渣油悬浮床加氢裂化反应过程中Ni催化剂的形态与活性

 对水溶性Ni催化剂存在下的克拉玛依常压渣油加氢裂化反应不同反应时间反应产物中的催化剂进行了分离和抑焦活性评价. 结果表明, 在反应时间为1和2h时, Ni催化剂主要存在形式为NiS和Ni₃S₂; 反应3h后, NiS成分相对减少, Ni₃S₂成分相对增加, Ni₉S₈晶粒的衍射峰强度在不断增强;反应时间为4h时,主要存在的晶体类型是Ni₉S₈;不同晶体类型硫化态催化剂的抑焦活性不同, 水溶性Ni催化剂存在下的克拉玛依常压渣油加氢裂化反应最适宜的反应时间为1～2h.

PROPERTIES OF DISPERSED Ni CATALYST FOR SLURRY PHASE HYDROCRACKING OF RESIDUE

The dispersed Ni catalysts, which were separated from products obtained in slurry phase hydrocracking reaction of Karamay residue (KLAR) at different reaction time, were characterized by BET method and XDR and their coke restraining ability were also evaluated. It was indicated that the water-soluble salts in the Ni catalyst turned into NiS and Ni3S2 after 1 h or 2 h reaction, respectively. At 3 h of reaction, NiS content reduced and Ni3S2 somewhat increased, and the crystal of Ni9S8 was appeared in the catalyst. At 4 h of reaction, the Ni catalyst was mainly made up of Ni9S8. It was also concluded that the coke restraining abilities of the Ni catalyst containing different kinds of crystals were different, and the proper reaction time of KLAR hydrocracking with dispersed Ni catalyst was 1~2 h.