| http://www.w3.org/ns/prov#value | - I Also known is a method for preparing monoand diolefinic hydrocarbons by the oxidative dehydrogenation of paraffin hydrocarbons at a temperature from 400 to 700C and molar ratio of oxygen to the paraffin hydrocarbon of 0.1 3, in the presence of an inert diluent, e.g. water vapor, nitrogen, argon, helium or their mixtures, on a catalyst, which is an oxy compound of molybdenum and/or tungsten, and
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