CN113578374A - Peculiar smell removing catalyst and preparation method and application thereof - Google Patents

Peculiar smell removing catalyst and preparation method and application thereof Download PDF

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CN113578374A
CN113578374A CN202110869820.4A CN202110869820A CN113578374A CN 113578374 A CN113578374 A CN 113578374A CN 202110869820 A CN202110869820 A CN 202110869820A CN 113578374 A CN113578374 A CN 113578374A
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catalyst
carrier
active component
molecular sieve
transition metal
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冯聪
刘智
张留广
钱晓林
曲绍鹤
张艳鹤
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Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
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Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/08—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
    • B01J29/10—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y containing iron group metals, noble metals or copper
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    • B01J29/126—Y-type faujasite
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8603—Removing sulfur compounds
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
    • B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
    • B01J29/74—Noble metals
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    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/0201—Impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/306—Organic sulfur compounds, e.g. mercaptans
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
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    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/10—After treatment, characterised by the effect to be obtained
    • B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
    • B01J2229/186—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself not in framework positions

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Abstract

The invention relates to the technical field of catalysts, and discloses an odor-removing catalyst, and a preparation method and application thereof. The catalyst comprises a carrier and an active component loaded on the carrier, wherein the carrier is selected from at least one of honeycomb ceramics and honeycomb metal plates, and the content weight ratio of the carrier to the active component in the catalyst is 1: 0.05-0.35; the active ingredients comprise the following components in percentage by weight: 0.1-0.5: 0.005-0.02 of a first active ingredient, a second active ingredient and a third active ingredient. The catalyst provided by the invention can be used for catalytically decomposing odor gases such as trimethylamine, methyl mercaptan, ammonia gas and formaldehyde under the conditions of a high-voltage electric field and normal temperature, and the efficiency of removing the odor gases is high.

Description

Peculiar smell removing catalyst and preparation method and application thereof
Technical Field
The invention relates to the technical field of catalysts, in particular to a peculiar smell removal catalyst and a preparation method and application thereof.
Background
In narrow spaces such as refrigerators, automobiles, storage cabinets, shoe cabinets and the like, gas circulation is not smooth, unpleasant smell is often generated, bacteria and mold are easy to breed in a humid environment, and daily life and health of people are seriously affected.
Currently, the deodorizing effect is achieved by using ozone generated by an ozone generator, and purification devices using ultraviolet lamps and photocatalytic decomposition technology are used.
On one hand, the technologies of the ozone generator, the ultraviolet lamp, the photocatalyst and the like need a specific device to occupy larger space, so that the corresponding installation of the generator and the ultraviolet lamp can be realized; and people can easily cause diseases of skin or respiratory system under the exposure of ozone and ultraviolet rays, especially the harm to people caused by over-standard ozone is great, and the application scene of the technology is difficult to expand due to the limitation.
At present, the main current practice for removing pollutants (peculiar smell) in indoor air is to use an adsorption method and use porous materials such as activated carbon and the like to adsorb harmful substances such as formaldehyde and the like in the air.
However, the method only adsorbs harmful substances and cannot degrade the harmful substances; meanwhile, the activated carbon can only treat harmful substances in indoor air, cannot treat the harmful substances which are mixed in indoor materials and slowly released, and is easy to saturate and inactivate after being adsorbed for a certain time and needs to be frequently replaced.
CN105435555A discloses a car removesThe method for removing the odor comprises the following steps of: A) 1% -10% of silver and palladium, wherein the molar ratio of the silver to the palladium is 2: 5; B) 5% -15% of Ce-doped V2O5/(MoO3)x(WO3)1-xWith TiO2Mixture of Ce: V2O5/(MoO3)x(WO3)1-x：TiO2The molar ratio of (a) to (b) is 0.25:1:2, and the titanium dioxide is in the anatase crystal form, and x is 0.1-0.5; C) the balance being ZSM-5 molecular sieve. However, this method must be carried out in a closed space at a temperature of 40 to 70 ℃ and has a poor purification effect.
