钒污染FCC催化剂上钒的价态变化及其对催化剂结构的影响  

Variation of Vanadium Valence State in Vanadium Contaminated FCC Catalyst and Adverse Effects on the Catalyst Structure

作　　者：谭丽[1] 汪燮卿[1] 朱玉霞[1] 王子军[1] 任飞[1] 李本高[1] 

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《石油学报（石油加工）》2014年第3期391-397,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：中国石化股份有限公司项目(ST13048)资助

摘　　要：选择一种含Y型分子筛的FCC催化剂,采用浸渍法污染质量分数0.87%的钒(V),并采用TPR和ESR方法表征催化剂上V的价态,考察还原和老化处理前后V的价态变化,以及在老化过程中不同价态V对催化剂结构的影响。结果表明,在650℃、CO还原条件下,催化剂上的V由V+5转化为V+4;在780℃、惰性气氛下老化,V+5可转化为V+4,在780℃、H2体积分数0.12%气氛下老化,V+4、V+5可被还原为V+3。在高温水热条件下,V+5不仅破坏了催化剂的分子筛结构,也破坏了基质结构,而V+3、V+4对催化剂结构的破坏作用很小。Samples of an FCC catalyst impregnated with 0.87% vanadium（V） and subjected to reduction treatments, were characterized by means of temperature-programmed reduction （TPR） and electron spin resonance （ESR）, and tested in an aging procedure to study the effects of different valence state of V on the catalyst structure. The valence state conversion of V during reduction and aging treatments was also investigated. The results showed that a significant part of V on the V contaminated catalyst converted from V＋5 to V＋4 in CO reducing atmosphere at 650℃, while during aging treatment at 780℃, a part of V converted from V＋5 to V＋4 under inert atmosphere and converted from V＋5 or V＋4 to V＋3 under 0.12% H2 reducing atmosphere. Under heating and steaming conditions, V＋5 considerably destroyed not only the zeolite structure, but also the substrate structure, while V＋3 or V＋4 had little destructive effect on the catalyst structure.

关 键 词：钒 价态 催化剂中毒 催化裂化 

分 类 号：TE624.9[石油与天然气工程—油气加工工程]