Dissertation > Excellent graduate degree dissertation topics show

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
Read: Download Dissertation

Abstract


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

Related Dissertations

  1. Study on the Energy Efficiency Prediction Model of the Plant of Central Air-conditioning System,TU831.4
  2. Study of Heat Transfer Enhancement about Semiconductor Refrigerating System,TB657.5
  3. The Study of the Electromyography Activities of Trunk Muscle During Load and Unload in Different Static Postures,R687.3
  4. Novel Utilization Technics of Lysine Ion Exchange Wastewater,X703
  5. Preparation and Properties of a Al-based Bulk Amorphous Alloy by Powder Metallurgy,TF125.22
  6. Magnesium based amorphous porous materials,TG139.8
  7. Evolution of Shear Band, Free Volume and Hardness of as Rolled Zr-based Bulk Metallic Glasses,TG339
  8. Glass Forming Ability and Atomic Size Factor of Bulk Amorphous Alloys,TG139.8
  9. Synthesis of MCM-41-supported Bidentate Nitrogen Palladium(Ⅱ) and Bidentate Phosphine Rhodirm(Ⅲ) Complixes and Their Applications in Organic Synthesis,O621.2
  10. Amorphous CoNiB catalyst preparation and catalytic hydrogenation properties of,O643.36
  11. Declines of Lateral Balance in Old People and Effects of Regular Tai Chi Exercise on the Declines,G852.11
  12. Catalytic Properties of MCM-41-supported Palladium and Ruthenium Complexes in Carbon-sulfur and Carbon-carbon Bond Formation Reactions,O643.32
  13. Liquid Phase Hydrogenation of Halogenated Nitrobenzene over Amorphous Alloy Catalysts,O643.32
  14. A Study on Soapy’s Tragedy in the Cop and the Anthem: an Appraisal Approach,I712.074
  15. Study on the Models for Prediction of Desalination Rate Using Electrodialysis,TQ085.4
  16. Treatment of Aniline Wastewater by Electrodialysis,X78
  17. A Pilot Study on Municipal Sewage Treatment and Reuse Via Membrane Process,X703
  18. The Preparation of Ni-B Amorphous Alloy Catalysts and Its Performance on Camphor Catalysis Hydrogenation,O643.32
  19. Simulation of Annual Energy Consumption about Variable Refrigerant Volume Systems,TU831.4
  20. New natural alternative to R22 and R134a refrigerant mixtures,TB64
  21. Research on the Performance of Refrigeration System on the Impact of Evaporative Condenser with Solution Regeneration,TB657

CLC: > Industrial Technology > Chemical Industry > Electrochemical industries > Electroplating industry
© 2012 www.DissertationTopic.Net  Mobile