Disclosure of Invention
The invention aims to solve the problem that the peculiar smells such as trimethylamine, methyl mercaptan, ammonia gas, formaldehyde and the like in the indoor space cannot be removed simultaneously in the prior art.
In order to achieve the above object, a first aspect of the present invention provides an odor eliminating catalyst comprising a carrier and an active ingredient supported on the carrier, wherein the carrier is at least one selected from the group consisting of a honeycomb ceramic and a honeycomb metal plate, and the content ratio by weight of the carrier to the active ingredient in the catalyst is 1: 0.05-0.35; the active ingredients comprise the following components in percentage by weight: 0.1-0.5: 0.005-0.02 of a first active component, a second active component and a third active component, wherein the first active component is a molecular sieve and/or modified alumina, the second active component is a transition metal oxide, and the third active component is nano-scale platinum and/or nano-scale palladium.
In a second aspect, the present invention provides a method for preparing an odor-reducing catalyst, the method comprising:
(1) contacting a carrier, a first active ingredient and a salt solution of a transition metal to carry out a first impregnation to obtain a first solid impregnation; the first active ingredient is a molecular sieve and/or modified alumina;
(2) sequentially carrying out first drying and first roasting on the first solid impregnation to obtain a catalyst intermediate;
(3) carrying out second impregnation on the catalyst intermediate and a salt solution containing a third active ingredient to obtain a second solid impregnation; the third active component is nano platinum and/or nano palladium;
(4) carrying out second drying and second roasting on the second solid impregnation in sequence;
wherein the carrier is selected from at least one of honeycomb ceramics and honeycomb metal plates;
controlling the dosage of the carrier so that the weight ratio of the carrier to the sum of the total amount of the first active ingredient, the transition metal oxide and the third active ingredient in the obtained odor-removing catalyst is 1: 0.05-0.35;
controlling the dosage of the salt solution of the transition metal and/or the salt solution containing the third active component, so that the weight ratio of the first active component, the transition metal oxide and the third active component in the obtained deodorization catalyst is 1: 0.1-0.5: 0.005-0.02.
In a third aspect, the invention provides an odour-reducing catalyst obtainable by the process of the second aspect.
A fourth aspect of the invention provides the use of an odour-reducing catalyst as described in the first and third aspects in an air cleaning apparatus.
The catalyst provided by the invention is applied to an air purification device, can be used for catalytically decomposing odor gases such as trimethylamine, methyl mercaptan, ammonia gas, formaldehyde and the like under the conditions of a high-voltage electric field and normal temperature, and is high in efficiency in removing the odor gases.
The inventor also finds that the catalyst provided by the invention can continuously catalyze and decompose harmful gases, and the service life of the air purification device is prolonged.
Drawings
FIG. 1 is a schematic representation of the odor eliminating catalyst prepared in example 1.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
It should be noted that, in various aspects of the present invention, the present invention is described only once in one aspect thereof without repeated description with respect to the same components in the aspects, and those skilled in the art should not be construed as limiting the present invention.
In the present invention, unless otherwise specified, the room temperature or the room temperature both represent 25. + -. 2 ℃.
As described above, the first aspect of the present invention provides an odor eliminating catalyst comprising a carrier selected from at least one of honeycomb ceramics and honeycomb metal plates, and an active ingredient supported on the carrier, wherein the content ratio by weight of the carrier to the active ingredient in the catalyst is 1: 0.05-0.35; the active ingredients comprise the following components in percentage by weight: 0.1-0.5: 0.005-0.02 of a first active component, a second active component and a third active component, wherein the first active component is a molecular sieve and/or modified alumina, the second active component is a transition metal oxide, and the third active component is nano-scale platinum and/or nano-scale palladium.
Preferably, the content weight ratio of the first active ingredient, the second active ingredient and the third active ingredient is 1: 0.1-0.3: 0.01-0.015. The inventors found that in this preferable case, the obtained catalyst has more excellent catalytic efficiency.
