THE METAL-CATALYZED DECOMPOSITION OF NITROUS OXIDE (I). DECOMPOSITION ON PURE SILVER, SILVER–GOLD, AND SILVER–CALCIUM ALLOYS

1959 ◽  
Vol 37 (3) ◽  
pp. 583-589 ◽  
Author(s):  
Kenneth E. Hayes
Keyword(s):  
Activation Energy ◽  
Nitrous Oxide ◽  
Work Function ◽  
Gold Alloy ◽  
Calcium Content ◽  
Pure Silver ◽  
Pure Metals ◽  
Metal Catalyzed ◽  
Silver Silver ◽  
Decomposition Of Nitrous Oxide

The decomposition of nitrous oxide on silver, a silver–1.14% gold alloy, and a series of silver–calcium alloys has been studied. On all of these catalysts the initialrate of decomposition is proportional to the nitrous oxide pressure. The activation energy for pure metals, including platinum and gold, is proportional to the work function. For the silver–calcium alloys the activation energy falls rapidly with increasing calcium content, suggesting that the work function of these alloys falls with increasing calcium content.

The decomposition of nitrous oxide catalysed by palladium-gold alloy wires

1966 ◽  
Vol 294 (1436) ◽  
pp. 1-19 ◽  
Keyword(s):  
Activation Energy ◽  
Nitrous Oxide ◽  
Fermi Level ◽  
Apparent Activation Energy ◽  
Frequency Factor ◽  
Kcal Mole ◽  
Dissociative Chemisorption ◽  
Retarding Effect ◽  
Effect Of Oxygen ◽  
Decomposition Of Nitrous Oxide

The rate of decomposition of nitrous oxide has been examined by pressure measurements, at temperatures between 500 and 900 °C and pressures between 10 -2 and 1 torr. The reaction is first order, but shows retardation by oxygen, but not nitrogen. Over the range of alloys, from Pd to nearly 40 at. % Pd, the velocity at 650 °C falls by a factor of 104, the apparent activation energy falls from 30 to 13 kcal/mole, and the retarding effect of oxygen falls to zero. Over this range of alloys the Fermi level which lies in the d band hardly changes but the concentration of the d band vacancies falls to zero. Over the range of alloys from 40 at. % Pd to Au the velocity at 650 °C remains constant but the apparent activation energy and frequency factor, which show an abrupt increase at 40 at. % Pd, show a continuous fall. The retarding effect of oxygen remains zero. In this range the Fermi level has entered the s band and increases to Au. A steady state treatment of an irreversible dissociative chemisorption of nitrous oxide, together with an oxygen chemisorption equilibrium, yields an equation for the velocity in quantitative agreement with the results found. It is also possible to account for the increase in apparent activation energy with oxygen coverage of the surface. The heat of adsorption of oxygen is derived as 32-2±2 kcal/mole, and the activation energy for chemisorption of nitrous oxide as 12-7 ±0-5 kcal/mole.

REACTION OF OXYGEN ATOMS WITH ACETALDEHYDE

1956 ◽  
Vol 34 (6) ◽  
pp. 775-784 ◽  
Author(s):  
R. J. Cvetanović
Keyword(s):  
Activation Energy ◽  
Nitrous Oxide ◽  
Room Temperature ◽  
Primary Process ◽  
Kcal Mole ◽  
Decomposition Of Nitrous Oxide ◽  
Oxygen Atoms

Reaction of oxygen atoms, produced by mercury photosensitized decomposition of nitrous oxide, with acetaldehyde has been studied at room temperature. The major products of the reaction are water and biacetyl and the only primary process appears to be[Formula: see text]followed by[Formula: see text]and[Formula: see text]At room temperature oxygen atoms react with acetaldehyde 0.7 ± 0.1 times as fast as with ethylene, so that the activation energy of reaction [1] is likely to be close to 3 kcal./mole.

REACTION OF OXYGEN ATOMS WITH TOLUENE

1961 ◽  
Vol 39 (12) ◽  
pp. 2444-2451 ◽  
Author(s):  
G. R. H. Jones ◽  
R. J. Cvetanović
Keyword(s):  
Activation Energy ◽  
Nitrous Oxide ◽  
Room Temperature ◽  
Kcal Mole ◽  
General Similarity ◽  
Decomposition Of Nitrous Oxide ◽  
Oxygen Atoms

The reaction of toluene with oxygen atoms produced by mercury photosensitized decomposition of nitrous oxide has been studied at room temperature. The reaction shows a general similarity to the corresponding reaction of benzene. Relative rates have been determined at 120 and 220 °C and the activation energy estimated at close to 4 kcal/mole.

Decomposition of nitrous oxide in excess oxygen over Co- and Cu-exchanged MFI zeolites

1996 ◽  
Vol 38 (1-2) ◽  
pp. 27-32 ◽  
Author(s):  
Consuelo Montes de Correa ◽  
Aida Luz Villa ◽  
Mauren Zapata
Keyword(s):  
Nitrous Oxide ◽  
Excess Oxygen ◽  
Mfi Zeolites ◽  
Decomposition Of Nitrous Oxide
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