FCC催化剂的钒危害与捕钒剂研究I.钒危害与MgO、γ-Al_2O_3捕钒剂

Study on the Vanadium Poisoning & VTrap in FCC Catalyst I. Vanadium Poison & Vtrapping Functions of MgO, γAl_2O_3

采用 XRD、BET、MAT以及 Pyridine- IR等方法 ,研究了钒对催化剂分子筛结构和裂化活性的危害 ,以及 Mg O、γ- Al2 O3对钒破坏作用的抑制。结果表明 ,在水蒸气条件下 ,钒使催化剂表面积减小 ,分子筛晶体结构破坏 ,各种酸的数量下降 ,裂化活性降低。捕钒物质的加入保护了催化剂的结构和酸性及活性 ,尤其以 Mg O负载在 γ- Al2 O3上得到的捕钒效果最佳。

By the characterization of XRD, BET, pyridineIR, MAT, the vanadium poisoning of FCC catalysts & Vtrapping functions of MgO, γAl_2O_3 are described. Experimental results identify that: through the simultaneous actions of steam and vanadium, the surface area, acidity, and the activity of the FCC catalysts are decreased, and the crystal structure of zeolite is damaged; steam is the essential factor for the vanadium poison to catalysts. MgO and γAl_2O_3 both have the potential of preventing the catalysts from vanadium contamination, MgO loaded on Kaolin has the inferior Vtrapping performance than that of the MgO loaded on γAl_2O_3. Vanadium oxide can be used as the substitute of vanadium naphthenate in this field.