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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
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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.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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