降低FCC再生烟气NO_x排放助剂的开发

DEVELOPMENT OF DECREASING NO_x EMISSION ADDITIVES FOR FCC FLUE GAS

开发了用于降低FCC再生烟气NOx排放的RDNOx系列助剂（Ⅰ型和Ⅱ型助剂）。Ⅰ型助剂为非贵金属助剂,主要是通过催化CO对NOx的还原反应以降低NOx排放;Ⅱ型助剂为贵金属助剂,替代传统Pt助燃剂,在等效助燃CO的同时减少NOx的生成。两类助剂可以单独使用,也可以同时使用。助剂性能评价结果表明,在催化剂藏量中加入0.5%~0.9%的Ⅱ型助剂与2%~4%的Ⅰ型助剂,可以在基本不影响FCC产品分布的情况下,使再生烟气NOx排放量降低50%~64%。

Reducing NOxemission additives for FCC flue gas（RDNOx,typesⅠandⅡ）were developed.RDNOx-Ⅰ,a non-noble metal additive,is used to reduce NOxemission through catalyzing the reaction of NOxreduction.RDNOx-Ⅱ,a noble metal additive,is used to substitute Pt based CO promoter,as it can promote CO combustion and decrease NOxformation at the same time.RDNOx-ⅠandⅡcan be used separately or simultaneously.The evaluation results show that when 0.5%—0.9% of RDNOx-Ⅱand 2%—4%of RDNOx-Ⅰ are applied,NOxemission in flue gas is reduced by about 50%—64%,while no negative influence on FCC product distribution is observed.