Preferably, the content weight ratio of the carrier to the active ingredient in the catalyst is 1: 0.1-0.2. The inventors have found that an odor removing catalyst having higher catalytic efficiency can be obtained by employing the embodiment in the preferred case.
According to a particularly preferred embodiment, in the catalyst, the content weight ratio of the carrier, the first active ingredient, the second active ingredient and the third active ingredient is 1: 0.05-0.3: 0.01-0.05: 0.0005 to 0.002, preferably 1: 0.1-0.3: 0.01-0.03: 0.001-0.0015.
The invention has no limitation on the pore structure of the carrier, and the number of the pores per unit cross section is only required to be 50-400 meshes, preferably 100-400 meshes, and the pore structure of the carrier can be a square, triangular, hexagonal or other special-shaped structure by way of example.
According to a particularly preferred embodiment, the honeycomb ceramic is selected from at least one of cordierite, mullite, alumina, silicon carbide.
Preferably, the molecular sieve is at least one selected from ZSM-5 molecular sieve, BETA molecular sieve and Y type molecular sieve.
Preferably, the transition metal oxide is at least one selected from the group consisting of cerium oxide, titanium dioxide, manganese oxide, copper oxide, cobalt oxide, chromium oxide, and iron oxide.
As described above, the second aspect of the present invention provides a method for preparing an odor eliminating catalyst, the method comprising:
(1) contacting a carrier, a first active ingredient and a salt solution of a transition metal to carry out a first impregnation to obtain a first solid impregnation; the first active ingredient is a molecular sieve and/or modified alumina;
(2) sequentially carrying out first drying and first roasting on the first solid impregnation to obtain a catalyst intermediate;
(3) carrying out second impregnation on the catalyst intermediate and a salt solution containing a third active ingredient to obtain a second solid impregnation; the third active component is nano platinum and/or nano palladium;
(4) carrying out second drying and second roasting on the second solid impregnation in sequence;
wherein the carrier is selected from at least one of honeycomb ceramics and honeycomb metal plates;
controlling the dosage of the carrier so that the weight ratio of the carrier to the sum of the total amount of the first active ingredient, the transition metal oxide and the third active ingredient in the obtained odor-removing catalyst is 1: 0.05-0.35;
controlling the dosage of the salt solution of the transition metal and/or the salt solution containing the third active component, so that the weight ratio of the first active component, the transition metal oxide and the third active component in the obtained deodorization catalyst is 1: 0.1-0.5: 0.005-0.02.
In the present invention, the average particle diameter of the nano-sized platinum is 1 to 20nm unless otherwise specified.
In the present invention, the average particle diameter of the nanosized palladium is 1 to 20nm unless otherwise specified.
Preferably, in step (1), the conditions of the first impregnation include at least: the temperature is 50-90 ℃ and the time is 2-10 hours.
Preferably, in step (1), the number of pores per unit cross-section in the carrier is 50-400 mesh, more preferably 100-400 mesh.
Preferably, in the step (1), the molecular sieve is at least one selected from the group consisting of a ZSM-5 molecular sieve, a BETA molecular sieve, and a Y-type molecular sieve.
Preferably, in step (1), the transition metal is selected from at least one of cerium, titanium, manganese, copper, cobalt, chromium, and iron.
Preferably, in the step (1), the salt solution of the transition metal is at least one of an aqueous solution of a nitrate of the transition metal, an aqueous solution of an acetate of the transition metal, and a halide of the transition metal.
According to a particularly preferred embodiment, in step (1), the salt solution of the transition metal is at least one selected from the group consisting of cerium nitrate, copper nitrate, manganese nitrate, copper nitrate, cobalt nitrate, chromium nitrate, iron nitrate, cerium chloride, titanium tetrachloride, manganese chloride, copper chloride, cobalt chloride, chromium chloride, iron chloride, cerium acetate, manganese acetate, copper acetate, cobalt acetate, and chromium acetate.
Preferably, in step (2), the conditions of the first drying include at least: the temperature is 100 ℃ and 130 ℃, and the time is 2-5 hours.
