Dissertation > Excellent graduate degree dissertation topics show

Preparation of Titania-Supported CoPc Using Sol-Gel and Photocatalytic Reduction of CO2

Author: LiuShaoHua
Tutor: WangZhiZhong
School: Taiyuan University of Technology
Course: Physical and chemical
Keywords: Sol - gel method . TiO2 CO2 CoPc Photocatalytic Reduction
CLC: O643.36
Type: Master's thesis
Year: 2007
Downloads: 242
Quote: 0
Read: Download Dissertation

Abstract


The CO 2 , CH 4 and other greenhouse gases are the main reasons that cause global warming. If able to greenhouse gas CO 2 conversion and fixed, the greenhouse effect, but also can alleviate CO 2 stored in the form of a carbon source, this will be a very meaningful. The use of sunlight on an aqueous solution of CO 2 Restore is a new photocatalytic technology research in recent years, because of their long-term needs consistent with sustainable development, so broad prospects. Known, CO 2 of carbon in the form of the highest valency, restore CO 2 requires a high energy or high activity of the catalyst. Many semiconductor photocatalyst titanium dioxide (TiO 2 ), non-toxic, inexpensive, good stability, high photocatalytic activity, caused widespread concern. However, of TiO 2 , a wide bandgap (3.2eV), and can use solar energy is only about 2% of total. For improve TiO 2 photocatalyst activity can usually be metal ion-doped semiconductor catalyst composite surface photosensitization other means. The active species in this experiment is a metal macrocyclic complexes of cobalt phthalocyanine (COPC), its thermal stability and chemical stability is very good, and good photoelectric properties, has a strong absorption in the visible range of the wavelength of 600 ~ 700nm. Application of sol - gel method to load in the same has the photoreduction nature of the semiconductor carrier TiO 2 prepared a high catalytic activity and wide response range can be used to restore the CO 2 photocatalyst. The main contents and conclusions are: 1. Tetrabutyl titanate as precursor, ethanol as solvent, acetic acid inhibitor, concentrated hydrochloric acid as a catalyst, cobalt phthalocyanine as the active species, the sol - gel was prepared CoPc / the TiO 2 < / sub> composite photocatalyst. Photocatalytic reduction of CO 2 efficiency metrics to study the amount of acetic acid, the amount of water, the amount of solvent, the amount of concentrated HCl, cobalt phthalocyanine (CoPc) loading, calcination temperature on CoPc / TiO photocatalytic activity of nano-particles in 2 , obtained laboratory preparation of nano CoPc / TiO 2 catalyst the optimum conditions are as follows: Ti (OC 4 < / sub> H 9 ) 4 : C 2 H 5 OH: HAc: H 2 < / sub> O = 1:4:2:2; without other organic solvents; titanate, n-butyl taken 0.04mol when the amount of concentrated hydrochloric acid to 0.5 mL; the CoPc load of 0.50 (wt)%; 400 ° C and calcined catalyst. 2. Prepared under optimum conditions CoPc / TiO 2 for CO 2 Photocatalytic reduction, by changing the reaction conditions, including: photocatalyst amount, the reaction solution of NaOH The concentration of electron donor Na 2 the SO 3 of the concentration, the reaction time of the photocatalytic give the better the reaction conditions: photocatalyst of CoPc / TiO 2 an amount of 0.25g; NaOH solution concentration of 0.15 mol / L; Na 2 SO 3 of a concentration of 0.1 mol / l; reaction time is 20H. Under the best conditions the CO 2 light catalytic reduction of the total the product amounted 1032μm/g-cat. 3. On the preparation of CoPc / TiO 2 powder were characterized using X-ray diffraction, BET surface area, UV - visible diffuse reflectance, TG - differential thermal means. The results showed that the sol - gel the catalyst CoPc successfully supported on TiO 2 surface; TiO prepared 2 and CoPc / TiO , 2 of The particle diameter of the nano and distribution, large specific surface area, crystal type mainly anatase. Moreover, the experiments are prepared CoPc / TiO 2 nano-particles in the lower temperature (400 ℃) appeared in 27.6% of rutile, the emergence of this \The activity has been greatly enhanced. In addition, Nano-CoPc / TiO 2 photocatalyst in the visible and ultraviolet region have strong absorption, the CoPc load extends TiO 2 light absorption region in visible light Next to complete the CO 2 photoreduction to provide a reference for the direct use of solar energy in the future.

Related Dissertations

  1. Studies on the Synthesis and Technology of Dipentaerythritol and Its Derivative,TQ223.164
  2. Preparation and Photocatalytic Properties for Water Decomposition of Titanate Photocatalyst,O643.36
  3. Preparation of Based on the Phenolic Resin of Activated Carbon and Adsorption-Photopcatalytical Character of Supported TiO2,TQ424.19
  4. Experimental Research on Influence of Coal Reburning Reaction Conditions on NO_x Reduction by Non-Catalytic Reduction of Ammonia,X701
  5. Research on Key Technologies of Automatic Steel Wire Galvanizing Production Line Based on Gas Reduction Method,TQ153.15
  6. Studies on Synthesis, Characterization and Properties of Fe-V Co-doped TiO2 Catalyst,O614.411
  7. The Drying of Tilapia Fillet Using Supercritical Carbon Dioxide,TS254.4
  8. Research and Implementation of the Conflict Resolution in Process Modeling of Magic Platform,TP311.5
  9. Investigation of Fabrication, Characterization and Property of Fuctional Titanium Dioxide Nanoporous Materials,TB383.1
  10. Investigation of Preparation and Properties of Ordered Porous TiO2,TB383.2
  11. Preparation and Performance of V2O5-WO3/MOx/Cordierite Catalyst Modified with Cu、Mn、Ce for DeNOx,X701
  12. Study on Properties of Ce、Co、Ni/V-W/TiO2 Modified by Composite Sol for Selective Catalytic Reduction,X701
  13. The Supercritical Carbon Dioxide Extraction and Functional Quality Evaluation of Camellia Seed Oil,TS225.16
  14. Theory of China’s Carbon Emissions and Strategy Research in Service Outsourcing,X321
  15. Influence of Nitrate Concentrations on the Production of N2, N2O, NO, and CO2 by Soil Cores During Anaerobic Incubation,X131.3
  16. Effects of Elevated CO2 on Vase Life of Cut Flowers and Investigation into Reproductive Barriers in Crosses of Flower Lotus (Nelumbo Nucifera),S682.11
  17. Based on Rough Set of Urban Areas When Traffic Green Control System Research,TP18
  18. Research on Obviate Measures of Continuous Cropping Obstacles of Rehmannia Glutionsa,S435.672
  19. Effects of Exogenous Spermidine on CO2 Assimilation and Metabolism of Salt-Stressed Cucumber Seedlings,S642.2
  20. The Effect of Reducing Fertilization on Yield and Quality of Greenhouse Tomato,S641.2
  21. Combination Degradation of Chlor Pyrifos Via Biodegradation and Photodegradation,X592

CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
© 2012 www.DissertationTopic.Net  Mobile