CN110358565B - Emulsified asphalt for degrading waste gas - Google Patents
Emulsified asphalt for degrading waste gas Download PDFInfo
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- CN110358565B CN110358565B CN201910708440.5A CN201910708440A CN110358565B CN 110358565 B CN110358565 B CN 110358565B CN 201910708440 A CN201910708440 A CN 201910708440A CN 110358565 B CN110358565 B CN 110358565B
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- emulsified asphalt
- asphalt
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- waste gas
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- 239000010426 asphalt Substances 0.000 title claims abstract description 69
- 239000002912 waste gas Substances 0.000 title claims abstract description 33
- 230000000593 degrading effect Effects 0.000 title claims abstract description 18
- 239000003054 catalyst Substances 0.000 claims abstract description 77
- 239000002775 capsule Substances 0.000 claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 29
- 239000011259 mixed solution Substances 0.000 claims abstract description 24
- 239000007800 oxidant agent Substances 0.000 claims abstract description 21
- 230000001590 oxidative effect Effects 0.000 claims abstract description 15
- 239000000654 additive Substances 0.000 claims abstract description 14
- 230000000996 additive effect Effects 0.000 claims abstract description 14
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 58
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 34
- 239000004408 titanium dioxide Substances 0.000 claims description 29
- 238000013268 sustained release Methods 0.000 claims description 16
- 239000012730 sustained-release form Substances 0.000 claims description 16
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 13
- 239000006185 dispersion Substances 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 13
- 230000003197 catalytic effect Effects 0.000 claims description 12
- 239000002243 precursor Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 9
- 239000003607 modifier Substances 0.000 claims description 9
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 7
- 239000002808 molecular sieve Substances 0.000 claims description 6
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 6
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical group CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 5
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 5
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 5
- 239000012752 auxiliary agent Substances 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical group Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 5
- 229940071125 manganese acetate Drugs 0.000 claims description 5
- UOGMEBQRZBEZQT-UHFFFAOYSA-L manganese(2+);diacetate Chemical compound [Mn+2].CC([O-])=O.CC([O-])=O UOGMEBQRZBEZQT-UHFFFAOYSA-L 0.000 claims description 5
- 235000010413 sodium alginate Nutrition 0.000 claims description 5
- 239000000661 sodium alginate Substances 0.000 claims description 5
- 229940005550 sodium alginate Drugs 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical group Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 claims description 2
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims description 2
- 229940099596 manganese sulfate Drugs 0.000 claims description 2
- 239000011702 manganese sulphate Substances 0.000 claims description 2
- 235000007079 manganese sulphate Nutrition 0.000 claims description 2
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical group [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 2
- 238000013032 photocatalytic reaction Methods 0.000 claims description 2
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims 2
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 claims 1
- 238000005470 impregnation Methods 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 15
- 230000003647 oxidation Effects 0.000 abstract description 9
- 239000011941 photocatalyst Substances 0.000 abstract description 8
- 230000000052 comparative effect Effects 0.000 description 10
- 239000007788 liquid Substances 0.000 description 10
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000011521 glass Substances 0.000 description 9
- 230000001699 photocatalysis Effects 0.000 description 9
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 238000006555 catalytic reaction Methods 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000007146 photocatalysis Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000001110 calcium chloride Substances 0.000 description 3
- 229910001628 calcium chloride Inorganic materials 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/007—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 by irradiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Toxicology (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The application discloses emulsified asphalt capable of degrading waste gas, wherein a modified catalyst and a slow-release capsule are dispersed in water to obtain an additive mixed solution; adding the additive mixed solution into the basic emulsified asphalt, and uniformly mixing to obtain the emulsified asphalt for degrading the waste gas; the catalyst is added with the catalyst with specific components and the slow release capsule capable of slowly releasing the oxidant, so that the effect that one catalyst can purify two waste gases, namely automobile exhaust and asphalt volatile gas, is realized. The catalyst can be used as a photocatalyst on the surface of asphalt and also can be used as an oxidation catalyst on an asphalt phase, so that the cost of the catalyst is reduced, and the effect of synergistically removing the waste gas is realized.
