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Laboratory Investigation of the Effective Pparametrs on the Particle Size Distribution at the Nanoscale During the Synthesis of Zirconium Oxide Powder and the Effectiveness of each on the Uniform Distribution of the Particle Size of the Final Powder

Bagheran, Sevda | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53447 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Cyrus; Fotovat, Farzam; Malek Khachatourian, Adrineh
  7. Abstract:
  8. Reaction parameters in precipitation processes have a significant impact on the product characteristics. The process of formation of yttrium-stabilized zirconia precipitates was studied by co-precipitation method to investigate the parameters affecting particle size distribution. These studies aimed to investigate the reaction parameters and determine their effect on the size of the particles, taking into account the effects caused by the interaction of the parameters. To achieve this goal, the design of the experiment based on response surface methodology was used and five parameters of zirconyl chloride concentration, molar percentage of yttrium oxide, reaction time, mass percentage of polyethylene glycol and final pH of the process were studied as experimental variables. These variables were studied at 5 levels for each variable in the form of 32 experiments. characterization of the size distribution of the samples obtained from each experiment were done by particle size determination test. By analyzing the results using the response surface methodology, a nonlinear relationship for particle size was determined as a function of the studied parameters and their interaction, and the behavior of the system was displayed in 3D surface diagrams. By setting the target of 20 nm for the particle size of the powder, the reaction conditions were obtained as a 0.405M zirconyl chloride, 1.2% molar yttrium oxide, 1.05 wt% PEG, and reaction time of 75 min to reach a final pH of 10. In order to improve the catalytic properties of zirconium oxide, the specific surface area of the samples obtained from the experiments was studied and the affecting parameters were determined. the maximum value of specific surface area predicted by studying the equation was 129.19 m2 / g and the reaction conditions were obtained to be 0.81 M zirconyl chloride, 2% molar yttrium oxide, 4 wt% PEG and reaction time of 30 minutes to reach the final pH of 10
  9. Keywords:
  10. Zirconium Oxide ; Co-Precipitation ; Response Surface Method ; Catalyst ; Scale Formation ; Particles Size Distribution ; Yttria-Stabilized Zirconia (YSZ) ; Reaction Parameters

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