Preferably, in the step (2), the conditions of the first firing at least include: the temperature is 350-650 ℃, and the time is 2-10 hours.
Preferably, in step (3), the conditions of the second impregnation include at least: the temperature is 50-90 ℃ and the time is 2-10 hours.
Preferably, in the step (3), the salt solution containing the third active ingredient is at least one selected from chloroplatinic acid, platinum nitrate, palladium nitrate, and palladium chloride.
Preferably, in step (4), the conditions of the second drying include at least: the temperature is 100 ℃ and 130 ℃, and the time is 2-5 hours.
Preferably, in the step (4), the conditions of the second firing at least include: the temperature is 350-650 ℃, and the time is 2-10 hours.
As mentioned above, the third aspect of the present invention provides the odour-reducing catalyst prepared by the method of the second aspect.
As mentioned above, a fourth aspect of the present invention provides the use of the odour removal catalyst of the first and third aspects in an air cleaning device.
In the present invention, the deodorizing catalyst may be used to remove odor (pollutants) from indoor spaces, for example, but not limited to, interior spaces such as refrigerators, cars, lockers, shoe cabinets, etc.
The present invention will be described in detail below by way of examples. In the following examples, various raw materials used are commercially available ones unless otherwise specified.
Honeycomb ceramics: cordierite, having a 100 mesh pore size per unit cross-section (per square inch), available from Yixing prince ceramics, Inc.;
honeycomb ceramics: silicon carbide, having a mesh size of 100 mesh per unit cross-section (per square inch) of pores, available from Yixing prince ceramics, Inc.;
ZSM-5 molecular sieve: the trade name is ZSM-5X, purchased from new Tianyi materials Co., Ltd, south of lake;
BETA molecular sieve: the mark is BETA-30, and is purchased from Shandong China functional materials GmbH;
y-type molecular sieve: the brand is NAY, purchased from Zhuran environmental protection science and technology (Dalian) Co., Ltd;
cerium nitrate, titanium tetrachloride and chloroplatinic acid are all analytical reagents.
Example 1
This example provides a method for preparing an odor-reducing catalyst, comprising the steps of:
(1) dissolving 10g of Y-type molecular sieve and 5.68g of cerium nitrate in 100g of water, and soaking 100g of cordierite for 4 hours at 60 ℃ to obtain a first solid soaked substance;
(2) drying the first solid impregnate in air at 110 ℃ for 3 hours to obtain a dried first solid impregnate, followed by calcining in air at 400 ℃ for 3 hours to obtain a catalyst intermediate;
(3) dissolving 0.397g of chloroplatinic acid in 100g of water at 60 ℃, and then immersing the catalyst intermediate in the chloroplatinic acid aqueous solution for 2 hours to obtain a second solid impregnated matter;
(4) drying the second solid impregnate in 110 deg.C air for 3 hr to obtain dried second solid impregnate, and calcining in 400 deg.C air for 3 hr to obtain odor removing catalyst S1;
the carrier in the odor-removing catalyst S1 is cordierite, the first active component is a Y-type molecular sieve, the second active component is cerium oxide, and the third active component is nano-platinum with the average particle size of 10 nm; wherein the weight ratio of cordierite to the sum of the total amount of the Y-type molecular sieve, cerium oxide and nano-scale platinum is 1: 0.1315, the weight ratio of the Y-type molecular sieve, cerium oxide and nano-platinum is 1: 0.3: 0.015.
