| http://www.w3.org/ns/prov#value | - The metal compounds to be used according to the invention as the catalyst can be used in the form of inorganic or organic compounds, for example in the form of their oxides, hydrated oxides, hydroxides, carbonates, nitrates, sulphides, sulphites, sulphates, phosphates, borates, plumbates, chromates, manganates, formates, acetates, propionates, valerates, oxalates, benzoates, salicyclates, tartrate
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