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Process for preparing nanometer gold catalysts adding modification agent

A catalyst and nano-gold technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem that it cannot play an effective role and cannot obtain nano-gold catalysts , to deal with complex problems, to achieve the effect of good activity and stability, simple process and good strength

Inactive Publication Date: 2010-09-15
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the pretreatment is more complicated, and at room temperature, it cannot play an effective role
However, if the gold is supported on a single carrier Al 2 o 3 In general, nano-gold catalysts with low-temperature activity are generally not available. If gold is supported on a single transition metal oxide, the prepared catalysts generally have considerable difficulties in the process of industrialization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Au / Fe with a weight ratio of 1:10:200 obtained by adopting the preparation method described in the patent CN 1498680A 2 o 3 / Al 2 o 3 Catalyst, the modifier triethylenediamine is added by gas phase adsorption method, the loading capacity is 0.3%, the preparation temperature is 100°C, the action time is 12 hours, the impregnated sample is dried at 120°C for 12 hours, and roasted at 300°C for 2 hours. Obtain nano-gold catalyst.

[0027] The raw gas composition is CO: 0.5%, O 2 : 21%, N 2 : 78.5% (volume percentage), gas volume space velocity is 10000h -1 , the nano-gold catalyst catalyzes the complete conversion of CO to CO 2 The allowable minimum reaction temperature is 55°C. At 20°C, the reaction was continued online for 50 hours, and the activity had no obvious tendency to decrease.

Embodiment 2

[0029] Au / Fe with a weight ratio of 1:10:200 obtained by adopting the preparation method described in the patent CN 1498680A 2 o 3 / Al 2 o 3 Catalyst, using the aqueous solution impregnation method to add the modifier picoline, the loading capacity is 5%, the preparation temperature is 25°C, the action time is 12 hours, the impregnated sample is dried at 120°C for 12 hours, and roasted at 400°C for 1 hour to obtain nano-gold catalyst.

[0030] The raw gas composition is CO: 0.5%, O 2 : 21%, N 2 : 78.5% (volume percentage), gas volume space velocity is 8000h -1 , the nano-gold catalyst catalyzes the complete conversion of CO to CO 2 The allowable minimum reaction temperature is 60°C. At 25°C, the reaction was continued online for 30 hours, and the activity had no obvious tendency to decrease.

Embodiment 3

[0032] Au / Al with a weight ratio of 1:100 obtained by the preparation method described in the patent 200610000633.8 (application number) 2 o 3 Catalyst, adding modifier D-vitamin C by spraying and impregnating method, the load is 1%, the preparation temperature is 50°C, the action time is 2 hours, the impregnated sample is dried at 120°C for 12 hours, and roasted at 300°C for 2 hours to obtain nano-gold catalyst.

[0033] The raw gas composition is CO: 0.5%, O 2 : 21%, N 2 : 78.5% (volume percentage), gas volume space velocity is 10000h -1 , the nano-gold catalyst catalyzes the complete conversion of CO to CO 2 The allowable minimum reaction temperature is 43°C. At 25°C, the reaction was continued online for 50 hours, and the activity had no obvious tendency to decrease.

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PUM

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Abstract

The invention is a method for preparing nanometer gold catalyst with modification agent added. Among picolines, triethylene diamine (TEDA), dextrose, dextrose+NaOH, sinistral vitaminC, dextral vitamin C, quinuclidine, quinoxalines or NaCN, one of the agents is mainly used as the modification agent. By adding the modification into supported nanometer gold catalyst, the modification agent can be used for shielding the direct contact between active ingredient and H2O and CO2 or evacuating in an isolated way the function of metal active ingredients, so that nanometer gold catalyst with high activity and stability can be prepared. The nanometer gold catalyst prepared by this method is of good CO-purifying activity and long service life at room temperature.

Description

technical field [0001] The present invention is a new preparation method, and the application scope of the nano-gold catalyst obtained by using the preparation method includes coal mine self-rescuer for preventing CO, escape mask for high-rise buildings, or other devices for protecting CO, CO 2 Lasers, CO sensors, and CO purification in some special or closed environments. Background technique [0002] The CO purification catalyst that has been used for a long time in the past is Hopcalite (Hopcalite agent). It was jointly invented by Johns Hopkins University and the University of California in 1919. It is a catalyst made of active manganese dioxide and copper oxide in a certain proportion. Usually the preparation method of Hopcalite catalyst is sulfuric acid method. The first step is to make active manganese dioxide, which is to mix manganese sulfate fine powder (below 70 mesh) with a small amount of water, and add concentrated sulfuric acid under constant stirring to mak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J31/02B01J37/02B01D53/62
Inventor 王东辉史喜成董同欣
Owner NO 63971 TROOPS PLA
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