The research progress of changing the final active phase of the catalyst by using complexing agents during the preparation of oil hydrodesulfurization catalysts is discussed. The common complexing agents and their effects on catalyst performance improvement under different usage methods are introduced. The effect of the complexing agent on the microstructure of the catalyst is systematically described, and the reason of the complexing agent can improve the performance of the catalyst is explained.

Corrosion inhibition effect of N(4sulfonic acid) butyl triethylammonium hydrogen sulfate((CH2)4SO3HTEA\]\[HSO4]) acid ionic liquid(IL) towards Q235 steel corrosion in 0.5 mol/L HCl solution was investigated by electrochemical measurements in 25 ℃. The results show that the IL suppressed corrosion processes of Q235 steel in HCl solutionand the best performance of inhibition could be obtained with the concentration of inhibitor 14 mmol/L. The X-ray photoelectron spectroscopy(XPS) demonstrates that the protectiue film is formed by adsorption on the Q235steel surface, which can cover the reative center and inhibit the Q235 steel corrosion in HCl solution.