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Method for preparing copper-based nano-catalyst with different valence states

A technology of nano-catalyst and preparation method, which is applied in the field of preparation of CuOx/γ-Al2O3 nano-catalyst, which can solve the problems such as low-valence copper species are not easy to preserve, and achieve the effects of low pollution, cheap and easy-to-obtain raw materials, and excellent catalytic performance

Inactive Publication Date: 2015-05-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low-valence copper species involved in these studies are all obtained through complex post-processing methods, and the low-valence copper species obtained in this way are not easy to preserve, and are oxidized to high-valence copper species when exposed to air.

Method used

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  • Method for preparing copper-based nano-catalyst with different valence states
  • Method for preparing copper-based nano-catalyst with different valence states
  • Method for preparing copper-based nano-catalyst with different valence states

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1. CuO Containing Specific Valence State Copper Species x / γ-Al 2 o 3 Determination of Calcination Temperature of Nano-catalyst

[0024] Accurately weigh 0.1339g Cu(CH 3 COO) 2 ·H 2 O was ultrasonically dissolved in 30ml distilled water, and then accurately weighed 1.0000g γ-Al 2 o 3 (BET=134.1 m 2 / g) added to the above solution (Cu x+ The loading is 0.5mmol Cu x+ / 100m 2 γ-Al 2 o 3 ), stirred magnetically at room temperature for 3 hours, then evaporated to dryness in a 90°C oil bath, and finally dried in an oven at 100°C for 12 hours. / min of high-purity N 2 The TG-DTA test was carried out at a heating rate of 2 °C / min under the atmosphere, and the results are shown in Table 1 and attached figure 1 . h 2 -TPR results (mainly hydrogen consumption) further support TG-DTA and XRD results.

[0025] Table 1. Prepared Cu(CH 3 COO) 2 ·H 2 O / γ-Al 2 o 3 TG-DTA Weight Loss of Nanocatalyst Precursor

[0026] temperature (°C) product T...

Embodiment 2

[0029] Example 2. CuO / γ-Al 2 o 3 Preparation of nanocatalysts

[0030] Accurately weigh 0.2677g Cu(CH 3 COO) 2 ·H 2 O was ultrasonically dissolved in 30ml distilled water, and then accurately weighed 2.0000g γ-Al 2 o 3 (BET=134.1 m 2 / g) was added to the above solution, stirred magnetically at room temperature for 3 hours, then evaporated to dryness with a 90°C oil bath, and finally dried in a 100°C oven for 12 hours, after grinding evenly, it was heated at 2°C / min under an air atmosphere of 100ml / min. The heating rate of min was raised to 450°C for 2 hours to obtain CuO / γ-Al 2 o 3 Nanocatalyst samples (Cu 2+ The loading is 0.5mmol Cu 2+ / 100m 2 γ-Al 2 o 3 ), its XRD, H 2 -TPR results are attached figure 2 with 3 .

Embodiment 3

[0031] Example 3. Cu 2 O / γ-Al 2 o 3 Preparation of nanocatalysts

[0032] Accurately weigh 0.2677g Cu(CH 3 COO) 2 ·H 2 O was ultrasonically dissolved in 30ml distilled water, and then accurately weighed 2.0000g γ-Al 2 o 3 (BET=134.1 m 2 / g) was added to the above solution, stirred magnetically at room temperature for 3 hours, then evaporated to dryness in an oil bath at 90°C, and finally dried in an oven at 100°C for 12 hours. 2 Under the atmosphere, the temperature was raised to 360 °C for 2 hours at a heating rate of 2 °C / min to obtain Cu 2 O / γ-Al 2 o 3 Nanocatalyst samples (Cu + The loading is 0.5mmol Cu + / 100m 2 γ-Al 2 o 3 ), its XRD, H 2 -TPR results are attached figure 2 with 3 .

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Abstract

The invention discloses a method for preparing a copper-based CuOx / gamma-Al2O3 nano-catalyst containing specific valence states. The method comprises the following steps of: ultrasonically dissolving 0.2677g of Cu(CH3COO)2.H2O in 30ml of distilled water, accurately weighing 2.0000g of gamma-Al2O3 (BET=134.1m<2> / g) and adding the gamma-Al2O3 into the solution, and magnetically stirring at room temperature for three hours; drying the moisture by distillation by using an oil bath at 90 DEG C; and finally, drying in an oven at 100 DEG C for twelve hours, uniformly grinding, raising the temperature to 360 DEG C, 420 DEG C and 480 DEG C at a temperature rise rate of 2 DEG C / min under 100ml / min high-purity N2 atmosphere, roasting for two hours, sequentially obtaining samples of a Cu2O / gamma-Al2O3 nano-catalyst, a Cu2O-Cu / gamma-Al2O3 nano-catalyst and a Cu / gamma-Al2O3 nano-catalyst, wherein Cux plus the load amount is equal to 0.5mmol Cux+ / 100m<2>gamma-Al2O3. The preparation method has the advantages that the raw materials are readily available, the preparation program is easy and convenient, special equipment requirements are avoided, and the catalyst is high in catalytic activity and has potential industrial application prospect.

Description

technical field [0001] The present invention relates to a class of CuO with specific valence copper species x / γ-Al 2 o 3 The invention discloses a preparation method and application of a nanometer catalyst, belonging to the technical field of three-way catalysis. Background technique [0002] With the development of industry, the number of cars in various countries in the world is increasing year by year. While automobiles bring convenience to people, their tail gas pollution also causes great harm to the atmospheric environment and human health. The control of motor vehicle exhaust pollution has become one of the important factors to improve urban air quality, and it is a global problem that needs to be solved urgently. Coupled with the increasing awareness of environmental protection, countries around the world are formulating or have issued more stringent regulations on motor vehicle exhaust emissions. regulations. After in-depth research by many researchers, a cons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/72
Inventor 董林姚小江汤常金高飞
Owner NANJING UNIV