循环污染老化法模拟FCC平衡剂金属年龄分布

RECYCLING METAL CONTAMINATION AND AGING METHOD FOR SIMULATING METAL AGE DISTRIBUTION OF FCC EQUILIBRIUM CATALYST

对比了循环污染-氧化还原循环的预处理方法与传统的浸渍污染-100%水蒸气老化的预处理方法对催化剂性能的影响,利用光学显微镜和电子探针等方法,考察了循环污染老化制备的老化剂、传统方法制备的老化剂以及工业平衡剂上的金属分布特点。结果表明:当微反活性相当时,两种方法制备的老化剂上产品分布差别较大,循环污染老化法制备的老化剂上产品分布较好,更能接近工业平衡剂水平;传统方法制备的老化剂上金属无年龄分布,循环污染老化法制备的老化剂上含属有年龄分布,与工业平衡剂更接近。

The effects of the pretreatment methods of cyclic contamination-oxidation-reduction cycle and traditional impregnation contamination-100%water vapor aging on the performance of FCC catalysts were compared.The characteristics of metal distribution on the catalysts prepared by the two pretreatment methods as well as FCC ECat were investigated by means of optical microscopy and electron probe microscope analysis.The experimental results showed that the product distribution of the two types of aged catalysts is different when the microactivity is comparative.The product distribution of catalyst prepared by the cyclic contamination aging method is good,close to the level of ECat.The aged catalyst prepared by traditional method have no metal age distribution,while metals on circulating pollution aging catalyst have age distribution and is close to ECat.