CN109794160A - A kind of catalyst and preparation method thereof for decomposing formaldehyde - Google Patents
A kind of catalyst and preparation method thereof for decomposing formaldehyde Download PDFInfo
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- CN109794160A CN109794160A CN201711134835.6A CN201711134835A CN109794160A CN 109794160 A CN109794160 A CN 109794160A CN 201711134835 A CN201711134835 A CN 201711134835A CN 109794160 A CN109794160 A CN 109794160A
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Abstract
The catalyst and preparation method thereof that the present invention provides a kind of for decomposing formaldehyde.Catalyst according to the present invention for decomposing formaldehyde, the catalyst have the noble metal and storage oxygen metal oxide of Subnano-class using cordierite honeycomb ceramic as carrier, in supported on carriers.The preparation method of catalyst according to the present invention for decomposing formaldehyde, comprising: the cleaning step of cordierite honeycomb ceramic carrier, the preparation step of Subnano-class noble metal, the preparation step of composite mortar, adsorption step and drying and calcining step.Load has the noble metal of Subnano-class in catalyst carrier of the invention, and partial size is small, large specific surface area, and catalytic site is more, and catalytic activity is high；It has been also loaded storage oxygen metal oxide on carrier, the oxygen in air can be captured, oxidation of formaldehyde is promoted to decompose；And carrier is done using cordierite honeycomb ceramic, there is certain mechanical strength and fabulous cellular structure.Preparation method according to the present invention can obtain catalyst of the invention.
Description
Technical field
The present invention relates to chemical field more particularly to a kind of catalyst and preparation method thereof for decomposing formaldehyde.
Background technique
With the improvement of living standards, requirement of the people to living environment is also continuously improved, especially air quality is mentioned
Higher requirement is gone out.According to the study found that modern is up to 80% the activity time indoors.Therefore, how to guarantee interior
Air quality becomes the emphasis of researcher and R&D personnel's concern.
In numerous air pollutants, formaldehyde has greatly danger as health of the major pollutants to people
Evil, therefore how formaldehyde is catalytically decomposed in efficient green circulation, it has also become researcher and R&D personnel's focus of attention.
Currently, the method for processing formaldehyde includes absorption method, photocatalytic method and catalytic oxidation.Wherein, absorption method is the most
A kind of common method using active carbon etc. there is the material of strong adsorption capacity to make adsorption module, to having in room air
Evil gas carries out physical absorption, achievees the purpose that purify air, but because of the limited sorption capacity of material, it is full to there is absorption
The limitation of sum also will cause secondary pollution if the material after adsorption saturation is mishandling, not be able to satisfy wanting for green circulatory
It asks.
Photocatalytic method can make formaldehyde be completely decomposed into water and carbon dioxide, achieve the effect that green catalysis, in ultraviolet light
Or under the illumination of visible light, the redox ability PARA FORMALDEHYDE PRILLS(91,95) having using catalyst is catalytically decomposed, but photocatalysis
Method is more demanding to catalytic condition, does not have universality.
And catalytic oxidation, it can be directly carbon dioxide and water by Formaldehyde decomposition, secondary pollution, green ring will not be generated
It protects, but the catalyst more in the prior art for catalysis oxidation there are catalytic efficiencies not high, catalyst carrier mechanical property
Can be bad the problems such as.
Accordingly, it is desirable to provide a kind of high catalytic efficiency, the good catalyst of catalyst carrier mechanical property.
Summary of the invention
The object of the present invention is to provide a kind of catalyst, and the catalytic efficiency to solve catalyst in the prior art is not high and urges
The bad technical problem of agent carrier mechanical property.
In order to solve the above-mentioned technical problem, as one aspect of the present invention, a kind of urging for decomposing formaldehyde is provided
Agent, the catalyst using cordierite honeycomb ceramic as carrier, on the carrier load have Subnano-class noble metal and
Store up oxygen metal oxide.