example 2
This example provides a method for preparing an odor-reducing catalyst, comprising the steps of:
(1) dissolving 10g BETA molecular sieve and 7.11g titanium tetrachloride in 100g water, and soaking 100g silicon carbide at 60 deg.C for 4 hr to obtain a first solid soaking substance;
(2) drying the first solid impregnate in air at 110 ℃ for 3 hours to obtain a dried first solid impregnate, followed by calcining in air at 400 ℃ for 3 hours to obtain a catalyst intermediate;
(3) dissolving 0.397g of chloroplatinic acid in 100g of water at 60 ℃, and then impregnating the above catalyst intermediate in the aqueous solution for 2 hours to obtain a second solid impregnation;
(4) drying the second solid impregnate in 110 deg.C air for 3 hr to obtain dried second solid impregnate, and calcining in 400 deg.C air for 3 hr to obtain odor removing catalyst S2;
in the odor removing catalyst S2, the carrier is silicon carbide, the first active component is BETA molecular sieve, the second active component is titanium dioxide, and the third active component is nano-grade platinum with average particle diameter of 10 nm; wherein the weight ratio of the silicon carbide to the sum of the total amount of the BETA molecular sieve, the titanium dioxide and the nano platinum is 1: 0.1315, the weight ratio of BETA molecular sieve, titanium dioxide and nano platinum is 1: 0.3: 0.015.
example 3
This example provides a method for preparing an odor-reducing catalyst, comprising the steps of:
(1) dissolving 10g of Y-type molecular sieve and 5.68g of cerium nitrate in 100g of water, and soaking 100g of cordierite for 4 hours at 60 ℃ to obtain a first solid soaked substance;
(2) drying the first solid impregnate in 110 ℃ air for 3 hours to obtain a dried first solid impregnate, followed by calcining in 400 ℃ air for 3 hours to obtain a catalyst intermediate;
(3) dissolving 0.265g of chloroplatinic acid in 100g of water at 60 ℃, and then impregnating the catalyst intermediate in the aqueous solution for 2 hours to obtain a second solid impregnated matter;
(4) drying the second solid impregnate in 110 deg.C air for 3 hr to obtain dried second solid impregnate, and calcining in 400 deg.C air for 3 hr to obtain odor removing catalyst S3;
the carrier in the odor-removing catalyst S3 is cordierite, the first active component is a Y-type molecular sieve, the second active component is cerium oxide, and the third active component is nano-platinum with the average particle size of 10 nm; the weight ratio of cordierite to the sum of the total dosage of the Y-type molecular sieve, the cerium oxide and the nano platinum is 1: 0.1301, the weight ratio of the Y-type molecular sieve, cerium oxide and nano-platinum is 1: 0.3: 0.01.
example 4
This example prepared an odor reducing catalyst according to the method of example 3 except that, in step (1), 5.68g of cerium nitrate was replaced with 8.52g of cerium nitrate.
The remaining procedure was the same as in example 3.
Obtaining the peculiar smell removal catalyst S4, wherein the weight ratio of the Y-type molecular sieve, the cerium oxide and the nano platinum is 1: 0.45: 0.01.
example 5
This example prepared an odor eliminating catalyst according to the method of example 3, except that 0.265g of chloroplatinic acid was replaced with 0.53g of chloroplatinic acid in step (3).
The remaining procedure was the same as in example 3.
Obtaining the peculiar smell removal catalyst S5, wherein the weight ratio of the Y-type molecular sieve, the cerium oxide and the nano platinum is 1: 0.3: 0.02.
example 6
This example prepared an odor eliminating catalyst according to the method of example 3 except that in step (1), 46g of cordierite was used in place of 100g of cordierite.
The remaining procedure was the same as in example 3.
Obtaining the odor-removing catalyst S6, wherein the weight ratio of the carrier cordierite to the active component is 1: 0.35.
comparative example 1
This comparative example prepared an odor removing catalyst according to the method of example 3 except that, in step (1), 11.53g of cerium nitrate was used in place of 5.68g of cerium nitrate.
The remaining procedure was the same as in example 3.
Obtaining the odor-removing catalyst DS1, wherein the weight ratio of the Y-type molecular sieve, the cerium oxide and the nano-scale platinum is 1: 0.6: 0.01.
comparative example 2
This comparative example prepared an odor-reducing catalyst according to the method of example 3, except that 0.795g of chloroplatinic acid was used in step (1).
The remaining procedure was the same as in example 3.
