CN107008377A - The preparation method of ozone Heterogeneous oxidation solid catalyst - Google Patents

The preparation method of ozone Heterogeneous oxidation solid catalyst Download PDF

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CN107008377A
CN107008377A CN201710275252.9A CN201710275252A CN107008377A CN 107008377 A CN107008377 A CN 107008377A CN 201710275252 A CN201710275252 A CN 201710275252A CN 107008377 A CN107008377 A CN 107008377A
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dolomite
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solid catalyst
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朱明�
吴雨婕
王麒麟
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Sichuan Normal University
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Abstract

The present invention relates to a kind of preparation method of ozone Heterogeneous oxidation solid catalyst, category environmental protection and technical field of chemical engineering catalysts.With activated carbon, carnallite, dolomite, calcite, cubric niter and dolomite make carrier after lithium hypochlorite and double (acetylacetone,2,4-pentanedione) beryllium reamings, add surfactant β hydroxyethyl dimethyls ammonium lauryl sulfate and activation process is carried out under ul-trasonic irradiation, then carrier in hydrothermal reaction kettle with composite mineralizer borax and potassium sulfate, the cyclopentadiene promethium of catalytic activity auxiliary agent predecessor three, three (2, 2, 6, 6 tetramethyls 3, 5 heptadione acid) gadolinium, three (6, 6, 7, 7, 8, 8, 8 seven fluorine 2, 2 dimethyl 3, 5 octene diketone) dysprosium (III), trifluoromethayl sulfonic acid thulium (III), catalytic active center predecessor cobalt edetate, zinc lactate, L lucid asparagus amino acid molybdenums and Tris(2,2'- bipyridyl) ruthenium (II) chloride hexahydrate, hydro-thermal reaction is carried out under the effect of emulsifying agent octadecyldimethyl hydroxypropyl ammonium chloride, drying is removed after moisture, calcination obtains ozone Heterogeneous oxidation solid catalyst in Muffle furnace.

Description

The preparation method of ozone Heterogeneous oxidation solid catalyst
Technical field
The present invention relates to a kind of preparation method of ozone Heterogeneous oxidation solid catalyst, category environmental protection and chemical catalyst skill Art field.
Background technology
Ozonation technology using ozone oxidation ability it is strong the characteristics of, can be by many organic pollution oxidation Decompositions, extensively For wastewater treatment.Catalytic ozonation technology is divided into ozone homogeneous catalytic oxidation and ozone heterogeneous catalytic oxidation, and ozone is equal Phase catalysis oxidation has that the more difficult separation and recovery of catalyst is reused, ozone utilization rate is low causes water process operating cost higher, Organic pollutant removal rate is relatively low simultaneously and easily causing secondary pollution of water is limited to its application;Ozone heterogeneous catalysis oxygen There is change technology catalyst to be easily isolated and recycled and reusable, ozone utilization rate is high, organic pollutant removal rate is higher, drop Low water process operating cost and receive significant attention its application the advantages of do not result in secondary pollution.Ozone heterogeneous catalysis It is to reach local organic matter enrichment by catalyst surface absorption organic matter that oxidation of organic compounds, which is decomposed, while ozone molecule absorption exists The hydroxyl radical free radical that catalyst surface produces high activity under catalyst action decomposes organic matter.Ozone heterogeneous catalytic oxidation Handle in waste water technology, core technology is the preparation of ozone Heterogeneous oxidation solid catalyst.
Ozone Heterogeneous oxidation solid catalyst is generally made up of carrier, activated centre and auxiliary agent.Due to being polluted in waste water Species are various, complex chemical composition feature, can produce harmful effect to performance such as absorption, the mithridatism of catalyst. Prepare that the carrier structure that ozone Heterogeneous oxidation solid catalyst uses is more single at present, adsorptivity is relatively low;Activated centre is universal Using normal transition metal salt, mithridatism is poor;Preparation method mainly has infusion process, the precipitation method, mixing method and collosol and gel etc. Method attachment activity center and adjuvant component are easily liquated out in carrier surface, activated centre and adjuvant component, cause catalyst Easily lose catalytic activity.For exist in current ozone Heterogeneous oxidation solid catalyst preparation method Catalyst Adsorption compared with Low, mithridatism is poor and easily loses catalytic activity problem, and exploitation is strengthened using multicomponent porous carrier through reaming, surface active The adsorptivity of catalyst, catalytic activity auxiliary agent predecessor, normal transition Organometallic are made using Rare-earth chemicals Compound and precious metal chemical complex are made catalytic active center predecessor and prepared with multicomponent porous carrier through hydro-thermal reaction, high temperature sintering Ozone Heterogeneous oxidation solid catalyst containing multi-element metal has to improve the preparation method of catalyst mithridatism and catalytic activity There are larger environmental benefit and higher practical value.
