摘要
分别采用固定床和膨胀床对加氢催化剂(汽油二段加氢精制催化剂和石蜡加氢精制催化剂)进行了器外预硫化。利用高压微型反应器,以1-己烯与正庚烷混合物(二者质量分数分别为16%,84%)为原料,在液体空速为7.2 h-1,氢气/原料油(体积比)为300,温度为120℃,压力为4 MPa的条件下,对硫化催化剂进行了模拟反应活性评价,并借助吡啶-程序升温脱附、程序升温硫化及X射线衍射等方法对硫化后催化剂进行了表征。实验结果表明,高温H2S穿透床层的速度较快;在相同时间内,温度升高硫化度增加;硫化催化剂活性在370℃左右达到最大值(98.38%)。表征结果表明,高温硫化将导致催化剂活性相分散度变差,而且使高温硫化催化剂酸性明显增加。
Hydrogenation catalysts were presulfurized exsitu in a expanded bed and a fixed - bed respectively. The hydrogenation activities of sulfurized catalysts for model compound （ the mass fraction of hexylene 16% and the mass fraction of heptane 84% ） were evaluated in a high pressure microreactor at liquid space velocity 7.2 h - 2, volume ratio of H2 to oil 300, reaction time 3 h, reaction temperature 120℃ , reaction pressure 4 MPa. The sulfurized catalysts were characterized by pyridine - temperature programming desorption （TPD） , temperature programming sulfurization （ TPR ） and X - ray diffraction （XRD）. The results showed that the penetration velocity sped with increasing the temperature, and the sulfurization degree enhanced with increasing the temperature. The hydrogenation activity of sulfurized catalysts got up to the maximum of 98.38% at about 370℃. The higher presulfurization temperature would cause a worse dispersion state and an obvious high acidity.
出处
《石化技术与应用》
CAS
2009年第3期246-249,共4页
Petrochemical Technology & Application
关键词
加氢催化剂
预硫化
温度
转化率
催化活性
hydrogenation catalyst
presulfurization
temperature
conversion
catalytic activity
