悬浮床加氢裂化水溶性催化剂的筛选与表征

催化加氢作用， 当金属组分A和组分B浓度分别为 15 μg/g ～ 25 μg/g 和 1100 μg/g～1300 μg/g时催化剂具有较好的催化加氢活性。两元水溶性催化剂硫化后的XPS、XRD和TEM分析结果表明：活性组分经硫化反应后生成了金属硫化物，但组分A硫化率不足50％；组分B易硫化结晶，其晶粒成为组分A的硫化物晶粒或颗粒分散的“载体”，使组分A的硫化物具有较高的分散度，提高了催化剂的加氢活性；A-B双金属水溶性催化剂经硫化反应后所形成的颗粒尺寸在100 nm左右，说明两元金属催化剂在硫化结晶过程中确实存在相互分散和抑制晶粒增长的作用。

STUDY ON SLURRY CATALYST FOR KELAMAYI RESIDUE HYDROCRACKING

Water soluble bimetallic catalysts, derived from FeSO4·7H2O and ammonium heptamolybdate(AHM), were used for upgrading Kelamayi AR at an initial H2 pressure of 7.0MPa, 436 ℃, for 1 h. No coking (toluene insolubles <1%), and high yield of the distillates (<450 ℃, about 60%) show that the catalyst has a high activity in inhibiting coking and hydrocracking. To treat Kelamayi AR, the best concentrations of Mo and Fe are 15 μg/g～25 μg/g and 1100μg/g～1300μg/g in the studied range. The catalysts were characterized by XPS, XRD and TEM and it was confirmed that metals are present as metallic sulfides. Molybdenum is more difficult in sulfuration reaction than iron, thus the sulfuration conversion of Molybdenum is less than 50%. The nature of reciprocity between components of the bimetallic catalysts is “physiochemical-dispersion”, which can inhibit the crystal growing up each other. Compared with oil-soluble catalysts, the grain of water-soluble catalysts (100 nm) after sulfuration reaction is large, but smaller than monometal catalyst. As may be the result of inhibiting the crystal growing.