The content of the invention
For existing in current ozone Heterogeneous oxidation solid catalyst preparation method, Catalyst Adsorption is relatively low, mithridatism Poor to lose catalytic activity problem with easy, exploitation strengthens catalyst using multicomponent porous carrier through reaming, surface active Adsorptivity, catalytic activity auxiliary agent predecessor, normal transition metallo-organic compound and expensive are made using Rare-earth chemicals Metallic compound is made catalytic active center predecessor and prepared with multicomponent porous carrier through hydro-thermal reaction, high temperature sintering containing polynary gold The ozone Heterogeneous oxidation solid catalyst of category to improve the preparation method of catalyst mithridatism and catalytic activity, it is characterized in that Component A can be added in closed reactor and deionized water stirring prepares the aqueous solution, the weight concentration for control component A is 2%~6%, After the completion of prepared by solution, B component is added under agitation, 35 DEG C~50 DEG C are warming up to, continues stirring reaction 3h~6h, is filtered, instead Product is answered to obtain reaming modified support after 102 DEG C~106 DEG C dry constant weights;Reaming modified support puts into ultrasound reactor, The aqueous solution prepared by component C and deionized water is added, the weight concentration of component C is 3%~8%, is uniformly mixed, and control is super Sound power density is 0.3~0.8W/m3, frequency 20kHz~30kHz, 40 DEG C~55 DEG C, sonic oscillation 2h~5h obtains ultrasound Surface active carrier mixed liquor;Ultrasonic surface activated carrier mixed liquor is transferred in hydrothermal reaction kettle, add D components and go from The aqueous solution that sub- water is prepared, the weight concentration of D components is 40%~55%, by weight, D component deionized water solutions:Ultrasonic table Weight ratio=1 of face activated carrier mixed liquor:(1.5~2), control 120 DEG C~180 DEG C of temperature, the hydro-thermal reaction time be 8h~ 16h, then dries to obtain fine particle;Fine particle is in Muffle furnace, 600 DEG C~950 DEG C, and calcination 3h~8h obtains ozone non- Homogeneous oxidizing solid catalyst.The component A is made up of lithium hypochlorite, double (acetylacetone,2,4-pentanedione) berylliums, by weight, lithium hypochlorite: Weight ratio=1 of double (acetylacetone,2,4-pentanedione) berylliums:(1~1.6), B component is by activated carbon, carnallite, dolomite, calcite, cubric niter , dolomite composition, by weight, activated carbon:Carnallite:Dolomite:Calcite:Cubric niter:Dolomitic weight ratio=(5 ~15):(7~17):(9~19):(11~21):(13~23):(15~25), by weight, component A:The weight of B component it Than=1:(10~20), component C is beta-hydroxyethyl dimethyl dodecyl base ammonium sulfate, by weight, component C:Reaming modified support Weight ratio=1:(5~10), D components are by composite mineralizer borax, potassium sulfate, the ring penta 2 of catalytic activity auxiliary agent predecessor three Alkene promethium, three (DPM dpm,dipivalomethane acid) gadoliniums, three (the fluoro- 2,2- dimethyl -3,5- of 6,6,7,7,8,8,8- seven Octene diketone) dysprosium (III), trifluoromethayl sulfonic acid thulium (III) Rare-earth chemicals, catalytic active center predecessor is common Transition metal organometallic compound cobalt edetate, zinc lactate, L- lucid asparagus amino acid molybdenums and precious metal chemical complex terpyridyl chlorine Change ruthenium hexahydrate, emulsifying agent octadecyldimethyl hydroxypropyl ammonium chloride is constituted, by weight, borax:Potassium sulfate:Three rings Pentadiene promethium:Three (DPM dpm,dipivalomethane acid) gadoliniums:Three (the fluoro- 2,2- dimethyl of 6,6,7,7,8,8,8- seven- 3,5- octenes diketone) dysprosium (III):Trifluoromethayl sulfonic acid thulium (III):Cobalt edetate:Zinc lactate:L- lucid asparagus amino acid molybdenums: Tris(2,2'- bipyridyl) ruthenium (II) chloride hexahydrate:The weight ratio of octadecyldimethyl hydroxypropyl ammonium chloride=(4~8):(6~10): (3~6):(4~7):(5~8):(6~9):(10~15):(12~18):(4~7):(6~9):(6~20).The B component Activated carbon, carnallite, dolomite, calcite, cubric niter, dolomite crushed respectively, deionized water washing, which is dried, to be removed After moisture, -200 mesh ,+400 mesh sieves point are carried out through standard screen, it is the mm of 0.0370mm~0.0750 control particle diameter.
