| 摘要 |
A process for regeneration of cracking catalyst while minimizing NOx emissions is disclosed. A zinc-based DeNOx catalyst is present in an amount and in a form which reduces NOx emissions. Relatively small amounts of zinc oxides impregnated on a separate support having little or no cracking activity are preferred. The zinc NOx reduction catalyst can be a separate particle additive, or can be made in situ by adding a solution or dispersion of zinc or a compound thereof to the cracking unit, or to the hydrocarbon feed to the cracking unit.
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