In a specific embodiment, the load capacity of the catalyst are as follows: it is carrier loaded described in every 100g have 0.5~
The noble metal of 1.5g.
In a specific embodiment, the noble metal is platinum particles.
As further preferably, the partial size of the platinum particles is 2~4nm.
In a specific embodiment, the storage oxygen metal oxide is titanium dioxide.
As another aspect of the present invention, a kind of preparation method of catalyst for decomposing formaldehyde is provided, comprising:
The cleaning step of cordierite honeycomb ceramic carrier: the cordierite honeycomb ceramic carrier is impregnated in acid solution,
It is dry after being cleaned by ultrasonic in deionized water；
The preparation step of Subnano-class noble metal: under protectant protection, use alcohol as reducing agent by noble metal
Compound is reduced to the noble metal of Subnano-class, obtains colloidal solution；
The preparation step of composite mortar: being added storage oxygen metal oxide in the colloidal solution and polyethylene glycol mixing is equal
Composite mortar is obtained after even；
Adsorption step: the cordierite honeycomb ceramic carrier after cleaning is impregnated in the composite mortar, makes sub-nanometer
The noble metal and storage oxygen metal oxide of grade are adsorbed in the surface of the cordierite honeycomb ceramic carrier；
Drying and calcining step: it will be calcined after the cordierite honeycomb ceramic carrier drying after dipping.
In a specific embodiment, in the cleaning step of the cordierite honeycomb ceramic carrier, the acid solution
For 10~20% nitric acid solution by percentage to the quality；Soaking time is 15~30min, is cleaned by ultrasonic in deionized water
Time is 30~60min, and drying temperature is 50~70 DEG C, and drying time is 8~14h.
In a specific embodiment, in the preparation step of the Subnano-class noble metal, the protective agent
For polyvinylpyrrolidone, the alcohol is methanol, ethyl alcohol or isopropanol, and the precious metal chemical complex is chloroplatinic acid.
As further preferably, in the preparation step of the Subnano-class noble metal, by the polyvinyl pyrrole
Alkanone is dissolved in the water, and polyvinylpyrrolidone described in every 6~10mg is dissolved in every 5~10ml deionized water, with every 6~10mg
The polyvinylpyrrolidone is corresponding to be added the platinum acid chloride solution that every 1~5ml concentration is 6~12g/L, with 1: 1 in reaction solution
Alcohol is added in~9: 1 volume ratio of alcohol to water, in 50~80 DEG C of 1~4h of reflux.
In a specific embodiment, in the preparation step of the composite mortar, the storage oxygen metal oxide is two
Titanium oxide.
Load has the noble metal of Subnano-class in catalyst carrier of the invention, and the partial size of noble metal is small, compares
Surface area is big, therefore catalytic site is more, and catalytic activity is high；There is storage oxygen metal oxidation in the supported on carriers of catalyst of the invention
Object can capture the oxygen in air, promote oxidation of formaldehyde to decompose, improve the purification efficiency of formaldehyde；Catalyst of the invention is adopted
Carrier is done with cordierite honeycomb ceramic, there is certain mechanical strength and fabulous cellular structure, can reduce windage.According to this
The preparation method of invention can obtain catalyst of the invention.
Detailed description of the invention
Fig. 1 shows the Subnano-class platinum particles transmission electron microscope photo that embodiment 4 is prepared；
Fig. 2 shows the catalyst that embodiment 4 is prepared.
Specific embodiment
The embodiment of the present invention is described in detail below, but what the present invention can be defined by the claims and cover
Multitude of different ways is implemented.
According to an aspect of the present invention, a kind of catalyst for decomposing formaldehyde is provided, the catalyst is with cordierite bee
Nest ceramics are carrier, have the noble metal and storage oxygen metal oxide of Subnano-class in supported on carriers.