Obtaining the odor-removing catalyst DS2, wherein the weight ratio of the Y-type molecular sieve, the cerium oxide and the nano-scale platinum is 1: 0.3: 0.03.
comparative example 3
This comparative example prepared an odor eliminating catalyst according to the method of example 3, except that 32.2g of cordierite was used in the step (1).
The remaining procedure was the same as in example 3.
Obtaining the odor-removing catalyst DS3, wherein the weight ratio of the carrier cordierite to the active component is 1: 0.5.
comparative example 4
This comparative example prepared an odor eliminating catalyst according to the method of example 3, except that, in step (1), 10g of Y-type molecular sieve, 5.68g of cerium nitrate and 0.265g of chloroplatinic acid were dissolved in 100g of water, and 100g of cordierite was impregnated at 60 ℃ for 4 hours to obtain a first solid impregnation, i.e., the second impregnation, the second drying and the second calcination were not performed in this comparative example.
The remaining procedure was the same as in example 3. The odor-removing catalyst DS4 is obtained.
Test example
The odor removing catalyst prepared in the examples and the comparative examples is used for treating the odor in the indoor space at 30m3In a sealed test chamber, testing is carried out according to a test method of GB/T18801-.
Wherein, the calculation formula of the trimethylamine removal rate is as follows: [ (content of trimethylamine before treatment-content of trimethylamine after treatment)/content of trimethylamine before treatment ]. times.100%;
the formula for calculating the methyl mercaptan removal rate is as follows: [ (content of methyl mercaptan before treatment-content of methyl mercaptan after treatment)/content of methyl mercaptan before treatment ]. times.100%;
the calculation formula of the ammonia gas removal rate is as follows: [ (ammonia content before treatment-ammonia content after treatment)/ammonia content before treatment ]. times.100%;
the calculation formula of the formaldehyde removal rate is as follows: [ (content of formaldehyde before treatment-content of formaldehyde after treatment)/content of formaldehyde before treatment ]. times.100%.
TABLE 1
Figure BDA0003188666560000111
Figure BDA0003188666560000121
The results in table 1 show that when the catalyst provided by the invention is used for removing the indoor space odor, the catalyst can effectively catalyze and decompose odor gases such as trimethylamine, methyl mercaptan, ammonia gas and formaldehyde under the normal temperature condition, and the removal efficiency is high.
The present invention illustratively provides the odor removal catalyst prepared in example 1, as shown in fig. 1.
Fig. 1 is a physical diagram of the odor-removing catalyst prepared in example 1, and it can be seen from fig. 1 that the catalyst prepared by the present invention is white and has uniform pore channels.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims (16)

1. An odor-reducing catalyst comprising a carrier and an active component supported on the carrier, wherein the carrier is at least one selected from the group consisting of a honeycomb ceramic and a honeycomb metal plate, and the weight ratio of the carrier to the active component in the catalyst is 1: 0.05-0.35; the active ingredients comprise the following components in percentage by weight: 0.1-0.5: 0.005-0.02 of a first active component, a second active component and a third active component, wherein the first active component is a molecular sieve and/or modified alumina, the second active component is a transition metal oxide, and the third active component is nano-scale platinum and/or nano-scale palladium.
2. The catalyst according to claim 1, wherein the content weight ratio of the first active ingredient, the second active ingredient and the third active ingredient is 1: 0.1-0.3: 0.01-0.015.
3. The catalyst according to claim 1 or 2, wherein the content weight ratio of the carrier to the active ingredient in the catalyst is 1: 0.1-0.2.
4. The catalyst according to any one of claims 1 to 3, wherein the number of pores per unit cross-section in the support is 50 to 400 mesh, preferably 100 to 400 mesh.
5. The catalyst according to any one of claims 1 to 4, wherein the molecular sieve is at least one selected from the group consisting of ZSM-5 molecular sieve, BETA molecular sieve, and Y-type molecular sieve.
