CoP Alloy Catalytic Decomposition Of PH <sub> 3 </ Sub> For The Study Of High-purity Phosphorus

With the wide application of electroless plating baths, the requirement of sodium hypophosphite is increasing rapidly in the past years. One side, it improve the development of hypophosphite industry, but on the other hand ,in the process of produce,it is inescapable give birth to much PH₃,a toxic gas. The traditional method of deal with it is burning and absorbing to make phosphorus acid. This paper we produced cobalt hypophosphite by the method of electrodialysis; prepared CoP amorphous alloy and used to decomposition of PH₃.1. Prepared cobalt hypophosphite by electrodialysisCompared to the duplex decomposition , the method of electrodialysis can get higher purity of cobalt hypophosphite. We prepared cobalt hypophosphite under the conditions that the current is 2.5A, the current density is 3.85A/dm2,and the membrane area is 65 cm², Co(H₂PO₂)₂ can reach a concentration in about 18 hours .adjust pH with Co(OH)₂, crystal can be get after concentration by negative pressures .Meanwhile, we did some experiments about the reuse of ion transfer membrane. It is found that 1% HC1 is optimal in cleaning the used membrane. The efficiency of the renewed ion transfer membrane is about 67%, so it can be used repeatly. We also prepared cobalt hypophosphite by the method of duplex decomposition, and discussed the technics and conditions. The product of duplex decomposition can be used to electroless plating baths after recrystal.2. Preparation and properties of the CoP amorphous alloy catalystsThe other emphases in this paper is the preparation of CoP amorphous alloy catalysts and its use in decomposition of PH₃. We studied the optimal conditions of preparing CoP amorphous alloy, compared the properties of the CoP which prepared under different conditions, and the pilot study on the conditions of decomposition of PH3 was made.(1) The preparation and properties of the CoP amorphous alloyInfluence of reaction conditions such as temperature, solvent, concentration of Co²⁺,moler ratio of H₂PO₂^-/Co²⁺ on the physical properties were investigated. XRD ICP TEM technology were used to characterized their composition, structure, yield and thermal stability.(2) The preparation CoP/TiO amorphous alloyTiO₂ PdCl₂ were used to prepare supported CoP/TiO2 amorphous alloy catalysts.3. Decomposition of PH3...