铂锡重整催化剂体系下正庚烷转化规律研究

以链烷烃中较难转化的正庚烷为模型化合物，考察碱金属K、稀土Ce和K、双稀土金属（Ce和Eu）对铂锡重整催化剂体系下正庚烷转化的影响。结果表明：与铂锡催化剂相比，添加0.045%、0.060%的K，使得催化剂载体强L酸量下降，有利于抑制裂解产物，510 ℃裂解产物下降约5百分点，同时异构烷烃选择性上升约7百分点；添加0.28%Ce和0.010%、0.030%的K，510 ℃时裂解产物选择性下降4.2~7.1百分点，异构烷烃选择性上升7.4~9.8百分点，但随着反应温度升高对正庚烷转化的影响有一定程度的削弱；添加双稀土金属后，在较低反应温度（510 ℃）下能够有效降低裂解产物选择性、提升异构烷烃选择性，随着反应温度升高，双稀土对正庚烷转化的影响显著削弱。

STUDY OF N-HEPTANE CONVERSION RULE OVER Pt-Sn REFORMING CATALYST

N-heptane, the paraffin that is difficult to convert, was used as a model compound to investigate the effect of potassium, mixture of rare earth cerium and potassium, and bi-rare earth metals (Ce,Eu) on n-heptane conversion. The results showed that adding potassium (0.045%, 0.060%) decreases the strong Lewis acidity of catalyst support, inhibiting the cracking reaction. At 510 ℃, cracking products decrease about 5 percentage points and the selectivity of iso-paraffins increases about 7 percentage points; adding mixture of cerium (0.28%) and potassium (0.010%, 0.030%) decreases the selectivity for cracking by 4.2-7.1 percentage points, while the iso-paraffin selectivity rises 7.4 - 9.8 percentage points at 510 ℃. Increasing reaction temperature has a weakened effect to certain extent on n-heptane conversion; Addition of bi-rare earth metals can effectively reduce the selectivity for cracking product at low temperature (510 ℃)，but the iso-parafin selectivety rises. The effect of addition of bi-rare metals on heptane transformation is weakened significantly with increasing the reaction temperature.