The present invention relates to a trifunctional catalyst used in catalytic cracking device in petroleum refining industry and a method for preparing the same. The trifunctional catalyst of the invention comprises absorbent, cerium dioxide and vanadium pentoxide acting as oxidative catalyst and cerium oxyfluoride acting as structural promoter. The oxidative catalyst and structural promoter are dispersed over the absorbent. The absorbent is spinel-based composite oxides having a general formula of MgAl
2-x
Fe
x
O
4
.yMgO, where the x is 0.01-0.5 and y is 0.2-1.2. In the trifunctional catalyst, the raw material for forming the chemical compound containing rare-earth cerium is hamartite powder. The method for preparing the trifunctional catalyst of the invention is shown as follows: the components relating to the preparation of the finished product are dissolved or dispersed into liquid materials; then the trifunctional catalyst is obtained after the mixing, drying and calcining of such liquid materials. The trifunctional catalyst of the invention is used for highly efficient absorption and desorption of sulfoxides contained in the catalytic cracking flue gas regenerated in the process of petroleum refining, the combustion promoting of carbon monoxide and the reduction of nitrogen oxides. Furthermore, the method for preparing such trifunctional catalyst is featured for its lower cost.
本发明涉及一种在
石油精炼工业中催化裂化装置中使用的三元催化剂及其制备方法。该发明的三元催化剂包括吸附剂、氧化催化剂的
氧化铈和
五氧化二钒以及作为结构
促进剂的
氟氧化铈。氧化催化剂和结构
促进剂分散在吸附剂上。吸附剂是以MgAl2-xFexO4.yMgO为一般公式的尖晶石基复合氧化物,其中x为0.01-0.5,y为0.2-1.2。在三元催化剂中,形成含稀土
铈的化合物的原材料是
铁锰矿粉。本发明的三元催化剂制备方法如下:与制成成品相关的组分被溶解或分散到液体材料中,然后在混合、干燥和焙烧这些液体材料后得到三元催化剂。本发明的三元催化剂用于高效吸附和脱除在
石油精炼过程中再生的催化裂化烟气中含有的亚砜,促进
一氧化碳的燃烧和还原氮氧化物。此外,本发明的三元催化剂制备方法具有更低的成本。