| http://www.w3.org/ns/prov#value | - C.The calcination time preferably comes to a few hours, for example 0.5 to 50 h, preferably 1 to 40 h, particularly preferably 1 to 30 h.The supported catalysts can be used as powders or mouldings and be separated from the reaction mixture e.g. by filtration, sedimentation or centrifuging.The present inventio
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