14 Faraday Molybdenum

The decomposition of ammonia on the surface of platinum takes place at a speed which is inversely proportional to the pressure of the hydrogen present. The combined influence of the two terms E and A produces an apparent heat of activation of more than 100,000 calories. This is in striking contrast with the value of E true, 39,000 calories for the unretarded reaction on the surface of tungsten. The decomposition of ammonia on molybdenum is of zero order, but retarded by nitrogen the value of E according to Burk is 53,200 calories. Kunsman finds 32,000 calories Trans. Faraday Soc., 1922, 17, 621. 

The Faraday collector F is supported on chromel arms to which molybdenum points are attached for pivots. A small nickel rod, at the lower end of a 1-mm molybdenum wire attached to the lower chromel arm, serves as a magnetic control for rotation of the collector about an axis which lies in the face of the crystal and intersects the incident beam at an angle of 90°. 

The catalytic activity of co-ordination compounds in oxidations continues to be examined and, together with the Faraday Society Discussion, other aspects of this area of investigation have been the subject of recent reviews. Redox reactions involving bipyridyl and u-phenanthroline complexes of transition metals have been discussed and catalytic oxidations of complexes of manganese, cobalt, copper, and palladium have also been surveyed. Reviews are also available of ruthenium ammine chemistry, and redox reactions involving molybdenum complexes, together with an account of catalase and peroxidase reactivity of copper(ii) complexes. ... 

Fig. 7.3. Internally pressured cell for magnetic susceptibility measurements of fluid selenium by the Faraday method (Freyland and Cutler, 1980). The sealed quartz capsule containing the sample is mechanically supported by the surrounding molybdenum pressure cell.

Sorption by Molybdenum Sulphide Catalysts J,Chem. Soc. Faraday I, 2A (1980) 1585-1598. 

Ammonia oxidation to nitrous oxide Iron oxide/bismuth oxide [Von Nagel, Zeit Electrochem 3 (1980) 754] Iron oxide/bismuth oxide/molybdenum oxide [Zawadski, Tram Faraday Soc Disc, No. 8 (1950) 140]... 

Takenaka S, Tanaka T, Funabiki T, Yoshida S (1998) Effect of alkali-metal ion addition to silica-supported molybdenum oxide on photocatalysis photooxidation of propane and propene, and photo-assisted metathesis of propene. J Chem Soc Faraday Trans 94 695-700... 

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