Oxidation of NH[sub 3] over YBa[sub 2]Cu[sub 3]O[sub 7](123) oxide systems
Journal Article
·
· Journal of Catalysis; (United States)
- Indian Inst. of Science, Bangalore (India)
A temperature-programmed desorption study showed that the activation energy of oxygen desorption from YBa[sub 2]Cu[sub 3]O[sub 7[minus]x] (x = 0.05), PrBa[sub 2]Cu[sub 3]O[sub 7[minus]x] (x = 0.02), and YBa[sub 2]Cu[sub 2]CoO[sub 7+x] (x = 0.26) were 28.2, 26.4, and 22.3 kcal/mole, respectively. Anaerobic oxidation of NH[sub 3] over these oxide systems shows the formation of H[sub 2]O, N[sub 2], and NO transforming the oxides to tetragonal phases. Aerobic oxidation of NH[sub 3] is NO specific over all the three oxide catalysts. The Co-substituted YBa[sub 2]Cu[sub 2] CoO[sub 7+x] was the most reactive and stable oxide in this family; the lower oxygen desorption energy and higher reactivity are suggested to be due to the presence of holes in the form Co[sup 4+]O[sup 2[minus]] [r reversible] Co[sup 3+]O[sup [minus]]. The conversion of NH[sub 3] to NO was nearly 100% above 400 C when the ammonia flow rates were 10 [mu]mole/cm[sup 2]s over 0.3 g of the YBa[sub 2]Cu[sub 2]CoO[sub 7+x] catalyst.
- OSTI ID:
- 7017439
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 135:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
AMMONIA
BARIUM COMPOUNDS
BARIUM OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
COBALT OXIDES
CONTROL
COPPER COMPOUNDS
COPPER OXIDES
DESORPTION
ELEMENTS
ENERGY
HYDRIDES
HYDROGEN COMPOUNDS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
NONMETALS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
RARE EARTH COMPOUNDS
SORPTION
SYNTHESIS
TEMPERATURE CONTROL
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
AMMONIA
BARIUM COMPOUNDS
BARIUM OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
COBALT OXIDES
CONTROL
COPPER COMPOUNDS
COPPER OXIDES
DESORPTION
ELEMENTS
ENERGY
HYDRIDES
HYDROGEN COMPOUNDS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
NONMETALS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
RARE EARTH COMPOUNDS
SORPTION
SYNTHESIS
TEMPERATURE CONTROL
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES