Method for preparing nano-catalyst of Cu2+/TiO2-SiO2

A nano-catalyst, sol technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of complex photodeposition process, low activity and expensive equipment and other problems, to achieve the effect of reasonable process, low production cost and uniform particle distribution

Inactive Publication Date: 2006-05-10
TIANJIN UNIV
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  • Abstract
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Problems solved by technology

Hu Chun et al. reported in Catalysis Today 90 (2004) 325-330 that butyl titanate and silica gel were used as the main raw materials. 2 1% Cu was prepared by photodeposition under atmosphere 2+ / TiO 2 -SiO 2 Nano-catalysts, UV-Vis absorption spectrum peaks at 600-800nm, indicating that there is a certain absorption of visible light; but the process of photodeposition method is complicated, the equipment is expensive, it belongs to liquid phase photocatalysis technology, 1.5gCu 2+ / TiO 2 -SiO 2 The photocatalytic oxidation of 275ml of K-2G and CBX with a concentration of 20mg / L respectively only reached 30% and 60%, and the activity was relatively 2 -SiO 2 The 32% and 60% of 32% and 60% are not improved, so Cu is prepared by photodeposition 2+ / TiO 2 -SiO 2 High cost and low activity

Method used

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  • Method for preparing nano-catalyst of Cu2+/TiO2-SiO2
  • Method for preparing nano-catalyst of Cu2+/TiO2-SiO2
  • Method for preparing nano-catalyst of Cu2+/TiO2-SiO2

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Experimental program
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Effect test

Embodiment 1

[0016] Measure 20ml of absolute ethanol, 15ml of glacial acetic acid and 1.64ml of ethyl orthosilicate into the conical flask, mix evenly at 25°C, drop 8ml of deionized water into the conical flask at a rate of 5 drops / min, After dropping, stir at 60 rpm for 15 min to obtain transparent SiO 2 Sol. Weigh 10ml of butyl titanate and add SiO at a rate of 8 drops / min 2 In the sol, TiO was obtained after stirring at 60 rpm for 15 minutes after dropping. 2 -SiO 2 Sol. Then 2.94ml of copper nitrate solution (concentration is 0.5mol / L) was dripped into TiO at a rate of 5 drops / min. 2 -SiO 2 After the sol was dropped and stirred at 60 rpm for 40 minutes, the sol was allowed to stand in a natural state to obtain translucent Cu 2+ / TiO 2 -SiO 2 The gel was dried at room temperature for 48 hours, and then dried in a drying oven at 80°C for 36 hours. Finally, the dried Cu 2+ / TiO 2 -SiO 2 The dry gel is heated to 500°C in a muffle furnace, the heating voltage is 110V, the heatin...

Embodiment 2

[0019] Measure 18ml of absolute ethanol, 14ml of glacial acetic acid and 1.64ml of ethyl orthosilicate into the conical flask, mix evenly at 30°C, drop 7ml of deionized water into the conical flask at a rate of 5 drops / min, After dropping, stir at 80 rpm for 20min to obtain transparent SiO 2 Sol. Weigh 10ml of butyl titanate and add SiO at a rate of 8 drops / min 2 In the sol, after dropping and stirring for 20min, TiO 2 -SiO2 Sol. Then 2.94ml of copper nitrate solution (concentration is 0.5mol / L) was dripped into TiO at a rate of 5 drops / min. 2 -SiO 2 Sol, after dropping and stirring for 60min, leave the sol in a natural state to obtain translucent Cu 2+ / TiO 2 -SiO 2 The gel was dried at room temperature for 72 hours, and then dried in a drying oven at 80°C for 48 hours. Finally, the dried Cu 2+ / TiO 2 -SiO 2 The dry gel is heated to 500°C in a muffle furnace, the heating voltage is 110V, the heating rate is 5°C / min, and the temperature is kept at a constant tempera...

Embodiment 3

[0021] Measure 40ml of absolute ethanol, 30ml of glacial acetic acid and 3.28ml of ethyl orthosilicate into the conical flask, mix evenly at 20°C, drop 15ml of deionized water into the conical flask at a rate of 5 drops / min, After dropping, stir at 100 rpm for 10 min to obtain transparent SiO 2 Sol. Weigh 20ml of butyl titanate and add SiO at a rate of 8 drops / min 2 In the sol, TiO was obtained after stirring for 10 minutes after dropping 2 -SiO 2 Sol. Then 5.88ml of copper nitrate solution (concentration is 0.5mol / L) was dripped into TiO at a rate of 5 drops / min. 2 -SiO 2 Sol, after dropping and stirring for 30min, let the sol stand in a natural state to obtain translucent Cu 2+ / TiO 2 -SiO 2 The gel was dried at room temperature for 64 hours, and then dried in a drying oven at 80°C for 42 hours. Finally, the dried Cu 2+ / TiO 2 -SiO 2 The dry gel is heated to 500°C in a muffle furnace, the heating voltage is 110V, the heating rate is 5°C / min, and the temperature i...

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Abstract

The invention discloses a method for preparing nanometer catalyst of Cu2+ / TiO2-SiO2, belonging to the vapor phase photo-catalyst technique. Said method comprises: adding de-ionized water into the mixture of silicic acid n-hexanoic, alcohol, and acetic acid to be mixed and attaining the SiO2 sol; adding butyl titanate into SiO2 sol to be mixed to attain the TiO2-SiO2 sol; adding cupric nitrate solution to be mixed to attain the Cu2+ / TiO2-SiO2 sol, which is processed by drying, sintering and milling to attain the Cu2+ / TiO2-SiO2 catalyst at 10-15nm. The inventive Cu2+ / TiO2-SiO2 can realize the full-frequency absorption of visible light, to improve the optical quantum efficiency significantly, while the degradation rate of photo-catalysis dimethoxybenzene can reach more than 95%, with anatase crystal structure with high purity, uniform particle distribution, and larger specific surface. And the invention has reasonable process, simple producing processes, normal reaction conditions, and lower producing cost.

Description

technical field [0001] The present invention relates to a Cu 2+ / TiO 2 -SiO 2 The invention relates to a preparation method of a nanometer catalyst, which belongs to gas phase photocatalyst technology. Background technique [0002] In recent years, the use of TiO 2 The oxidative degradation of VOCs in the air by heterogeneous photocatalysis as a catalyst is a new technology for pollution control that has received increasing attention. In order to improve the TiO 2 The specific ways of surface modification include: deposition of noble metals, doping of transition metal ions, recombination of semiconductors, surface photosensitization, surface chelation and derivatization, etc. Hu Chun et al. reported in Catalysis Today 90 (2004) 325-330 that butyl titanate and silica gel were used as the main raw materials. 2 1% Cu was prepared by photodeposition under atmosphere 2+ / TiO 2 -SiO 2 Nano-catalysts, UV-Vis absorption spectrum peaks at 600-800nm, indicating that there is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01D53/86B01J21/06
Inventor 张国亮王贤亲张凤宝
Owner TIANJIN UNIV
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