Reducing NO.sub.x emissions with group IIIB compounds

Details Reducing NO.sub.x emissions with group IIIB compounds Reducing NO.sub.x emissions with group IIIB compounds

1989-12-28

1991-06-04

McFarlane, Anthony

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208113, 208 52CT, 208149, 423239, C10G 1118

Patent

active

050211463

ABSTRACT:
A process for regeneration of cracking catalyst while minimizing NO.sub.x emissions is disclosed. A Group IIIB based DeNO.sub.x additive is present in an amount and in a form which reduces NO.sub.x emissions. Relatively small amounts of lanthanum or yttrium oxides, or lanthanum titanate, preferably impregnated on a separate support are effective to reduce NO.sub.x produced in the regenerator. The additive converts NO.sub.x to nitrogen even when Pt CO combustion promoter and some excess oxygen are present in the regenerator.

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