Load has the noble metal of Subnano-class in catalyst carrier of the invention, and the partial size of noble metal is small, compares
Surface area is big, therefore catalytic site is more, and catalytic activity is high；There is storage oxygen metal oxidation in the supported on carriers of catalyst of the invention
Object can capture the oxygen in air, promote oxidation of formaldehyde to decompose, improve the purifying rate of formaldehyde；Catalyst of the invention uses
Cordierite honeycomb ceramic does carrier, has certain mechanical strength and fabulous cellular structure, can reduce windage.
A kind of embodiment of catalyst according to the present invention, the load capacity of catalyst are as follows: every 100g is carrier loaded 0.5~
The noble metal of 1.5g.
The noble metal of enough Subnano-class has been loaded in catalyst of the invention, and there is sufficiently high catalysis
Activity can make the formaldehyde in air be compared complete catalytic decomposition.
In a specific embodiment, noble metal is platinum particles.
The catalytic effect that platinum particles PARA FORMALDEHYDE PRILLS(91,95) decomposes is more preferable, naturally it is also possible to select the noble metal grain of other Subnano-class
Son, such as palladium particle.
As further preferably, the partial sizes of platinum particles is 2~4nm, and partial size is smaller, catalytic site is increased, is improved
Catalytic efficiency, further improves the purifying rate of PARA FORMALDEHYDE PRILLS(91,95).
In a specific embodiment, storage oxygen metal oxide is titanium dioxide, and titanium dioxide captures oxygen in air
Ability it is strong, the oxygen in air can be captured, for Formaldehyde decomposition use, promote the decomposition of formaldehyde.
As another aspect of the present invention, a kind of preparation method of catalyst for decomposing formaldehyde is provided, comprising: violet
The cleaning step of green stone honeycomb ceramic carrier: cordierite honeycomb ceramic carrier is impregnated in acid solution, is surpassed in deionized water
It is dry after sound cleaning；The preparation step of Subnano-class noble metal: under protectant protection, use alcohol will be expensive as reducing agent
Metallic compound is reduced to the noble metal of Subnano-class, obtains colloidal solution；The preparation step of composite mortar: molten in colloid
Storage oxygen metal oxide powder is added in liquid and polyethylene glycol obtains composite mortar after mixing；Adsorption step: after cleaning
Cordierite honeycomb ceramic carrier be impregnated in composite mortar, make Subnano-class noble metal and storage oxygen metal oxide inhale
Invest the surface of cordierite honeycomb ceramic carrier；Drying and calcining step: after the cordierite honeycomb ceramic carrier drying after dipping
It is calcined.
In the preparation process in accordance with the present invention, it is especially restored in the preparation step of Subnano-class noble metal using alcohol
Agent has been prepared the noble metal nano particles with Subnano-class, has been carried in carrier, since partial size is smaller, increases
Catalytic site, improves catalytic efficiency, improves the resolution ratio of formaldehyde；In the preparation step of composite mortar, it is added to storage
Oxygen metal oxide makes catalyst be provided with the ability of oxygen in capture air, promotes the decomposition of formaldehyde, improve formaldehyde
Purifying rate.Wherein in the preparation step of composite mortar, polyethylene glycol is added as thickener, wherein every 1~5ml concentration for 6~
The platinum acid chloride solution of 12g/L, corresponding 0.02~1g titanium dioxide and 2~10ml polyethylene glycol, stir 4~8h.In adsorption step,
On the one hand adsorption time can be such that titania powder is preferably fixed on carrier for 4~8h in drying and calcining step, also
Can be with activated catalyst, drying temperature is 50-70 DEG C, and drying time is 8~14h, in tube furnace 300~500 DEG C of calcinings 4~
8h。
In a specific embodiment, in the cleaning step of cordierite honeycomb ceramic carrier, acid solution is with quality
10~20% nitric acid solution of percentages, soaking time are 15~30min, and being cleaned by ultrasonic the time in deionized water is 30
~60min, drying temperature are 50~70 DEG C, and drying time is 8~14h.
Wherein, in the cleaning step of cordierite honeycomb ceramic carrier, the impurity on cordierite honeycomb ceramic surface can be washed off,
The metallic of Subnano-class can be made preferably to be carried on carrier surface.