What the technical method of the present invention was realized in:Lithium hypochlorite LiClO, double (second can be being added in closed reactor Acyl acetone) beryllium C10H14BeO4The aqueous solution is prepared with deionized water stirring, it is 0.0370mm~0.0750mm to add particle diameter after screening Activated carbon, carnallite, dolomite, calcite, cubric niter and dolomite porous material carrier, in certain temperature and stirring bar Under part, the small Be of aqueous solution Ionic Radius2+(0.31Å)、Li+(0.60Å)Displace part ion radius in porous material big Ca2+(0.99Å)、K+(1.33Å)、Ba2+(1.35Å)Plasma, the aperture of porous material carrier becomes big, surface roughness increasing Plus, filtering dries the reaming modified support input ultrasound reactor after constant weight, adds beta-hydroxyethyl dimethyl dodecyl base Ammonium sulfate [C12H25N(CH3)2CH2CH2OH]+CH3SO4 -The aqueous solution, controls ultrasonic power density, ultrasonic frequency, temperature and surpasses The sound oscillation time, under ultrasonic cavitation effect, beta-hydroxyethyl dimethyl dodecyl base ammonium sulfate [C12H25N(CH3)2CH2CH2OH]+CH3SO4 -It is easy to escape into reaming modified support duct from the aqueous solution or is attached to reaming modified support surface, It is beneficial to being interconnected and carrier surface activation for carrier duct, enhances adsorptivity;After the completion of ultrasonic activation, ultrasonic surface is lived Change carrier mixed liquor to be transferred in hydrothermal reaction kettle, with borax Na2B4O7·10H2O, potassium sulfate K2SO4Composite mineralizer, catalysis The cyclopentadiene promethium Pm (C of coagent predecessor three5H5)3, three (DPM dpm,dipivalomethane acid) gadolinium C33H57GdO6、 Three (the fluoro- 2,2- dimethyl -3,5- octenes diketone of 6,6,7,7,8,8,8- seven) dysprosium (III) C30H30DyF21O6, fluoroform sulphur Sour thulium (III) C3F9O9S3Tm Rare-earth chemicals, catalytic active center component predecessor normal transition Organometallic Compound cobalt edetate C12H22O14Co, zinc lactate C6H10O6Zn, L- lucid asparagus amino acid molybdenum Mo [OOCCH2CH(NH2)COO]3 (H2O)3With Tris(2,2'- bipyridyl) ruthenium (II) chloride hexahydrate (C10H8N2)3Cl2Ru·(H2O)6Precious metal chemical complex, in emulsifying agent octadecane Base dimethyl hydroxypropyl ammonium chloride [C18H37N(CH3)2CH2CH(OH)CH2]+Cl-Hydro-thermal reaction is carried out under, mineralizer accelerates to expand Dissipate effect, activate reactant lattice, promote the progress of solid phase reaction, ultrasonic surface activated carrier organises with rare earth metal Compound, normal transition metallo-organic compound, precious metal chemical complex Uniform Doped, emulsifying agent octadecyldimethyl hydroxypropyl chlorine Change ammonium make reaction solution formed quasi-stationary emulsion prevent separation of solid and liquid, sedimentation, while to the further surface of porous carrier live Change, by the way that in certain temperature, the hydro-thermal reaction of time, drying obtains the fine silt thing of Uniform Doped;The fine silt of Uniform Doped Thing is in Muffle furnace, through high temperature sintering, and organic matter carbonization therein further enhances the microcellular structure of porous carrier, obtains Ozone to the catalytic active center of porous carrier supported rare earth metal oxide, transition metal oxide and noble metal formation is non- Homogeneous oxidizing solid catalyst, improves the mithridatism and catalytic activity of catalyst.
