Surface Amphiphilic Nano Tungsten Molybdenum Sulfide Hydrogenation Catalyst

Suspension bed hydrogenation is an advanced technology for preparing liquid fuel oil from heavy unconventional oil. Suspension bed hydrogenation process requires catalyst with high activity, high dispersibility, high stability and good economy. Tungsten sulfide and molybdenum sulfide catalysts have been used as hydrogenation catalysts in petroleum processing. They are widely used in hydrodesulfurization, hydrodenitrification and other reactions. They are very promising catalysts for heavy oil hydrogenation in suspension bed process to produce clean fuel.

Recently, Dalian Research Institute of Chinese Academy of Sciences has developed a surface amphiphilic nano-sized tungsten-molybdenum sulfide hydrogenation catalyst, which is prepared by solution chemical method, including the following steps:

A certain amount of potassium dithiotungstate is added to 500 mL deionized water to make the tungsten concentration reach 0.05 mol/L and stir to uniformity; a certain amount of sodium dithiomolybdate is added to make the molybdenum concentration reach 1.5 mol/L; potassium sulfide solution is added to the mixture to make S: (W+Mo) (molar ratio) reach 4:1, stir to uniformity, and react at 65 ℃ for 14 h; and the mixture is added to the mixture. Potassium borohydride, making potassium borohydride: (W+Mo) (molar ratio) reach 2.2:1, stirring to uniformity; adding ionic liquid 1-propyl-3-methylimidazole hexafluorophosphate to the above mixture, making 1-propyl-3-methylimidazole hexafluorophosphate: (W+Mo) (molar ratio) reach 16:1, stirring to uniformity, configuring into the initial reaction mixture; transferring the initial reaction mixture to the autoclave, in 1900 Crystallization at 24 h. After crystallization, the reactants were cooled to room temperature, filtered, washed with deionized water and dried to obtain surface amphiphilic nano tungsten molybdenum sulfide hydrogenation catalyst.

The new process uses ionic liquids in the synthesis system. The prepared nano-molybdenum tungsten sulfide has good surface amphiphilicity, excellent dispersion and catalytic activity in polar and non-polar catalytic reaction systems. It can be used in suspension bed hydrodesulfurization, hydrodenitrification, hydrodearomatics and hydrodeasphalting reactions of coal tar, heavy oil, super heavy oil, residue and foliate oil. It also has good application prospects in photoelectric conversion, photocatalytic water hydrogenation and other reactions.

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