In a specific embodiment, in the preparation step of Subnano-class noble metal, protective agent is polyethylene pyrrole
Pyrrolidone, alcohol are methanol, ethyl alcohol or isopropanol, and metallic compound is chloroplatinic acid.
Wherein, polyvinylpyrrolidone is added wherein and does for the molecular weight of polyvinylpyrrolidone preferably 400~10000
Colloidal solution polymerization can be effectively prevented in protective agent；Wherein alcohol selects methanol, ethyl alcohol or isopropanol that stable Ya Na can be generated
The noble metal of meter level.
As further preferably, in the preparation step of Subnano-class noble metal, polyvinylpyrrolidone is dissolved
Yu Shuizhong, every 6~10mg polyvinylpyrrolidone correspondence is dissolved in every 5~10ml deionized water, with every 6~10mg polyethylene
Pyrrolidones is corresponding to be added the platinum acid chloride solution that 1~5ml concentration is 6~12g/L, with 1: 1~9: 1 alcohol water body in reaction solution
Product is than being added alcohol, in 50~80 DEG C of 1~4h of reflux.
In the preparation step, under the above reaction condition, the platinum grain of the stable Subnano-class of partial size can be prepared
Son.
In a specific embodiment, in the preparation step of composite mortar, storage oxygen metal oxide is titanium dioxide.Storage
Oxygen metal oxide can preferably capture the oxygen in air using titanium dioxide, promote the decomposition of formaldehyde.
Preparation method according to the present invention has been loaded the catalyst of the noble metal of Subnano-class, and has been urged
Storage oxygen metal oxide is loaded in agent, PARA FORMALDEHYDE PRILLS(91,95) has good catalytic rate.
The present invention is described further below in conjunction with specific embodiments, it should be noted that of the invention
Embodiment be only used for that the present invention will be described, rather than the limitation to the claims in the present invention protection scope.
Embodiment 1
In the preparation method of the present embodiment, the cleaning step of cordierite honeycomb ceramic carrier is carried out first: by cordierite bee
Nest ceramic monolith impregnates in acid solution, dry after being cleaned by ultrasonic in deionized water, and acid solution is by percentage to the quality
10% nitric acid solution, soaking time 15min, being cleaned by ultrasonic the time in deionized water is 30min, drying temperature 50
DEG C, drying time 8h；Then it carries out the preparation step of Subnano-class noble metal: under protectant protection, being made with alcohol
Precious metal chemical complex is reduced to the noble metal of Subnano-class for reducing agent, obtains colloidal solution, protective agent is polyethylene
Pyrrolidones, alcohol are methanol, and precious metal chemical complex is chloroplatinic acid, and polyvinylpyrrolidone is dissolved in the water, 6mg polyethylene pyrrole
Pyrrolidone corresponds to 5ml deionized water, corresponding that the platinum acid chloride solution that 1ml concentration is 6g/L is added, with 1: 1 alcohol water in reaction solution
Alcohol is added in volume ratio, in 50 DEG C of reflux 1h；The preparation step of composite mortar is carried out later: storage oxygen metal being added in colloidal solution
Oxide powder and polyethylene glycol obtain composite mortar after mixing, and storage oxygen metal oxide is titanium dioxide, and dioxy is added
Change titanium 0.02g, polyethylene glycol 2ml, stirs 4h；Then it carries out adsorption step: the cordierite honeycomb ceramic carrier after cleaning is soaked
Stain makes the noble metal of Subnano-class and storage oxygen metal oxide be adsorbed in cordierite honeycomb ceramic carrier in composite mortar
Surface, adsorption time 4h；Calcining step is finally dried: will be carried out after the cordierite honeycomb ceramic carrier drying after dipping
Calcining, drying temperature are 50 DEG C, drying time 8h, 300 DEG C of calcining 4h in tube furnace；Drying and calcining step terminates, catalysis
The preparation of agent is completed.
