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Pd/Al2O3 catalyst prepared by adopting spraying method and application of Pd/Al2O3 catalyst in catalytically reducing bromate in water

A technology of catalyst and spray method, which is applied in the direction of reduced water/sewage treatment, etc., to achieve the effect of easy industrial production, simple operation and waste reduction

Inactive Publication Date: 2015-03-25
ZHANGJIAGANG GREEN TECH ENVIRONMENTAL PROTECTION EQUIP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are still being improved, and a set of good methods recognized by everyone has not yet been formed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 5 milliliters of concentrated hydrochloric acid and 1 gram of palladium chloride to 95 milliliters of water, and sonicate for 10 minutes, at which point the palladium chloride is completely dissolved. Take an Al with a diameter of 0.5 mm 2 o 3 120 grams are placed in a rotatable drum that rotates at 20 revolutions per minute. Take 50 milliliters of palladium chloride hydrochloric acid solution and put it in a glass spray bottle, spray it on the alumina, and spray the 50 milliliters of palladium chloride solution within 1 hour. After spraying, the alumina was taken out and dried in an oven at 120°C for 30 minutes.

[0040] Then take 50 ml of palladium chloride hydrochloric acid solution and repeat the above steps. After the spraying is completed, the catalyst precursor is dried at 120°C for 12 hours, calcined at 450°C for 2 hours, and finally reduced with hydrogen at 300°C for 1 hour to obtain the load. 0.5 wt% Pd / Al with a diameter of 0.5 mm 2 o 3 Catalyst abou...

Embodiment 2

[0042] Add 500 milliliters of concentrated hydrochloric acid and 200 grams of palladium chloride to 9.5 liters of water, and sonicate for 10 minutes, at which point the palladium chloride is completely dissolved. Take 12 kg of Al with a diameter of 0.1 mm 2 o 3 Placed in a rotatable drum and rotated at a speed of 20 rpm. Take 5 liters of palladium chloride hydrochloric acid solution and put it in a glass spray bottle and spray it on the alumina. The 5 liters of palladium chloride solution should be sprayed within 1 hour. After spraying, the alumina was taken out and dried in an oven at 120°C for 30 minutes.

[0043] Then take 5 liters of palladium chloride hydrochloric acid solution and repeat the above steps. After the spraying is completed, the catalyst precursor is dried at 120°C for 12 hours, calcined at 450°C for 2 hours, and finally reduced with hydrogen at 300°C for 1 hour to obtain the load. 1 wt% Pd / Al with a diameter of 0.1 mm 2 o 3 Catalyst 12 kg.

Embodiment 3

[0045] Pd / Al with a diameter of 0.5 mm is filled in a glass tube with a length of 25 cm and an inner diameter of 23.4 mm 2 o 3 For the catalyst, the packing height is 23.4 cm, and the length-to-diameter ratio of the part where the catalyst is packed is 10:1. Both ends of the glass tube are filled with PP cotton to prevent the catalyst from flowing out with the water.

[0046] Use a small self-priming pump to pump the bromate-containing solution and hydrogen into the catalyst column for bromate reduction.

[0047] a. When the concentration of bromate in the water is 10 mg / liter, and the water flow rate is 100 bed volumes / hour (i.e. 1 liter / hour), the selected hydrogen flow rate is 100 milliliters / hour, and bromate in the effluent is now The concentration is 300 μg / L.

[0048] b. When the concentration of bromate in water is 3 mg / liter, and the water flow rate is 100 bed volumes / hour (i.e. 1 liter / hour), the selected hydrogen flow rate is 100 ml / hour, and bromate in the efflu...

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PUM

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Abstract

The invention belongs to the technical field of ecomaterials, and particularly relates to a Pd / Al2O3 catalyst prepared b adopting a spraying method and application of the Pd / Al2O3 catalyst in catalytically reducing bromate in water. The Pd / Al2O3 catalyst is prepared by adopting the following steps: preparing a hydrochloric acid solution of palladium chloride, wherein the concentration of the hydrochloric acid solution is 1g / L to 100g / L, and the concentration of hydrochloric acid is 40ml / L to 80ml / L; carrying out the primary spraying after the palladium chloride is completely dissolved, uniformly spraying the palladium chloride solution onto the surface of aluminum oxide by utilizing a spraying device under the stirring condition to obtain a catalyst, drying the catalyst for 20 to 40 minutes at the temperature of 100 to 150 DEG C after the palladium chloride solution is uniformly sprayed, and carrying out the secondary spraying; drying the catalyst for 10 to 15 hours at the temperature of 100 to 150 DEG C after the secondary spraying; and calcining a precursor of the catalyst for 1 to 3 hours after twice spraying at the temperature of 400 to 500 DEG C, and then reducing the precursor of the catalyst by utilizing hydrogen at the temperature of 200 to 400 DEG C to obtain the Pd / Al2O3 catalyst. The catalyst prepared by adopting the spraying method has advantages that active ingredient palladium of the catalyst is concentrated on the surface of aluminum oxide particles, and the performance of the catalyst can be relatively efficiently played.

Description

technical field [0001] The invention belongs to the technical field of environmental materials, in particular to a spray method for preparing Pd / Al 2 o 3 Catalyst and its use in the catalytic reduction of bromate in water. Background technique [0002] With the increasing water pollution, the traditional water treatment process has been difficult to meet people's requirements. In order to ensure the safety and reliability of drinking water, water treatment technology is also slowly moving forward. In the process of drinking water treatment, disinfection is one of the key processes. As the first generation of drinking water disinfection method, chlorination disinfection is still adopted by most developing countries. However, people have noticed various disadvantages of chlorination disinfection, such as the production of other halogenated by-products such as trihalomethanes, which are mutagenic and carcinogenic, and pose a threat to human health. As a second-generation di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44C02F1/70
Inventor 尚建库孙武珠李琦徐正超
Owner ZHANGJIAGANG GREEN TECH ENVIRONMENTAL PROTECTION EQUIP
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