Description
Technical Field
The application relates to emulsified asphalt for degrading waste gas, in particular to emulsified asphalt capable of reducing automobile exhaust and volatile gas of asphalt.
Background
With the rapid development of national economy, the holding quantity of automobiles in China is continuously increased, and the automobile exhaust emitted from the automobiles is more and more serious, so that the air pollution becomes a social problem focused by the public. For this reason, a variety of technologies for purifying automobile exhaust gases have been developed. Among them, the addition of a photocatalyst to a road surface material to remove automobile exhaust has attracted much attention, and numerous studies such as chinese patents CN1482178A, CN1970639A, CN103252225A, and CN103102700A disclose that titanium dioxide is added to an asphalt material to contact with automobile exhaust to purify the harmful gas. However, the above prior arts all have the following technical problems: (1) titanium dioxide is a photocatalyst, most of the titanium dioxide is in the bulk phase of asphalt after being mixed with the asphalt, and only part of the titanium dioxide is exposed on the surface, so that the utilization of the titanium dioxide is insufficient; (2) although titanium dioxide is a photocatalytic material, common titanium dioxide usually needs ultraviolet light to excite the titanium dioxide to perform photocatalytic action, so that the catalytic efficiency of the titanium dioxide under visible light is low; (3) most of research focuses on the removal of automobile exhaust, however, asphalt pavements can generate volatile gas in special conditions such as summer, and exhaust gas generated by pavement materials is ignored while automobile exhaust purification is focused, so that synergistic treatment cannot be achieved.
In view of the above technical problems, although the utilization rate of the photocatalyst can be improved by spraying a liquid containing titanium dioxide on the road surface to act on the surface of the asphalt, and the titanium dioxide is modified to be photocatalytic under visible light, none of the above methods can better cope with the gas volatilized from the asphalt. Therefore, how to purify automobile exhaust and asphalt volatile gas more effectively at the same time needs to be studied more deeply.
Disclosure of Invention
The application provides an emulsified asphalt of degradation waste gas, it can utilize the catalyst on pitch surface to carry out the photocatalysis and degrade automobile exhaust, and the catalyst in the body phase carries out the normal position degradation to the waste gas that produces in the asphalt material simultaneously, when having realized the make full use of catalyst, has purified automobile exhaust and pitch waste gas, and reduce cost has realized the effect of degradation waste gas. The specific technical scheme is as follows:
an emulsified asphalt for degrading exhaust gas, which is prepared by the following steps:
dispersing the modified catalyst and the sustained-release capsule in water to obtain an additive mixed solution;
adding the additive mixed solution into the basic emulsified asphalt, and uniformly mixing to obtain the emulsified asphalt for degrading the waste gas;
the modified catalyst takes a porous material as a carrier, takes titanium dioxide doped with a modifier as an active component, and takes manganese dioxide as an auxiliary agent; the modified catalyst can perform a photocatalytic reaction under visible light and can perform a catalytic oxidation reaction; the slow release capsule contains an oxidizing agent.
Preferably, in the emulsified asphalt for degrading waste gas, the mass content of the modified catalyst is 0.1-10%, the mass content of the slow-release capsule is 1-10%, and the mass ratio of the additive mixed solution to the basic emulsified asphalt is 15-35: 85-65.
Preferably, the carrier is immersed in a dispersion containing a titanium dioxide precursor and a modifier precursor, stirred, added with an alkaline substance, stirred continuously, filtered, dried and calcined to obtain a first catalyst, the first catalyst is immersed in a dispersion containing a manganese dioxide precursor, and the first catalyst is filtered, dried and calcined to obtain the modified catalyst.