Embodiment 2
In the preparation method of the present embodiment, the cleaning step of cordierite honeycomb ceramic carrier is carried out first: by cordierite bee
Nest ceramic monolith impregnates in acid solution, dry after being cleaned by ultrasonic in deionized water, and acid solution is by percentage to the quality
20% nitric acid solution；Soaking time is 30min；The ultrasonic cleaning time is 60min in deionized water；Drying temperature is 70
DEG C, drying time 14h；Then it carries out the preparation step of Subnano-class noble metal: under protectant protection, being made with alcohol
Precious metal chemical complex is reduced to the noble metal of Subnano-class by reducing agent, obtains colloidal solution, and protective agent is polyethylene pyrrole
Pyrrolidone, alcohol are ethyl alcohol alcohol, and precious metal chemical complex is chloroplatinic acid, and polyvinylpyrrolidone is dissolved in the water, 10mg polyethylene
Pyrrolidones corresponds to 10ml deionized water, corresponding that the platinum acid chloride solution that 5ml concentration is 12g/L is added, with 9: 1 in reaction solution
Alcohol is added in volume ratio of alcohol to water, in 80 DEG C of reflux 4h；The preparation step of composite mortar is carried out later: storage oxygen being added in colloidal solution
Metal oxide powder and polyethylene glycol obtain composite mortar after mixing, and storage oxygen metal oxide is titanium dioxide, wherein
Corresponding titanium dioxide 1g, polyethylene glycol 10ml, stir 8h；Then adsorption step is carried out: by the cordierite honeycomb ceramic after cleaning
Carrier impregnation makes the noble metal of Subnano-class and storage oxygen metal oxide be adsorbed in cordierite honeycomb ceramic in composite mortar
The surface of carrier, adsorption time 8h；Calcining step is finally dried: the cordierite honeycomb ceramic carrier after dipping is dry
After calcined, drying temperature be 50-70 DEG C, drying time be 8~14h, 300~500 DEG C of 4~8h of calcining in tube furnace；
Drying and calcining step terminates, and the preparation of catalyst is completed.
Embodiment 3
In the preparation method of the present embodiment, the cleaning step of cordierite honeycomb ceramic carrier is carried out first: by cordierite bee
Nest ceramic monolith impregnates in acid solution, dry after being cleaned by ultrasonic in deionized water, and acid solution is by percentage to the quality
15% nitric acid solution；Soaking time is 20min；The ultrasonic cleaning time is 40min in deionized water；Drying temperature is 60
DEG C, drying time 10h；Then it carries out the preparation step of Subnano-class noble metal: under protectant protection, being made with alcohol
Precious metal chemical complex is reduced to the noble metal of Subnano-class for reducing agent, obtains colloidal solution, protective agent is polyethylene
Pyrrolidones, alcohol are isopropanol, and precious metal chemical complex is chloroplatinic acid, and polyvinylpyrrolidone is dissolved in the water, every poly- second of 8mg
Alkene pyrrolidone corresponds to 8ml deionized water, corresponding that the platinum acid chloride solution that 4ml concentration is 10g/L is added, with 5: 1 in reaction solution
Volume ratio of alcohol to water be added alcohol, in 70 DEG C of reflux 3h；The preparation step of composite mortar is carried out later: storage being added in colloidal solution
Oxygen metal oxide powder and polyethylene glycol obtain composite mortar after mixing, and storage oxygen metal oxide is titanium dioxide,
Middle corresponding titanium dioxide 0.5g, corresponding polyethylene glycol 6ml, stirs 6h；Then adsorption step is carried out: by the cordierite bee after cleaning
Nest ceramic monolith is impregnated in composite mortar, and the noble metal of Subnano-class and storage oxygen metal oxide is made to be adsorbed in cordierite bee
The surface of nest ceramic monolith, adsorption time 6h；Calcining step is finally dried: the cordierite honeycomb ceramic after dipping is carried
It is calcined after soma is dry, drying temperature is 60 DEG C, drying time 12h, 400 DEG C of calcining 6h in tube furnace；Drying and calcining
Step terminates, and the preparation of catalyst is completed.
