초록 ▼

A process for regeneration of cracking catalyst while minimizing NOx emissions is disclosed. A Group IIIB based DeNOx additive is present in an amount and in a form which reduces NOx emissions. Relatively small amounts of lanthanum or yttrium oxides, or lanthanum titanate, preferably impregnated on

A process for regeneration of cracking catalyst while minimizing NOx emissions is disclosed. A Group IIIB based DeNOx additive is present in an amount and in a form which reduces NOx emissions. Relatively small amounts of lanthanum or yttrium oxides, or lanthanum titanate, preferably impregnated on a separate support are effective to reduce NOx produced in the regenerator. The additive converts NOx to nitrogen even when Pt CO combustion promoter and some excess oxygen are present in the regenerator.

대표청구항 ▼

In a process for the catalytic cracking of a heavy hydrocarbon feed containing nitrogen compounds by contact with a circulating inventory of catalytic cracking catalyst to produce catalytically cracked products and spent catalyst containing coke comprising nitrogen compounds, and wherein said spent

In a process for the catalytic cracking of a heavy hydrocarbon feed containing nitrogen compounds by contact with a circulating inventory of catalytic cracking catalyst to produce catalytically cracked products and spent catalyst containing coke comprising nitrogen compounds, and wherein said spent catalyst is regenerated by contact with oxygen or an oxygen-containing gas in a catalyst regeneration zone operating at catalyst regeneration conditions to produce hot regenerated catalyst which is recycled to catalytically crack the heavy feed and said catalyst regeneration zone produces a flue gas comprising CO, CO2 and oxides of nitrogen (NOx), the improvement comprising reducing the NOx content of the flue gas by adding to the circulating catalyst inventory an additive comprising discrete particles comprising oxides of Group IIIB elements, exclusive of Group III elements which are ion exchanged or impregnated into said cracking catalyst, said additive being added in an amount sufficient to reduce the production of NOx relative to operation without said additive.