Preferably, in the modified catalyst, the carrier is selected from activated carbon or molecular sieves, preferably molecular sieves; the titanium dioxide precursor is selected from titanium tetrachloride or tetrabutyl titanate; the precursor for modifying titanium dioxide is selected from ferric chloride or stannic chloride, and the precursor for manganese dioxide is selected from manganese sulfate or manganese acetate.
Preferably, in the modified catalyst, the mass content of the carrier is 70-95%, the content of the modified titanium dioxide is 5-25%, and the content of the manganese dioxide is 3-10%.
Preferably, in the modified titanium dioxide, the mass ratio of the modifying agent to the titanium dioxide is 5-20: 100.
Preferably, the wall material of the sustained-release capsule is dissolved in a solution of an oxidizing agent to obtain a mixed solution, and the mixed solution is dropped into the gel bath through a needle to obtain a solution sustained-release capsule containing an oxidizing agent.
Preferably, the wall material of the sustained-release capsule is sodium alginate, the oxidant solution is aqueous hydrogen peroxide solution, and the gel bath is calcium chloride solution.
Preferably, the concentration of the aqueous hydrogen oxide solution is 5 to 20% by mass.
Preferably, the mass solid content of the basic emulsified asphalt is 60-70%.
Has the advantages that:
(1) the modified catalyst takes modified titanium dioxide as an active component, and can generate photocatalysis under the condition of visible light, so that the modified catalyst on the surface of asphalt can remove automobile exhaust. Meanwhile, the modified titanium dioxide can also be used as an active component of a common oxidation catalyst, so that the modified catalyst in the asphalt bulk phase can play an oxidation role when the slow-release capsule releases an oxidant, volatile gas generated in the asphalt is decomposed in the asphalt bulk phase, and the residual volatile gas is degraded by the photocatalyst once again when being diffused to the surface of the asphalt. Therefore, this application can carry out make full use of with modified catalyst, no matter it distributes at the bulk phase or the surface, can both exert its catalytic action to get rid of automobile exhaust and pitch volatile gas simultaneously, not only saved the catalyst cost, utilized two kinds of waste gas of same kind of catalyst coprocessing moreover, reached the effect of more abundant purification waste gas.
(2) This application adopts the slow-release capsule technique with the oxidant after add the emulsified asphalt, pitch volatile gas is slower when the temperature is lower, the speed of oxidant from the slow-release capsule is lower, and pitch volatile gas is faster when the temperature is higher, the speed of oxidant from the slow-release capsule is higher, consequently, the speed that the slow-release capsule released the oxidant is positive correlation with pitch volatile speed basically, can more efficient decomposition volatile gas. Further, the modifying catalyst and the oxidizing agent may decompose organic substances that potentially become volatile gases before they become gases. The slow release capsule enables the release of the oxidant to be lasting for a long time, the waste gas degradation effect can be realized during the solidification of the emulsified asphalt and a period of time after the solidification, and the long-acting in-situ degradation effect on the volatile waste gas of the asphalt is realized.
(3) Manganese dioxide is used as a catalyst auxiliary agent, and when the modified catalyst is a photocatalyst, the manganese dioxide can possibly influence the energy level of titanium dioxide, so that the photocatalysis is assisted; when the modified catalyst is a catalytic oxidation catalyst, manganese dioxide has a decomposition effect on hydrogen peroxide, and can quickly decompose the hydrogen peroxide into substances such as oxygen, hydroxyl radicals and the like, so that an oxidant can be quickly and sufficiently oxidized under the titanium dioxide catalyst, and the decomposition of volatile gas is realized. Therefore, the manganese dioxide can complete different catalysis promoting effects under two different catalysis modes, and better realizes the synergistic catalysis effect.
(4) This application adopts porous material to be the carrier, and it can realize the absorption to waste gas, and the waste gas after the absorption is concentrated on and is decomposed under the effect of catalyst active component and cocatalyst, has realized higher catalytic efficiency, adopts the carrier can improve catalyst active component's specific surface area moreover, can realize catalytic efficiency's promotion when reducing catalyst cost.
