HY和USY分子筛对模拟油品中碱性氮化物的吸附行为

Adsorption behavior of basic nitrides in model oil on HY and USY moleclar sieves

以HY、USY分子筛作为吸附剂,喹啉的十二烷溶液为模拟油,在间歇式微型反应釜中,进行了静态吸附脱除碱性氮化物的实验研究。考察了两种分子筛的吸附温度、剂油质量比对脱氮率的影响,并对其吸附热力学、吸附动力学进行了研究。结果表明,HY和USY分子筛最佳吸附温度分别为100℃和140℃,最佳剂油质量比为1∶30;通过吸附热力学的研究,得出两种分子筛的等温吸附曲线为H型化学吸附曲线,Langmuir等温方程拟合相关系数大于0.999,新建立的等温化学吸附方程可以很好地拟合等温吸附曲线;吸附焓变?H>0,自由能变?G<0,吸附熵变?S>0,实验条件下碱性氮化物在两种分子筛上的吸附是吸热的、自发的化学吸附过程;采用3种动力学模型对两种分子筛的吸附行为进行拟合,得出准二级动力学模型是描述两种分子筛吸附过程的最佳动力学方程,相关系数大于0.999。

The adsorption tests of quinoline in dodecane solution on HY and USY moleclar sieves were conducted in a batch micro-reactor. The influences of adsorption temperature and iuuratio of adsorbent to oil on denitrification were investigated. Morever, experimental study of adsorption thermodynamics and kinetics was performed. The best adsorption temperature was 100 ℃ and 140 ℃ for HY and USY moleclar sieves respectively, and the best ratio of adsorbent was 1 ： 30 for these two molecular sieves. Adsorption thermodynamics showed that two isotherms absorption curves of molecular sieves were H chemisorption curves. The correlation coefficients of Langmuir equation were more than 0.999. The newly established chemisorption equation could simulate isotherms absorption curves well. Adsorption enthalpy △H〉0, free energy △G〈0, adsorption entropy △S〉0, which showed that it was an endothermic and spontaneous chemisorption of basic nitrides on these two types of molecular sieves. Three kinetic models were used to fit adsorption behavior, and the best kinetic equation to describe the adsorption process was pseudo-second order model with correlation coefficient more than 0.999.