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A process for regenerating a dehydrogenation catalyst comprises the steps (a)-(f):(a) flushing with inert gas at a pressure of from 0.5 to 2.0 bar and a gas hourly velocity of from 1000 to 50 000 h?1;(b) passing an oxygen-containing gas mixture comprising an inert gas through the catalyst at a press

A process for regenerating a dehydrogenation catalyst comprises the steps (a)-(f):(a) flushing with inert gas at a pressure of from 0.5 to 2.0 bar and a gas hourly velocity of from 1000 to 50 000 h?1;(b) passing an oxygen-containing gas mixture comprising an inert gas through the catalyst at a pressure of from 2 to 20 bar and a gas hourly velocity of from 1000 to 50 000 h?1 for from 0.25 to 24 hours while increasing the oxygen concentration stepwise or continuously from an initial value of from 0.01 to 1% by volume of O2 to a final value of from 10 to 25% by volume of O2;(c) optionally passing an oxygen-containing gas mixture comprising an inert gas through the catalyst at a pressure of from 0.5 to 20 bar and a gas hourly velocity of from 10 to 500 h?1 for from 0.25 to 100 h, with the oxygen concentration being from 10 to 25% by volume of O2;(d) optionally changing the pressure repeatedly, rapidly and in opposite directions by a factor of from 2 to 20 within the range from 0.5 to 20 bar;(e) flushing with an inert gas;(f) activating the catalyst by means of hydrogen; where at least one of the steps (c) or (d) is carried out and the entire regeneration process is carried out at from 300 to 800° C.

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1. A process for regenerating a dehydrogenation catalyst, wherein the dehydrogenation catalyst comprises a metal oxide selected from the group consisting of zirconium dioxide, aluminum oxide, silicon dioxide, titanium dioxide, magnesium oxide, lanthanum oxide and cerium oxide, and platinum and/or pa

1. A process for regenerating a dehydrogenation catalyst, wherein the dehydrogenation catalyst comprises a metal oxide selected from the group consisting of zirconium dioxide, aluminum oxide, silicon dioxide, titanium dioxide, magnesium oxide, lanthanum oxide and cerium oxide, and platinum and/or palladium, which comprises the steps (a)-(f):(a) flushing with inert gas at a pressure of from 0.5 to 2.0 bar and a gas hourly velocity of from 1000 to 50000 h?1; (b) passing an oxygen-containing gas mixture comprising an inert gas through the catalyst at a pressure of from 2 to 20 bar and a gas hourly velocity of from 1000 to 50 000 h?1 for from 0.25 to 24 hours while increasing the oxygen concentration stepwise or continuously from an initial value of from 0.01 to 1% by volume of O2 to a final value of from 10 to 25% by volume of O2; (c) optionally passing an oxygen-containing gas mixture comprising an inert gas through the catalyst at a pressure of from 0.5 to 20 bar and a gas hourly velocity of from 10 to 500 h?1 for from 0.25 to 100 h, with the oxygen concentration being from 10 to 25% by volume of O2; (d) optionally changing the pressure repeatedly, rapidly and in opposite directions by a factor of from 2 to 20 within the range from 0.5 to 20 bar; (e) flushing with an inert gas; (f) activating the catalyst by means of hydrogen; where at least one of the steps (c) or (d) is carried out and the entire regeneration process is carried out at from 300 to 800° C. 2. A process as claimed in claim 1, wherein the dehydrogenation catalyst to be regenerated is a porous catalyst.3. A process as claimed in claim 1, wherein the dehydrogenation catalyst comprises zirconium dioxide and/or silicon dioxide.4. A process as claimed in claim 3, wherein the dehydrogenation catalyst comprises at least one element of main group I or II, at least one element of main group III or IV and at least one element of transition group III including the lanthanides and actinides.5. A process as claimed in claim 3, wherein the dehydrogenation catalyst comprises cesium and/or potassium.6. A process as claimed in claim 3, wherein the dehydrogenation catalyst comprises lanthanum and/or cerium.7. A process as claimed in claim 3, wherein the dehydrogenation catalyst comprises tin.8. A process as claimed in claim 3, wherein the dehydrogenation catalyst has a bimodal pore radius distribution in which from 70 to 100% of the pore volume is made up by pores having a pore diameter of less than 20 nm or in the range from 40 to 5000 nm.9. A process as claimed in claim 1, wherein step (a) is carried out over a period of from 0.1 to 24 hours.10. A process as claimed in claim 1, wherein flushing in step (a) is continued until the flushing gas contains essentially no traces of dehydrogenation product and hydrogen.11. A process as claimed in claim 1, wherein the gas hourly velocity in step (a) is from 2000 to 20000 h?1.12. A process as claimed in claim 1, wherein the pressure in step (a) is from 1 to 1.5 bar.13. A process as claimed in claim 1, wherein the oxygen-containing gas mixture used in step (b) is diluted air.14. A process as claimed in claim 1, wherein the oxygen-containing gas mixture in step (b) contains from 10 to 90% by volume of steam.15. A process as claimed in claim 1, wherein the pressure in step (b) is from 3 to 7 bar.16. A process as claimed in claim 1, wherein the oxygen-containing gas mixture used in step (c) is air which may optionally further comprise steam.17. A process as claimed in claim 1, wherein the gas hourly velocity in step (c) is from 20 to 100 h?1.18. A process as claimed in claim 1, wherein in step (d), the pressure is changed from 2 to 20 times by a factor of from 2 to 5 in the range from 1 to 5 bar.19. A process as claimed in claim 1, wherein step (c) is carried out over a period of from 0.25 to 5 hours and step (d) is carried out.20. A process as claimed in claim 1, wherein step (c) is carried out over a period of from 20 to 100 hours and step (d) is not carried out.