Abstract
IN a recent publication1 attention has been directed to the critical concentration of silica required to give the maximum increase in the activity of molybdenum oxide catalysts used in the decomposition of hexane at 500°. A survey has now been made of the concentration required with a wide range of other promoters, and it is found that in the case of oxides of sodium, chromium, cerium, aluminium, barium, boron and thorium, the ratio of the number of atoms of these elements to 100 atoms of molybdenum is the same as that previously observed with silicon.
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