超临界汽油中煤焦油加氢裂化催化剂研究

为了提高超临界汽油中煤焦油加氢裂化轻质油的收率,研究了Co-Mo-Pd-Y沸石催化剂制备条件对轻质油收率的影响。分别考察了催化剂负载金属中Co/(Co+Mo)原子比、催化剂焙烧温度、分子筛酸处理浓度、酸处理温度及时间对煤焦油加氢裂化催化反应收率的影响。结果表明:当Co/(Co+Mo)原子比(摩尔比)为0.5,催化剂焙烧温度为550℃,分子筛酸处理浓度为2 mol/L,酸处理温度为70℃及处理时间4 h时,轻质油收率(质量分数)可达81.5%,并且对此条件下制备的催化剂通过N2吸附及XRD进行了表征。制得的催化剂在超临界溶剂中煤焦油加氢裂化反应中表现出较高的活性,煤焦油获得了高的轻质油收率。

Catalyst study for coal tar hydrocracking in supercritical gasoline

The effects of preparing conditions of Co-Mo-Pd-Y catalyst series on the light oil yield were investigated in order to improve the light oil yield of coal tar hydrocracking of supercritical gasoline.The effect factors to light oil yield were studied,such as atom ratio(mole ratio) of Co to(Co+Mo),catalyst calcination temperature,acid solution concentration dealing with Y zeolite,temperature of acid solution,and time of Y zeolite dipping in acid solution,to obtain higher light oil yield.The results show that the light oil yield can reach 81.5%(mass fraction) when the atom ratio of Co to(Co+Mo) is 0.5,catalyst calcination temperature is 550 ℃,acid solution concentration is 2 mol/L,temperature of acid solution is 70 ℃,and time of Y zeolite dipping in acid solution is 4 h.The Co-Mo-Pd-Y catalyst prepared under the optimal operating conditions was characterized by means of N2 adsorption isotherm and XRD.The catalyst prepared shows that high activity and higher light oil yield are obtained.