6. The catalyst according to any one of claims 1 to 5, wherein the transition metal oxide is at least one selected from the group consisting of cerium oxide, titanium dioxide, manganese oxide, copper oxide, cobalt oxide, chromium oxide, and iron oxide.
7. A method for preparing an odor-reducing catalyst, the method comprising:
(1) contacting a carrier, a first active ingredient and a salt solution of a transition metal to carry out a first impregnation to obtain a first solid impregnation; the first active ingredient is a molecular sieve and/or modified alumina;
(2) sequentially carrying out first drying and first roasting on the first solid impregnation to obtain a catalyst intermediate;
(3) carrying out second impregnation on the catalyst intermediate and a salt solution containing a third active ingredient to obtain a second solid impregnation; the third active component is nano platinum and/or nano palladium;
(4) carrying out second drying and second roasting on the second solid impregnation in sequence;
wherein the carrier is selected from at least one of honeycomb ceramics and honeycomb metal plates;
controlling the dosage of the carrier so that the weight ratio of the carrier to the sum of the total amount of the first active ingredient, the transition metal oxide and the third active ingredient in the obtained odor-removing catalyst is 1: 0.05-0.35;
controlling the dosage of the salt solution of the transition metal and/or the salt solution containing the third active component, so that the weight ratio of the first active component, the transition metal oxide and the third active component in the obtained deodorization catalyst is 1: 0.1-0.5: 0.005-0.02.
8. The method according to claim 7, wherein, in step (1), the conditions of the first impregnation comprise at least: the temperature is 50-90 ℃ and the time is 2-10 hours.
9. The method according to claim 7 or 8, wherein in step (1), the number of pores per unit cross-section in the carrier is 50-400 mesh, preferably 100-400 mesh;
preferably, in the step (1), the molecular sieve is at least one selected from ZSM-5 molecular sieve, BETA molecular sieve and Y type molecular sieve;
preferably, in step (1), the transition metal is selected from at least one of cerium, titanium, manganese, copper, cobalt, chromium, and iron.
10. The method according to any one of claims 7 to 9, wherein in step (1), the salt solution of the transition metal is at least one of an aqueous solution of a nitrate of the transition metal, an aqueous solution of an acetate of the transition metal, and a halide of the transition metal;
preferably, in the step (1), the salt solution of the transition metal is at least one selected from the group consisting of cerium nitrate, copper nitrate, manganese nitrate, copper nitrate, cobalt nitrate, chromium nitrate, iron nitrate, cerium chloride, titanium tetrachloride, manganese chloride, copper chloride, cobalt chloride, chromium chloride, iron chloride, cerium acetate, manganese acetate, copper acetate, cobalt acetate, and chromium acetate.
11. The method according to any one of claims 7 to 10, wherein in step (2), the conditions of the first drying comprise at least: the temperature is 100 ℃ and 130 ℃, and the time is 2-5 hours;
preferably, in the step (2), the conditions of the first firing at least include: the temperature is 350-650 ℃, and the time is 2-10 hours.
12. The method according to any one of claims 7-11, wherein in step (3), the conditions of the second impregnation comprise at least: the temperature is 50-90 ℃ and the time is 2-10 hours.
13. The method according to any one of claims 7 to 12, wherein, in the step (3), the salt solution containing the third active ingredient is at least one selected from chloroplatinic acid, platinum nitrate, palladium nitrate, and palladium chloride.
14. The method according to any one of claims 7 to 13, wherein in step (4), the conditions of the second drying comprise at least: the temperature is 100 ℃ and 130 ℃, and the time is 2-5 hours;
preferably, in the step (4), the conditions of the second firing at least include: the temperature is 350-650 ℃, and the time is 2-10 hours.
15. An odour-reducing catalyst when produced by a process as claimed in any one of claims 7 to 14.
16. Use of an odour-reducing catalyst as claimed in any one of claims 1 to 6 and claim 15 in an air cleaning apparatus.
CN202110869820.4A 2021-07-30 2021-07-30 Peculiar smell removing catalyst and preparation method and application thereof Pending CN113578374A (en)

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