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CoP Alloy catalytic decomposition PH_3 high purity phosphorus

Author: LiangPeiYu
Tutor: ZhangBaoGui
School: Nankai University
Course: Environmental Science
Keywords: cobalt hypophosphite electrodialysis CoP CoP/TiO2 supported catalysts amorphous alloy catalysis decomposition
CLC: TQ153
Type: PhD thesis
Year: 2006
Downloads: 177
Quote: 0
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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(H2PO22 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

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