The role of alkali-metal promotion on CO oxidation over PdO/SnO2 catalysts
Sol-gel prepared PdO/SnO2 and Na-PdO/SnO2 catalysts were investigated by X-ray photoelectron spectroscopy (XPS), diffuse reflectance IR (DRIFTS), temperature-programmed reaction spectroscopy (TPRS) and impulse techniques. Alkali-metal promotion was observed to enhance CO oxidation rate and decreases...
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| Veröffentlicht in: | Applied catalysis. A, General General, 2006-01, Vol.299, p.84-94 |
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| creator | MIRKELAMOGLU, Burcu KARAKAS, Gurkan |
| description | Sol-gel prepared PdO/SnO2 and Na-PdO/SnO2 catalysts were investigated by X-ray photoelectron spectroscopy (XPS), diffuse reflectance IR (DRIFTS), temperature-programmed reaction spectroscopy (TPRS) and impulse techniques. Alkali-metal promotion was observed to enhance CO oxidation rate and decreases light-off temperatures of PdO/SnO2. XPS analysis revealed that alkali-metal promotion resulted in the segregation of Pd atoms and promoted the oxygen storage capacity of the catalysts. The presence of super-oxide species was also observed over Na-PdO/SnO2 catalyst and the formation of a relatively stable ternary oxide of sodium and palladium (NaxPd3O4) was postulated. Surface titration experiments utilizing pulse technique showed that alkali-metal-promoted sample was able to preserve part of its CO oxidation activity even after reduction pre-treatment and that oxygen diffusion from bulk of the catalyst effectively promoted the activity of Na-PdO/SnO2 sample at 150 deg C. |
| doi_str_mv | 10.1016/j.apcata.2005.10.003 |
| format | Article |
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Alkali-metal promotion was observed to enhance CO oxidation rate and decreases light-off temperatures of PdO/SnO2. XPS analysis revealed that alkali-metal promotion resulted in the segregation of Pd atoms and promoted the oxygen storage capacity of the catalysts. The presence of super-oxide species was also observed over Na-PdO/SnO2 catalyst and the formation of a relatively stable ternary oxide of sodium and palladium (NaxPd3O4) was postulated. 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Surface titration experiments utilizing pulse technique showed that alkali-metal-promoted sample was able to preserve part of its CO oxidation activity even after reduction pre-treatment and that oxygen diffusion from bulk of the catalyst effectively promoted the activity of Na-PdO/SnO2 sample at 150 deg C.</description><subject>Catalysis</subject><subject>Chemistry</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Theory of reactions, general kinetics. Catalysis. 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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Catalysis Chemistry Exact sciences and technology General and physical chemistry Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
| title | The role of alkali-metal promotion on CO oxidation over PdO/SnO2 catalysts |
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