A fluidized catalytic cracking process using a high efficiency regenerator comprising a coke combustor, a dilute phase transport riser, and a second fluidized bed with catalyst recirculation to the coke combustor, is operated to reduce NO.sub.x emissions in the regenerator flue gas. The amount of catalyst...http://www.google.com.au/patents/US5130012?utm_source=gb-gplus-sharePatent US5130012 - Process and apparatus for reducing NO.sub.x emissions from high-efficiency FFC regenerators