Detailed Description
The technical solutions and advantages of the present invention are explained and illustrated in more detail below. It should be understood that the contents presented in the description and the detailed description are only for more clearly illustrating the technical solution and the advantages thereof, and do not limit the protection scope of the present invention. On the basis of the disclosure of the specification, a person skilled in the art can modify the technical solution according to various reasonable changes, and the modified technical solution is included in the protection scope of the invention as long as the person does not depart from the spirit of the invention.
Example 1
Dispersing 5g of modified catalyst and 5g of sustained-release capsule in 10g of water to obtain an additive mixed solution;
adding the additive mixed solution into 80g of basic emulsified asphalt (with the solid content of 60 percent), and uniformly mixing to obtain the emulsified asphalt for degrading waste gas;
wherein, 85g of molecular sieve (MCM-41) is dipped in dispersion liquid containing 10g (calculated by titanium dioxide) of titanium tetrachloride and 1g (calculated by ferric oxide) of ferric chloride and stirred for 30min, sodium hydroxide is added to ensure that the pH value of the dispersion liquid reaches 12, the mixture is continuously stirred for 1h, filtered, dried at 100 ℃ for 3h and air calcined at 550 ℃ for 3h to obtain a first catalyst, the first catalyst is dipped in dispersion liquid containing 4g (calculated by manganese dioxide) of manganese acetate, and the first catalyst is filtered, dried at 100 ℃ for 3h and air calcined at 550 ℃ for 3h to obtain the modified catalyst.
Wherein 10g of sodium alginate is dissolved in 1L of 15% hydrogen peroxide solution to obtain a mixed solution, and the mixed solution is dropped into 2% calcium chloride gel bath through a 0.2mm needle to obtain a sustained-release capsule containing hydrogen peroxide solution.
Example 2
Dispersing 10g of modified catalyst and 1g of sustained-release capsule in 15g of water to obtain an additive mixed solution;
adding the additive mixed solution into 74g of basic emulsified asphalt (with the solid content of 60 percent), and uniformly mixing to obtain the emulsified asphalt for degrading waste gas;
wherein 73g of molecular sieve (MCM-41) is dipped in a dispersion liquid containing 20g (calculated by titanium dioxide) of titanium tetrachloride and 4g (calculated by ferric oxide) of ferric chloride and stirred for 30min, sodium hydroxide is added to ensure that the pH value of the dispersion liquid reaches 12, the stirring is continued for 1h, the first catalyst is obtained by filtering, drying at 100 ℃ for 3h and calcining in air at 550 ℃ for 3h, the first catalyst is dipped in a dispersion liquid containing 3g (calculated by manganese dioxide) of manganese acetate, and the modified catalyst is obtained by filtering, drying at 100 ℃ for 3h and calcining in air at 550 ℃ for 3h after dipping.
Wherein 5g of sodium alginate is dissolved in 1L of 20% hydrogen peroxide solution to obtain a mixed solution, and the mixed solution is dropped into 2% calcium chloride gel bath through a 0.2mm needle to obtain a sustained-release capsule containing hydrogen peroxide solution.
Example 3
Dispersing 1g of modified catalyst and 10g of sustained-release capsule in 20g of water to obtain an additive mixed solution;
adding the additive mixed solution into 69g of basic emulsified asphalt (solid content is 70%), and uniformly mixing to obtain the emulsified asphalt for degrading waste gas;
wherein, 84.5g of molecular sieve (MCM-41) is dipped in a dispersion liquid containing 5g (calculated by titanium dioxide) of titanium tetrachloride and 0.5g (calculated by ferric oxide) of ferric chloride and stirred for 30min, sodium hydroxide is added to ensure that the pH value of the dispersion liquid reaches 12, the stirring is continued for 1h, the first catalyst is obtained by filtering, drying at 100 ℃ for 3h and air calcining at 550 ℃ for 3h, the first catalyst is dipped in a dispersion liquid containing 10g (calculated by manganese dioxide) of manganese acetate, and the modified catalyst is obtained by filtering, drying at 100 ℃ for 3h and air calcining at 550 ℃ for 3 h.
