新型孔结构渣油催化裂化催化剂

高温短接触FCC工艺和原料的重质化要求FCC催化剂具有大孔，以增加大分子烃在催化剂中的扩散速度，提高催化剂的反应性能。在不改变催化剂组成的前提下，采用聚苯乙烯微球为模板剂在催化剂基质中引入适量的、尺寸可控的大孔；通过SEM、N2吸附等对催化剂的形貌和孔结构进行了表征；以大庆常压渣油为原料，测定了催化剂的反应性能。实验表明，大孔催化剂中孔体积和比表面积随模板剂用量的增加而增加；在模板剂用量相同时，模板剂粒径越小孔体积和比表面积增加越多。模板剂的引入不仅增加了催化剂中的大孔孔体积，使得催化剂中微孔部分的体积和比表面积也有了一定增加。模板颗粒法合成的催化剂，扩散阻力小，重油转化率高，轻油收率高。

Novel macroporous residua FCC catalysts

It has been generally accepted that internal diffusion in catalyst has become increasingly important for Residue Fluid Catalytic Cracking(RFCC) because of the large molecules of residue,high reaction temperature and the short contact time between the catalyst and residue during the catalytic process.The creation of mesopores and macropores inside RFCC catalyst is considered as an effective approach to improve the accessibility and catalyst performance.In this paper,polystyrene particles were used as template to introduce macropores to the RFCC catalysts.The pore structure was characterized by SEM and N_2 adsorption.The catalytic cracking performance of the RFCC catalysts with macroporous structure was tested in a fixed-bed tubular reactor using Daqing atmospheric residue as feed.The macroporous catalysts exhibit better catalytic performance,higher conversion,and higher yield of light oil than the controller catalyst.