| abstract |
The invention relates to a method for the oxidative dehydrogenation of n-butenes into butadiene, comprising at least two production steps (i) and at least one regeneration step (ii), in which method (i) in a production step a starting gas mixture containing n-butenes is mixed with a gas containing oxygen and, in a fixed-bed reactor, is brought in contact with a multi-metal oxide catalyst, which is arranged in a catalyst fixed bed and contains at least molybdenum and one additional metal in a catalyst fixed bed, and (ii) in a regeneration step the multi-metal oxide catalyst is regenerated by conducting a regeneration gas mixture containing oxygen over the catalyst fixed bed and burning off the carbon deposited on the catalyst, a regeneration step (ii) being performed between two production steps (i), characterized in that the at least two production steps (i) are performed at a temperature of at least 350 °C and the at least one regeneration step (ii) is performed at a temperature that lies at most 50 °C above the temperature at which the preceding production step (i) was performed. |