Wherein 15g of sodium alginate is dissolved in 1L of 10% hydrogen peroxide solution to obtain a mixed solution, and the mixed solution is dropped into 2% calcium chloride gel bath through a 0.2mm needle to obtain a sustained-release capsule containing hydrogen peroxide solution.
Comparative example 1
Same as example 1, but without addition of modified catalyst and slow release capsules.
Comparative example 2
Same as example 1, but without addition of a modifying catalyst.
Comparative example 3
Same as example 1, but without the addition of a sustained release capsule.
Comparative example 4
Same as example 1, but no modifier was included in the modified catalyst.
Comparative example 5
The same as example 1, but no promoter was included in the modified catalyst.
For the automotive exhaust gas simulation experiment: 5g of prepared emulsified asphalt is evenly coated on one surface of a glass sheet with the thickness of 5cm multiplied by 5cm, and the coating is carried out in a drying oven with the temperature of 30 ℃ for 16h, so as to obtain the solidified asphalt glass sheet. Putting the cured asphalt glass sheet into a glass tube reactor, introducing nitrogen containing 300ppm of formaldehyde into one end of the glass tube reactor to ensure that gas passes through the cured asphalt glass sheet and reaches the other end of the reactor, and detecting the formaldehyde content at the other end of the reactor, wherein the gas flow rate is 100mL/min, and the reactor is in visible light.
Simulation experiment for asphalt volatilization waste gas: 5g of prepared emulsified asphalt is evenly coated on one surface of a glass sheet with the thickness of 5cm multiplied by 5cm, and the coating is carried out for 5 hours in a drying oven with the temperature of 30 ℃ to obtain the initial curing asphalt glass sheet. And (3) putting the initially-cured asphalt glass sheet into a 60 ℃ open reactor, and detecting the concentration of VOCs in the reactor through a VOCs detector after a certain time interval.
TABLE 1 results of the experiment
By comparing examples 1-3 with comparative example 1, it can be found that the waste gas degraded emulsified asphalt of the present invention can purify harmful gases emitted from automobiles well by photocatalysis, and can purify harmful gases emitted from asphalt volatilization by catalytic oxidation. This application can realize that same catalyst plays different catalytic action in different positions, purifies the waste gas of different sources, has saved the catalyst cost, has improved the effect of purifying waste gas. It can be found by comparing example 1 and comparative example 2 that the automobile exhaust on the asphalt surface can hardly be purified without adding the modified catalyst, the oxidizing agent released in the slow-release capsule can purify the asphalt volatile gas, but the purification efficiency is reduced due to the absence of the oxidation catalyst. It can be found by comparing example 1 and comparative example 3 that the absence of the slow-release capsules has little effect on the photocatalytic performance of the modified catalyst, but the modified catalyst hardly achieves catalytic oxidation due to the absence of the oxidizing agent, and thus hardly purifies harmful gases volatilized from asphalt. It can be seen from comparing example 1 with comparative example 4 that the modifier functions to dope the titanium dioxide to an energy level such that it can react under visible light, and if the modifier is not used, the catalytic effect of the titanium dioxide under visible light is greatly impaired, and the reason why it can still partially decompose formaldehyde may be due to a small amount of ultraviolet rays in the light source, or the catalyst promoter performs a partial modification. The lack of the modifier has little influence on purifying the volatile waste gas of the asphalt. By comparing the example 1 with the comparative example 5, it can be found that the auxiliary manganese dioxide has a small energy level reduction effect on titanium dioxide when the modified catalyst is used as a photocatalyst, so that the photocatalytic effect is improved to a small extent; when the auxiliary agent manganese dioxide is used as an oxidation catalyst, the function of promoting the decomposition of the oxidant is very critical, and the effect of purifying the volatile waste gas of the asphalt can be greatly improved. The same auxiliary agent has different functions in different catalytic reactions, so that the catalyst cost is saved and the catalytic effect can be better realized.
