO upon Pt in a positive oxidation state or weakly chemisorbed CO on zero-valent Pt. This may be directly involved in the low temperature oxidation of CO on the Pt/SnO sub x, since being weakly held the activation energy for its surface diffusion to the metal/oxide interface will be low; such mobile species could allow the high rates of surface transport and an increase in the fraction of the surface over which the CO oxidation occurs. FTIR also reveals carbonate-type species on the P/SnO sub c surface. |
| File Size | 187466 |
| Page Count | 4 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900015291 |
| Archival Resource Key | ark:/13960/t6935r30m |
| Language | English |
| Publisher Date | 1990-06-01 |
| Access Restriction | Open |
| Subject Keyword | Inorganic And Physical Chemistry Chemisorption Catalytic Activity Infrared Spectra Reduction Chemistry Tin Oxides Platinum Surface Reactions Oxidation Catalysis Carbon Monoxide Diffusion Activation Energy Low Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
