Verfahren zur Regeneration von Katalysatoren

摘要

A hydrocarbon cracking catalyst having coke deposits thereon is regenerated by the combustion of the deposits in a regenerator 2 having a lower combustion zone 12 and an upper reducing zone 14. A mixture of oxygen and an inert gas (e.g. nitrogen or carbon dioxide) is introduced into the combustion zone 12 through a distributor 18. The combustion zone 12 is at least 24% by volume of the total flow rate of all gases into the zone 12. At least part of the coke is combusted. In addition nitrogen in the coke is converted to nitrogen oxides (NOx). A substantially oxygen-free combustion gas comprising carbon dioxide, nitrogen oxides and at least 1% by volume of carbon monoxide flows into the reducing zone 14 with the result that at least part of the nitrogen oxides are reduced to nitrogen.