The application discloses emulsified asphalt capable of degrading waste gas, which realizes the effect that one catalyst can purify two kinds of waste gas by adding the catalyst with specific components and the slow release capsule capable of slowly releasing the oxidant. The catalyst can be used as a photocatalyst on the surface of asphalt and also can be used as an oxidation catalyst on an asphalt phase, so that the cost of the catalyst is reduced, and the effect of synergistically removing the waste gas is realized.
While the present disclosure includes specific embodiments, it will be apparent to those skilled in the art that various substitutions or alterations in form and detail may be made to these embodiments without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. The embodiments described herein are to be considered in all respects only as illustrative and not restrictive. The description of features and aspects in each embodiment is believed to apply to similar features and aspects in other embodiments. Therefore, the scope of the invention should be defined not by the detailed description but by the claims, and all changes within the scope of the claims and equivalents thereof should be construed as being included in the technical solution of the present invention.
Claims (7)
1. An emulsified asphalt for degrading exhaust gas, which is prepared by the following steps:
dispersing the modified catalyst and the sustained-release capsule in water to obtain an additive mixed solution;
adding the additive mixed solution into the basic emulsified asphalt, and uniformly mixing to obtain the emulsified asphalt for degrading the waste gas;
the modified catalyst takes a porous material as a carrier, takes titanium dioxide doped with a modifier as an active component, and takes manganese dioxide as an auxiliary agent; the modified catalyst can perform a photocatalytic reaction under visible light and can perform a catalytic oxidation reaction; the sustained-release capsule contains an oxidant;
the preparation method of the sustained-release capsule comprises the following steps: dissolving the wall material of the sustained-release capsule in a solution of an oxidant to obtain a mixed solution, and dripping the mixed solution into a gel bath through a needle to obtain the sustained-release capsule containing the oxidant;
the wall material of the slow-release capsule is sodium alginate, the oxidant solution is hydrogen peroxide water solution, and the gel bath is calcium chloride solution; the mass concentration of the aqueous hydrogen oxide solution is 5-20%.
2. The waste gas degrading emulsified asphalt of claim 1, wherein the mass content of the modified catalyst is 0.1-10%, the mass content of the slow release capsule is 1-10%, and the mass ratio of the additive mixed solution to the basic emulsified asphalt is 15-35: 85-65.
3. The emulsified asphalt for degrading exhaust gas according to claim 1, wherein the carrier is immersed in the dispersion containing the titanium dioxide precursor and the modifier precursor, the mixture is stirred after the alkaline substance is added, the mixture is filtered, dried and calcined to obtain the first catalyst, the first catalyst is immersed in the dispersion containing the manganese dioxide precursor, and the modified catalyst is obtained after the impregnation, the filtration, the drying and the calcination.
4. The emulsified asphalt for degrading exhaust gas according to claim 3, wherein the modified catalyst comprises a carrier selected from the group consisting of activated carbon and molecular sieves; the titanium dioxide precursor is selected from titanium tetrachloride or tetrabutyl titanate; the precursor for modifying titanium dioxide is selected from ferric chloride or stannic chloride, and the precursor for manganese dioxide is selected from manganese sulfate or manganese acetate.
5. The emulsified asphalt for degrading exhaust gas of claim 4, wherein the modified catalyst comprises 70-95% by mass of the carrier, 5-25% by mass of the modified titanium dioxide, and 3-10% by mass of the manganese dioxide.
6. The waste gas-degrading emulsified asphalt of claim 5, wherein the modified titanium dioxide has a mass ratio of the modifier to the titanium dioxide of 5-20: 100.
7. The waste gas-degrading emulsified asphalt according to claim 1, wherein the base emulsified asphalt has a solid content of 60-70% by mass.
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