Hydrothermal Synthesis And Characterization Of Cobalt Phosphide And Iron Phosphide Nanoparticles

Petroleum after a series of process can make into fossil fuels, solvent, industrialchemicals and so on, which are widely used in all walks of life for the nationaleconomy. Hydrofining techniques play an important role in reducing sulphur contentof the heavy oil catalysis cracking gas. To achieve this objective, the study of newcatalytic with a high performance in desulfurization becomes a hot research.Transition metal phosphides have excellent properties in new catalytic materialfield besides transition metal nitrides and carbide. In this paper, cobalt phosphide（Co₂P） and iron phosphide （Fe₂P） nanoparticles were successfully prepared undermild hydrothermal and solvothermal conditions, respectively. The influence of themolar ratio, temperature and duration were systematically studied. The products werecharacterized by XRD, TEM and EDS. The major researches are as follows:1. The synthesis of Co₂P by hydrothermal methodCo₂P nano-particles were successfully synthesized by the hydrothermal method andthe particle size was about10nm. The results are listed as follows:1)When Co/P is1/10, products are readily indexed to a crystalline phase of Co₂Pand has perfect structure and good crystallinity.2) The lowest synthesis temperature of Co₂P is about180oC, while the optimalsynthesis temperature is about200oC. When the temperature goes220oC, a relativelyhigh amount of impurity phase is formed.The optimal reacting time is18h. The products with low crystallinity havegenerated after10h. Along with the rise of duration, Co₂P become perfect crystal withgood dispersivity.2. The synthesis of Fe₂P by solvothermal method Fe₂P nano-particles were successfully synthesized by solvothermal method and theparticle size was about20nm.The results are listed as follows:1) The optimal Fe/P ratio is1/3.When the ratio is1/2or1/5, the products have badpurity and low crystallinity.2) When the reacting time is10h, the product has optimal cystallinity. The productappear after6h and become perfect along with the extension of reacting time. Thestructure has been destroyed after10h.3) The optimal synthesis temperature is about200oC.When temperature variedfrom180oC to200oC, the peak intensity of Fe₂P increased. But when the temperaturerose to220oC, impurity phase is formed.