초록 ▼

The amount of NOx formed during regeneration of a cracking catalyst in the presence of a metallic carbon monoxide combustion catalyst is decreased without substantially adversely affecting the carbon monoxide combustion activity of the promoter by subjecting the combustion-promoting catalyst to stea

The amount of NOx formed during regeneration of a cracking catalyst in the presence of a metallic carbon monoxide combustion catalyst is decreased without substantially adversely affecting the carbon monoxide combustion activity of the promoter by subjecting the combustion-promoting catalyst to steam treatment prior to employing it in the cracking catalyst regeneration operation.

대표청구항 ▼

A process for cracking hydrocarbons in the absence of externally supplied molecular hydrogen comprising: (1) contacting steam with a carbon monoxide combustion promoter comprising a combustion-promoting metal or compound of a metal selected from platinum, palladium, iridium, osmium, ruthenium, rhodi

A process for cracking hydrocarbons in the absence of externally supplied molecular hydrogen comprising: (1) contacting steam with a carbon monoxide combustion promoter comprising a combustion-promoting metal or compound of a metal selected from platinum, palladium, iridium, osmium, ruthenium, rhodium, rhenium and copper associated with at least one particulate porous inorganic solid at a temperature of 760°C. to 1100°C. and a steam pressure of 1 atmosphere to 15 atmospheres for a period of from 2 hours to 100 hours; (2) cycling particulate cracking catalyst between a cracking zone and a catalyst regeneration zone, in a catalytic cracking system; (3) cracking said hydrocarbons in contact with said catalyst at cracking conditions in said cracking zone whereby coke is formed on said catalyst; and (4) burning coke off said catalyst with an oxygen-containing and nitrogen-containing gas at regeneration conditions in said regeneration zone in the presence of said combustion promoter.