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Preparation method for nanogold particle loading CeO2-TiO2 composite catalyst

A technology of nano-gold particles and composite catalysts, which is applied in the field of catalysts, can solve problems such as limiting the application of photocatalytic technology, and achieve the effects of environmental friendliness, strong oxygen storage performance, and enhanced oxidation capacity

Inactive Publication Date: 2015-09-30
曾旭 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 It is a wide energy gap semiconductor, which can only absorb ultraviolet light with a wavelength of less than 380nm in sunlight, which limits the application of photocatalytic technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A CeO loaded with gold nanoparticles 2 -TiO 2 The preparation method of composite catalyst is, (1) 12mL water, 20mL glacial acetic acid (analytically pure), 0.78g hexahydrate cerium nitrate (analytical pure) and 50mL dehydrated alcohol (analytical pure) form a uniform solution under stirring at 40 ℃ Finally, slowly drop in 40% (volume fraction) tetrabutyl titanate (chemically pure) ethanol solution, form a sol under constant stirring, then raise the temperature to 60°C, continue stirring to slowly volatilize the solvent, and form a gel. After drying at ℃ for 24h, the obtained xerogel was calcined at 550℃ for 6h to obtain CeO 2 -TiO 2 Carrier (where CeO 2 The content of is 3wt%); (2) the CeO that will prepare 2 -TiO 2 Add 100mL of HAuCl to 1g of carrier 4 (4.2×10 -3 mol / L) and urea (0.42mol / L), stirred at 80°C for 4h, then centrifuged, washed, dried, and calcined at 300°C for 2h. Promptly obtain the CeO of a kind of loaded nano-gold particle of the present invent...

Embodiment 2

[0022] A CeO loaded with gold nanoparticles 2 -TiO 2 The preparation method of composite catalyst is, (1) after 15mL water, 25mL glacial acetic acid (analytically pure), 1g hexahydrate cerium nitrate (analytical pure) and 80mL dehydrated alcohol (analytical pure) are formed uniform solution under stirring at 40 ℃ , slowly drop into 40% (volume fraction) tetrabutyl titanate (chemically pure) ethanol solution, form a sol under constant stirring, then raise the temperature to 60°C, continue stirring to slowly volatilize the solvent and form a gel, at 80°C After drying for 24 h at low temperature, the obtained xerogel was calcined at 500 °C for 8 h to obtain CeO 2 -TiO 2 Carrier (where CeO 2 The content of is 5wt%); (2) the CeO that will prepare 2 -TiO 2 Add 150mL of HAuCl to 1g of carrier 4 (4.2×10 -3 mol / L) and urea (0.42mol / L), stirred at 80°C for 4h, then centrifuged, washed, dried, and calcined at 280°C for 2.5h. Promptly obtain the CeO of a kind of loaded nano-gold p...

Embodiment 3

[0024] A CeO loaded with gold nanoparticles 2 -TiO 2 The preparation method of composite catalyst is, (1) after 20mL water, 30mL glacial acetic acid (analytically pure), 2g cerium nitrate hexahydrate (analytical pure) and 100mL dehydrated alcohol (analytical pure) are formed under stirring at 40 ℃ , slowly drop into 40% (volume fraction) tetrabutyl titanate (chemically pure) ethanol solution, form a sol under constant stirring, then raise the temperature to 60°C, continue stirring to slowly volatilize the solvent and form a gel, at 80°C After drying for 24 hours at 600°C, the obtained xerogel was calcined at 600°C for 5 hours to obtain CeO 2 -TiO 2 Carrier (where CeO 2 The content of is 8wt%); (2) the CeO that will prepare 2 -TiO 2 Add 200mL of HAuCl to 2g of carrier 4 (4.2×10 -3 mol / L) and urea (0.42mol / L), stirred at 80°C for 4h, then centrifuged, washed, dried, and calcined at 320°C for 1.5h. Promptly obtain the CeO of a kind of loaded nano-gold particle of the pres...

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PUM

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Abstract

A preparation method for a nanogold particle loading CeO2-TiO2 composite catalyst comprises the following steps: (1) preparing a CeO2-TiO2 carrier by adopting a sol-gel method; (2) loading nanogold particles on the CeO2-TiO2 carrier. The nanoparticles prepared according to the preparation method are uniform in distribution and high in loading capacity, the preparation process is simple, the condition is mild, the environment is friendly, and no chemical reagent residual is generated. The nanogold particle loading CeO2-TiO2 composite catalyst product has an efficient catalysis effect, and can be applied to fields such as catalytic wet oxidation, motor vehicle exhaust catalytic purification, atmospheric pollutant catalytic degradation and sulfur dioxide catalytic elimination.

Description

technical field [0001] The present invention relates to catalyzer, relate in particular to a kind of CeO loaded nano-gold particle 2 -TiO 2 Preparation method of composite catalyst. Background technique [0002] In 1972, Japan's Fujishima and Honda discovered TiO 2 Single crystal electrodes can realize photocatalytic splitting of water to produce hydrogen. When a semiconductor photocatalytic material is irradiated by light with an energy equal to or higher than its own forbidden band width, the electrons in the crystal are excited to transition from the valence band to the conduction band, and free electrons and holes are formed in the conduction band and valence band respectively. , and migrate from the interior of the semiconductor to the surface. The photogenerated electrons have a strong reducing ability, and the photogenerated holes have a strong oxidizing ability. 2 In the presence of O, it can be obtained from H 2 Capture electrons from O and release O 2 . Bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66
Inventor 曾旭
Owner 曾旭
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