A soaking solution, its preparation and application

A soaking solution, its preparation and application, the solution containing the cobalt-containing compounds, molybdenum-containing compounds, phosphorus-containing compound and citric acid, the solution concentration as cobalt-containing cobalt compound as 0.01-0.1g / mL, to the concentration of molybdenum as molybdenum-containing compound is 0.05-0.4g / mL, a concentration of the phosphorus-containing compound in terms of phosphorus is 0.005-0.10g / mL, citric acid concentration of 0.05-0.5g / mL, to UV - Vis analytical characterization, λ≤1 the impregnation solution, [lambda] is a UV - Vis spectrum peak at 517 ± 10nm and 772 ± 10nm in spectral peak at a high ratio. Compared with the prior art, the present invention is to provide impregnation solution was prepared with better hydrogenation catalyst performance.