摘要
以一系列不同F含量的双功能催化剂为研究对象,采用TPD、BET、DTA及孔径分布测定等方法,对催化剂的物化性质进行了表征,采用色谱-微反联合装置考查了F对该催化剂加氢裂化活性的影响。结果表明,F的引入可以有效地调节催化剂的宏观结构,致使催化剂内微孔聚并,引起催化剂比表面积下降;同时,F的引入还引起催化剂总酸度下降。并对可能的原因进行了分析。另外,当F离子含量为1.51%和2.36%时。
In this paper,a series of Ni W/F Al 2O 3 SiO 2 catalysts containing constant WO 3 and NiO loadings (38.3%,12.3%) and various amounts of F(0.24% 3.76%),introduced after the deposition of the W and Ni are characterized using TPD,BET,DTA and pore volume distribution measurements.The results are correlated with the activities for the hydrogenation of toluene and the hydrocracking of n heptane,which are performed at 400℃,6.0MPa and 1.0h -1 liquid space velocity using a fixed bed micro reactor.As the concentration of F increases,the specific surface area and the acidity decrease markedly.The decrease in specific surface area can be partly attributed to the breaking of the inner walls of the relative narrow pores and creation of larger ones.The variation in the acidity is a result of co action of variation in the catalyst texture and the inductive effect of F.
出处
《石油化工》
CAS
CSCD
北大核心
1996年第10期685-688,共4页
Petrochemical Technology
关键词
F离子
加氢裂化
双功能催化剂
ion,Ni W/F Al 2O 3 SiO 2 catalyst,hydrocracking