Embodiment 4
In the preparation method of the present embodiment, the cleaning step of cordierite honeycomb ceramic carrier is carried out first: by cordierite bee
Nest ceramic monolith impregnates in acid solution, dry after being cleaned by ultrasonic in deionized water, and acid solution is by percentage to the quality
15% nitric acid solution；Soaking time is 30min；The ultrasonic cleaning time is 40min in deionized water；Drying temperature is 60
DEG C, drying time 12h；Then carry out Subnano-class noble metal preparation step: under protectant protection, use alcohol as
Precious metal chemical complex is reduced to the noble metal of Subnano-class by reducing agent, obtains colloidal solution, and protective agent is polyethylene pyrrole
Pyrrolidone, alcohol are methanol, and precious metal chemical complex is chloroplatinic acid, and polyvinylpyrrolidone is dissolved in the water, 8mg polyvinyl pyrrole
Alkanone corresponds to 8ml deionized water, corresponding that the platinum acid chloride solution that 4ml concentration is 8g/L is added, with 9: 1 alcohol water body in reaction solution
Product is than being added alcohol, in 60 DEG C of reflux 2h；The preparation step of composite mortar is carried out later: storage oxygen metal oxygen being added in colloidal solution
Compound powder and polyethylene glycol obtain composite mortar after mixing, and storage oxygen metal oxide is titanium dioxide, wherein corresponding two
Titanium oxide 0.05g, corresponding polyethylene glycol 4ml, stirs 6h；Then adsorption step is carried out: by the cordierite honeycomb ceramic after cleaning
Carrier impregnation makes the noble metal of Subnano-class and storage oxygen metal oxide be adsorbed in cordierite honeycomb ceramic in composite mortar
The surface of carrier, adsorption time 5h；Calcining step is finally dried: the cordierite honeycomb ceramic carrier after dipping is dry
After calcined, drying temperature be 60 DEG C, drying time 8h, 400 DEG C of calcining 6h in tube furnace；Drying and calcining step knot
The preparation of beam, catalyst is completed.
Embodiment 5
In the preparation method of the present embodiment, the cleaning step of cordierite honeycomb ceramic carrier is carried out first: by cordierite bee
Nest ceramic monolith impregnates in acid solution, dry after being cleaned by ultrasonic in deionized water, and acid solution is by percentage to the quality
15% nitric acid solution；Soaking time is 30min；The ultrasonic cleaning time is 40min in deionized water；Drying temperature is 60
DEG C, drying time 12h；Then it carries out the preparation step of Subnano-class noble metal: under protectant protection, being made with alcohol
Precious metal chemical complex is reduced to the noble metal of Subnano-class for reducing agent, obtains colloidal solution, protective agent is polyethylene
Pyrrolidones, alcohol are ethyl alcohol, and precious metal chemical complex is chloroplatinic acid, and polyvinylpyrrolidone is dissolved in the water, 7mg polyethylene pyrrole
Pyrrolidone corresponds to 7ml deionized water, corresponding that the platinum acid chloride solution that 3ml concentration is 11g/L is added, with 9: 1 alcohol in reaction solution
Alcohol is added in water volume ratio, in 60 DEG C of reflux 2h；The preparation step of composite mortar is carried out later: storage oxygen gold being added in colloidal solution
Belong to oxide powder and polyethylene glycol obtains composite mortar after mixing, storage oxygen metal oxide is titanium dioxide, wherein right
Titanium dioxide 0.05g, corresponding polyethylene glycol 4ml is answered to stir 6h；Then adsorption step is carried out: by the cordierite honeycomb after cleaning
Ceramic monolith is impregnated in composite mortar, and the noble metal of Subnano-class and storage oxygen metal oxide is made to be adsorbed in cordierite honeycomb
The surface of ceramic monolith, adsorption time 6h；Calcining step is finally dried: by the cordierite honeycomb ceramic carrier after dipping
It is calcined after drying, drying temperature is 60 DEG C, drying time 8h, 400 DEG C of calcining 6h in tube furnace；Drying and calcining step
Terminate, the preparation of catalyst is completed.
