新型大孔结构重油加氢催化剂的制备、表征与评价

Preparation,characterization and catalytic performance of novel macroporous catalysts for heavy oil hydrogenation

将聚苯乙烯(PS)颗粒模板加入到铝溶胶中,经干燥、煅烧除去PS模板制备了大孔氧化铝载体;采用低温N2吸附-脱附和SEM对合成Al2O3的孔结构进行了表征;将Co-Mo活性组分担载在大孔氧化铝载体上制得重油加氢催化剂,并以大港焦化蜡油为原料在固定床高压微反装置上对合成的催化剂进行活性评价。实验表明,加入PS模板后,A l2O3的比表面积增加了41.5 m2/g,孔体积增加了0.35 cm3/g;加氢脱硫活性提高了12%,脱氮活性提高了22%。

Macroporous Al2O3 was prepared through mixing Al2O3 sol with polystyrene （PS） microspheres, drying the suspension, calcining them to remove the PS template. The prepared Al2O3 supports were characterized by N2 adsorption-desorption method and SEM. Macroporous Co-Mo/γ-Al2O3 catalysts were prepared by impregnating Co- Mo onto the Al2O3 supports. It was shown that BET surface area and pore volume of the PS template-prepared Al2O3 were 41.5 m^2/g and 0. 35 cm^3/g, which were higher than those of controller catalyst, respectively. The catalytic performance of the prepared catalysts was tested in a high-pressure micro fixed-bed reactor using heavy Dagang coking gas oil as feedstock. The desulfurization degree and denitrification degree of the prepared macroporous catalyst, prepared using PS microspheres as template, were 12% and 22%, which were higher than those of controller catalyst.