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Preparation method of carbon-loaded palladium powder serving as formaldehyde remover

A technology of formaldehyde remover and carbon-supported palladium, which is applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of expensive plasma equipment, increase the cost of eliminating formaldehyde, and high energy consumption, and achieve a wide range of gas concentration in the treatment , The concentration of reactants is easy to control, and the effect of good solution stability

Inactive Publication Date: 2018-07-03
天津仁智科技发展有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

① Adsorption method is the most commonly used method to eliminate formaldehyde. This method uses strong adsorptive materials with large specific surface area to absorb formaldehyde. For example, the commonly used strong adsorptive materials with large specific surface area are porous carbon materials, activated carbon, layered clay, Molecular sieve, activated alumina, silica gel, etc. This method is simple, but its disadvantage is that the adsorption capacity of the adsorbent is limited and needs to be replaced regularly, which increases the cost of eliminating formaldehyde; Interaction produces non-volatile substances, thereby removing formaldehyde from the purification object. For example, formaldehyde reacts with hydroxylamine sulfate aqueous solution to generate non-volatile sulfuric acid and oxime, and formaldehyde reacts with imidazolidine to generate non-volatile substances. This method requires regular replacement of active substances , not only increase the cost of eliminating formaldehyde, but also produce new potential pollutants; ③ photocatalytic method is to use titanium dioxide catalyst to oxidize and eliminate formaldehyde. It is oxidized to the product of carbon dioxide and water. The excess oxygen in the product comes from the oxygen molecules activated by photoelectrons. The disadvantage of this method is that it is difficult to deal with a large amount of formaldehyde due to the influence of light conditions; However, ozone and nitrogen oxides may be generated during the process, and the plasma equipment is expensive and energy-consuming; ⑤The catalytic combustion method refers to the oxidation of formaldehyde by oxygen molecules to form water and carbon dioxide under the condition of a catalyst, the usual transition Metal oxides can catalyze the oxidation of formaldehyde, but the complete oxidation temperature of formaldehyde is closely related to the type of catalyst
Its specification discloses Pt / TiO 2 The catalyst can efficiently oxidize formaldehyde completely at room temperature, but the catalyst uses a higher loading of the noble metal Pt, which has a higher cost, and Pt as a catalyst is easily oxidized by SO in the air. 2 , NO 2 Pollution inactivation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In 10ml 2.5mmol PdCl 2 solution, add 2.5×10 -2 1 mmol of EDTA, stirred for 0.5 h, then added 22 mg of activated carbon carrier, and ultrasonically oscillated to obtain component A—a suspension of activated carbon;

[0025] Slowly add 10ml of 1% ammonia borane aqueous solution to component A at 15°C, ultrasonically oscillate or stir for 0.5 hours to make the reduction reaction between the metal salt and ammonia borane, so that the reduced Pd particles are adsorbed on the carbon carrier, and the obtained Component B;

[0026] Component B was washed with water several times, and dried under vacuum at 60° C. to obtain carbon-supported palladium powder used as a formaldehyde remover.

Embodiment 2

[0028] In 10ml 2.5mmol PdCl 2 solution, add 5×10 -2 1 mmol of EDTA, stirred for 0.5 h, then added 22 mg of activated carbon carrier, and ultrasonically oscillated to obtain component A—a suspension of activated carbon;

[0029] Slowly add 5ml of 1% ammonia borane aqueous solution to component A at 15°C, ultrasonically oscillate or stir for 3 hours, so that the metal salt and ammonia borane undergo a reduction reaction, so that the reduced Pd particles are adsorbed on the carbon carrier to obtain Component B;

[0030] Component B was washed with water for several times, and dried at 60° C. under the protection of nitrogen to obtain palladium powder on carbon used as a formaldehyde remover.

Embodiment 3

[0032] In 10ml 2.5mmol PdCl 2 solution, add 3.75×10 -2 1 mmol of EDTA, stirred for 0.5 h, then added 22 mg of activated carbon carrier, and ultrasonically oscillated to obtain component A—a suspension of activated carbon;

[0033] Slowly add 10ml of 1% ammonia borane aqueous solution to component A at room temperature, ultrasonically oscillate or stir for 3 hours, so that the metal salt and ammonia borane undergo a reduction reaction, so that the reduced Pd particles are adsorbed on the carbon carrier to obtain Component B;

[0034] Component B was washed with water several times, and dried under vacuum at 60° C. to obtain carbon-supported palladium powder used as a formaldehyde remover.

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Abstract

The invention discloses a preparation method of carbon-loaded palladium powder serving as a formaldehyde remover. According to the method, nanoparticles are formed on the surface of an activated carbon carrier by Pd by taking EDTA as a complexing agent and ammonia borane as a reducing agent. The carbon-loaded palladium powder serving as the formaldehyde remover has a very large catalytic specificsurface and relatively good performance and can catalyze formaldehyde to oxidize at about 40 DEG C to generate carbon dioxide and water. The carbon-loaded palladium powder is flexible in using mode and relatively wide in treatable gas concentration range, and can be combined with heaters and solar thermal collectors and the like to remove indoor formaldehyde efficiently.

Description

technical field [0001] The invention belongs to the technical field of materials used for air pollution control, and in particular relates to a preparation method of carbon-supported palladium powder used as a formaldehyde remover. Background technique [0002] Formaldehyde is a common pollutant in the indoor atmosphere, and it has high toxicity. Short-term exposure to low concentrations of formaldehyde can irritate the eyes and respiratory tract and cause allergic reactions, and long-term exposure to trace amounts of formaldehyde can increase the possibility of cancer. Formaldehyde has been identified as a teratogenic and carcinogenic substance by the World Health Organization. The "Indoor Air Quality Standard" (GB / T18883-2002), which was implemented in my country in 2003, stipulates that the maximum allowable concentration of formaldehyde in indoor air is 0.10 mg per cubic meter (1 hour average). [0003] At present, there are many ways to eliminate formaldehyde, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01D53/86B01D53/72
CPCB01J23/44B01D53/8668B01D2251/206B01D2255/1023B01D2257/704B01D2257/708B01D2258/06
Inventor 张俊维
Owner 天津仁智科技发展有限责任公司