Dissertation > Excellent graduate degree dissertation topics show

Thermal Decomposition Mechanism and Kinetics Analysis of Carboxylate

Author: ZhanDan
Tutor: ZhangKeLi
School: Wuhan University
Course: Inorganic Chemistry
Keywords: phthalate thermal decomposition thermal technique carboxylate kinetic
CLC: O641.4
Type: Master's thesis
Year: 2005
Downloads: 282
Quote: 0
Read: Download Dissertation

Abstract


Thermal analysis is one of important characters for solid compounds. Thermal analysis is to investigate the physical and chemical process during material is heated, which is a absolutely necessary measurement for investigate on thermal stability of materials. Recently, with the improvement of thermal analysis apparatus’s precision especially the introduction of excellent kinetic soft, thermal analysis technique become more important for investigate the inorganic compounds including coordinates.In present thesis, the thermal stability of phthalates in nitrogen atmosphere was studied by thermal technique（ TG, DTA, DSC et al ）, thermal decomposition mechanism was discussed; thermal decomposition kinetics of nickel oxalate and magnesium phthalate were studied by model-free and model-fitting method, the most probable kinetic triplet was obtained, which offer a new data for decomposition of these kind of materials. The results were listed as below:1. For thermal decomposition of alkli- and rare-earth metal phthalates in nitrogen atmosphere, C-C and C-0 bond rupture is mainly proceeded, thus radicals are formed. New organic compounds such as benzophenone and anthroquinone were produced after the radicals were reorganized, which are difficult to synthesis with common methods. The last solid residue is generally metal oxides or carbonates.2. The decomposition of NiC2O4·H2O in air atmosphere proceeded in two stages: it first lost two crystal water to form anhydrate salt, then anhydrate salt decomposed further. The last solid product was nickel oxides. Kinetics analysis of NiC2O4·2H2O decomposition steps was performed under non-isothermal conditions. The activation energies were calculated through Friedman and Flynn-Wall-Ozawa （FWO） methods, and the most possible kinetic model function has been estimated through the multiple-linear regression method. Thosewere f（a） = （1 - α）n (1 + Kcatα) , f（a） = （1 - α） (1 + Kcatα) , respectively. Theactivation energies for the two decomposition steps of NiC2O4·H2O were 171.1 and 174.4kJ/mol, respectively.3. Kinetic analysis was carried out for thermal decomposition of magnesium phthalate in the range of 400600°C. It was found that the thermal decomposition was proceeded in two stages by model-free analysis. At the same time, the initial value of Ea and lgA for model-fitting analysis was obtained. The most possible kinetic triplet was obtained through multiple non-linear regression method. The results are as following: the most possible kinetic model function are Fn -*? Fn,f（cc） = （\- a）n, n=1.33> 0.69, respectively. The optimized activation energyEa=232.24 445.36KJ/mol, lgA= 13.26, 27.78S’1, respectively.

Related Dissertations

  1. Experimental Study on Pyrolysis and Combustion Characteristics of Paint and Tar Based Single Hazardous Wastes,X705
  2. Pd-based cathode catalysts of direct methanol fuel cell,O643.36
  3. Recovery Sulphur from Zinc Concentrate of Pressure Acid Leaching Residue,X751
  4. Studies on Prediction Models for Fruit Decay and Shelf-Life of Postharvest Strawberry,TS255.4
  5. Bioavailability of Phthalic Acid Esters in Different Types of Soil-plant Systems,X53
  6. Experiment Study of Ethylhexyl Phthalate (DEHP) and It’s Metabol-ites (Single-ethylhexyl Phthalate, MEHP) Influencingon Sper Matogoniain Young Male Wistar Rats,R329
  7. Imidazolium ionic liquids Thermal Analysis,O626.23
  8. Study on Producing Enantiopure Benzyl Glycidyl Ether by Biotransformation,TQ920.6
  9. Theoretical Study on the Degradation Mechanism of the Environmental Endocrine in Atmosphere,X51
  10. Preparation, Characterization and Electrochemical Performace of Rthenium-titanium Composite Oxide and Its Supported Catalyst,O643.36
  11. Theoretical and Experimental Study on the Kinetic Model of CSM Demulsification & Devolatilization by the Water-Jet Method,TQ331.4
  12. Liquefaction Kinetics of Shendong Coal with High Inertinite,TQ529.1
  13. Coking Coal Pyrolysis and Char Gasification of Thermal Analysis Kinetics and Coking Index,TQ541
  14. Sorption Enhanced Methane Steam Reforming Reaction for Hydrogen Production,TQ116.2
  15. Study on Synthesis of 1,6-Hexamethylene Diisocyanate by Thermal Decomposition,TQ225.24
  16. Study on the Synthesis and Process of Penthiopyrad,TQ455.4
  17. Fluorescence Quantitative PCR for Detection of PAEs,O657.3
  18. Study on the Stereoselective Synthesis of Anti-Mdd Drugs with Chiral α-Substituted Secondary Alcohol as Key Intermediate,TQ463
  19. Studies on the Estrogenic Effect and the Biodegradation of Phthalate Esters,R114
  20. Fermentation Process Optimization and Kinetic Studies of Rhamnolipid Production by the Pseudomonas Aeruginosa M14808, Mutated by Simulated Space Environment,TQ920.6
  21. Kinetics of the Hydrolysis of 3-bentene Nitrile in Hydrochloric Acid Solutions,TQ225.134

CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Structural Chemistry > Complex chemistry ( coordination chemistry )
© 2012 www.DissertationTopic.Net  Mobile