Embodiment 6
In the preparation method of the present embodiment, the cleaning step of cordierite honeycomb ceramic carrier is carried out first: by cordierite bee
Nest ceramic monolith impregnates in acid solution, dry after being cleaned by ultrasonic in deionized water, and acid solution is by percentage to the quality
15% nitric acid solution；Soaking time is 30min；The ultrasonic cleaning time is 40min in deionized water；Drying temperature is 60
DEG C, drying time 12h；Then it carries out the preparation step of Subnano-class noble metal: under protectant protection, being made with alcohol
Precious metal chemical complex is reduced to the noble metal of Subnano-class for reducing agent, obtains colloidal solution, protective agent is polyethylene
Pyrrolidones, alcohol are methanol, and precious metal chemical complex is chloroplatinic acid, and polyvinylpyrrolidone is dissolved in the water, 6mg polyethylene pyrrole
Pyrrolidone corresponds to 7ml deionized water, corresponding that the platinum acid chloride solution that 4ml concentration is 7g/L is added, with 5: 1 alcohol water in reaction solution
Alcohol is added in volume ratio, in 60 DEG C of reflux 2h；The preparation step of composite mortar is carried out later: storage oxygen metal being added in colloidal solution
Oxide powder and polyethylene glycol obtain composite mortar after mixing, and storage oxygen metal oxide is titanium dioxide, wherein corresponding to
Titanium dioxide 0.05g, corresponding polyethylene glycol 4ml, stirs 7h；Then it carries out adsorption step: the cordierite honeycomb after cleaning is made pottery
Ceramic carrier is impregnated in composite mortar, and the noble metal of Subnano-class and storage oxygen metal oxide is made to be adsorbed in cordierite honeycomb pottery
The surface of ceramic carrier, adsorption time 4h；Calcining step is finally dried: the cordierite honeycomb ceramic carrier after dipping is done
It is calcined after dry, drying temperature is 60 DEG C, drying time 8h, 400 DEG C of calcining 6h in tube furnace；Drying and calcining step knot
The preparation of beam, catalyst is completed.
Applicant is in order to detect the purification efficiency of the catalyst PARA FORMALDEHYDE PRILLS(91,95) being prepared, and test is according to referring to JG/T294-
2010 " performance tests of air purifier pollutant purification ", catalyst thickness be 1.5cm, windward side having a size of 3cm*3cm, meet
Face wind speed is 1.58m/s, upstream concentration of formaldehyde is 0.5mg/m3, operating temperature be 25 DEG C under conditions of in embodiment 4,5 and 6
Catalyst carried out the detection that formaldehyde once passes through purification efficiency, respectively 10%, 8% and 7%, it can thus be seen that urging
Agent can reach ideal formaldehyde removal rate after the catalysis of multiple circulation absorption.
The platinum particles of Subnano-class obtained in the catalyst preparation process of embodiment 4 have also been carried out transmission electricity by applicant
Microscopy is surveyed, and transmission electron microscope photo is as shown in Figure 1, the particle size range for the nano platinum particle being prepared as seen from Figure 1 is 2-
4nm。
In addition, Fig. 2 shows the catalyst that the embodiment of the present invention 4 is prepared, using cordierite honeycomb ceramic as carrier,
The supported on carriers platinum particles and titanium dioxide of Subnano-class.
The above is only preferred embodiments of the invention, are not intended to restrict the invention, for those skilled in the art
For, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification, etc.
With replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of catalyst for decomposing formaldehyde, which is characterized in that the catalyst is using cordierite honeycomb ceramic as carrier, in institute
State noble metal and storage oxygen metal oxide that supported on carriers has Subnano-class.
2. catalyst according to claim 1, which is characterized in that the load capacity of the catalyst are as follows: carried described in every 100g
Body loads the noble metal for having 0.5~1.5g.
3. catalyst according to claim 1, which is characterized in that the noble metal is platinum particles.
4. catalyst according to claim 3, which is characterized in that the partial size of the platinum particles is 2~4nm.
5. catalyst according to claim 1, which is characterized in that the storage oxygen metal oxide is titanium dioxide.
6. a kind of preparation method of the catalyst for decomposing formaldehyde characterized by comprising
The cleaning step of cordierite honeycomb ceramic carrier: the cordierite honeycomb ceramic carrier is impregnated in acid solution, is being gone
It is dry after being cleaned by ultrasonic in ionized water；
The preparation step of Subnano-class noble metal: under protectant protection, make reducing agent for precious metal chemical complex with alcohol
It is reduced to the noble metal of Subnano-class, obtains colloidal solution；
The preparation step of composite mortar: being added storage oxygen metal oxide powder in the colloidal solution and polyethylene glycol mixing is equal
Composite mortar is obtained after even；
Adsorption step: the cordierite honeycomb ceramic carrier after cleaning is impregnated in the composite mortar, makes Subnano-class
Noble metal and storage oxygen metal oxide are adsorbed in the surface of the cordierite honeycomb ceramic carrier；
Drying and calcining step: it will be calcined after the cordierite honeycomb ceramic carrier drying after dipping.
7. preparation method according to claim 6, which is characterized in that walked in the cleaning of the cordierite honeycomb ceramic carrier
In rapid, the acid solution is 10~20% nitric acid solution by percentage to the quality, and the bubble time is 15~30min, go from
Being cleaned by ultrasonic the time in sub- water is 30~60min, and drying temperature is 50~70 DEG C, and drying time is 8~14h.
8. preparation method according to claim 6, which is characterized in that walked in the preparation of the Subnano-class noble metal
In rapid, the protective agent is polyvinylpyrrolidone, and the alcohol is methanol, ethyl alcohol or isopropanol, and the precious metal chemical complex is
Chloroplatinic acid.
9. preparation method according to claim 8, which is characterized in that walked in the preparation of the Subnano-class noble metal
Suddenly, the polyvinylpyrrolidone is dissolved in the water, polyvinylpyrrolidone described in every 6~10mg is dissolved in every 5~10ml
It is corresponding with polyvinylpyrrolidone described in every 6~10mg that the chloroplatinic acid that 1~5ml concentration is 6~12g/L is added in deionized water
Alcohol is added with 1: 1~9: 1 volume ratio of alcohol to water in reaction solution, in 50~80 DEG C of 1~4h of reflux in solution.
10. preparation method according to claim 6, which is characterized in that in the preparation step of the composite mortar, the storage
Oxygen metal oxide is titanium dioxide.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111495358B (en) * | 2020-04-23 | 2021-08-17 | 中国科学院地球环境研究所 | Formaldehyde remover with normal-temperature catalytic activity and preparation method thereof |
| CN114029056A (en) * | 2021-12-24 | 2022-02-11 | 安徽元琛环保科技股份有限公司 | Volatile organic compound treatment catalyst, preparation method and application thereof |
| CN114452975A (en) * | 2021-12-27 | 2022-05-10 | 西安近代化学研究所 | Honeycomb ceramic supported palladium-based catalyst and application thereof in HBIW hydrogenolysis debenzylation |
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| CN114029056A (en) * | 2021-12-24 | 2022-02-11 | 安徽元琛环保科技股份有限公司 | Volatile organic compound treatment catalyst, preparation method and application thereof |
| CN114452975A (en) * | 2021-12-27 | 2022-05-10 | 西安近代化学研究所 | Honeycomb ceramic supported palladium-based catalyst and application thereof in HBIW hydrogenolysis debenzylation |
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