Relative to art methods, outstanding feature of the present invention is that activated carbon, carnallite, white clouds are used in technology of preparing Stone, calcite, cubric niter, dolomite porous material make carrier, due to lithium hypochlorite LiClO and double (acetylacetone,2,4-pentanedione) berylliums C10H14BeO4Reaming effect, beta-hydroxyethyl dimethyl dodecyl base ammonium sulfate [C12H25N(CH3)2CH2CH2OH]+CH3SO4 -, ten Eight alkyl dimethyl hydroxypropyl ammonium chloride [C18H37N(CH3)2CH2CH(OH)CH2]+Cl-To being interconnected and surface work for duct Change is acted on;Rare-earth chemicals, normal transition metallo-organic compound and precious metal chemical complex are made by hydro-thermal reaction Reach Uniform Doped and be attached in carrier surface and duct, high temperature sintering makes organic matter carbonization strengthen and form multilayer Secondary microcellular structure, the multi-element metal of porous carrier supported rare earth metal oxide, transition metal oxide and noble metal formation Catalytic active center is combined more firm with porous carrier, and the ozone Heterogeneous oxidation solid catalyst of preparation has stronger suction Attached property, the cooperative effect of multi-element metal, the noble metal of particularly doping have stability and high activity, can suppress metal catalytic Liquating out for active component, improves the mithridatism and catalytic activity of catalyst, with good environmental benefit and economic benefit.
Embodiment
Embodiment 1:1.35g lithium hypochlorites, double (acetylacetone,2,4-pentanedione) berylliums of 1.65g, 140ml deionized waters are added to volume for 500ml Can be uniformly mixed in closed reactor, the weight concentration of the aqueous solution is 2.1%, lithium hypochlorite:Double (acetylacetone,2,4-pentanedione) berylliums Weight ratio=1:1.2;Add deionized water wash to it is neutral, 103 DEG C dry and remove the mesh of -200 mesh of sieving after moisture~+400 2.75g activated carbons, 3.75g carnallites, 4.75g dolomites, 5.75g calcites, 6.75g cubric niters, the 7.75g of standard screen are white The weight of Yun Yan, lithium hypochlorite and double (acetylacetone,2,4-pentanedione) berylliums(3g):The weight of porous material(31.5g)=1:10.5, it is warming up to 36 DEG C, obtain reaming modified support 31g after continuing stirring reaction 3.2h, filtering, 103 DEG C of dry constant weights;In 500ml ultrasonic responses In device, put into reaming modified support 31g, add 3.25g beta-hydroxyethyl dimethyl dodecyl base ammonium sulfate be dissolved in 100ml go from The aqueous solution of sub- water, the weight concentration of the aqueous solution is 3.1%, is uniformly mixed, beta-hydroxyethyl dimethyl dodecyl base sulfuric acid Ammonium(3.25g):Reaming modified support(31g )=1:9.5;It is 0.4 W/m to control ultrasonic power density3, ultrasonic frequency 41 DEG C of 21kHz, temperature, sonic oscillation 2.2h;After the completion of ultrasonic activation, the ultrasonic surface activated carrier in ultrasound reactor Mixed liquor is transferred in 500ml hydrothermal reaction kettles, add by 2.1g boraxs, 3.05g potassium sulfates, the cyclopentadiene promethiums of 1.6g tri-, 2.05g tri- (DPM dpm,dipivalomethane acid) gadolinium, 2.6g tri- (the fluoro- 2,2- dimethyl of 6,6,7,7,8,8,8- seven- 3,5- octenes diketone) dysprosium (III), 3.05g trifluoromethayl sulfonic acids thulium (III), 5.05g cobalt edetates, 6.1g zinc lactates, 2.05g L- lucid asparagus amino acid molybdenum, 3.1g Tris(2,2'- bipyridyl) ruthenium (II) chlorides hexahydrate, 3.05g octadecyldimethyl hydroxypropyl chlorine Change the aqueous solution that ammonium and 50ml deionized waters are prepared, the weight concentration of the aqueous solution is 40.3%, the weight of the aqueous solution:Ultrasound Weight=83.8g of surface active carrier mixed liquor:134.25g =1:1.6,125 DEG C of temperature is controlled, the hydro-thermal reaction time is 8.3h, then dries to obtain fine silt thing for 105 DEG C;Fine silt thing is in Muffle furnace, 620 DEG C, calcination 3.2h, can after cooling down Obtain the ozone Heterogeneous oxidation solid catalyst of fine particle shape.
Embodiment 2:0.24g lithium hypochlorites, double (acetylacetone,2,4-pentanedione) berylliums of 0.36g, 10ml deionized waters, being added to volume is 100ml's can be uniformly mixed in closed reactor, and the weight concentration of the aqueous solution is 5.7%, lithium hypochlorite:Double (levulinics Ketone) beryllium weight ratio=1:1.5;Add deionized water wash to it is neutral, 103 DEG C dry remove -200 mesh of sieving after moisture~+ The 1.45g activated carbons of 400 mesh standard sieves, 1.65g carnallites, 1.85g dolomites, 2.05g calcites, 2.25g cubric niters, The weight of 2.45g dolomites, lithium hypochlorite and double (acetylacetone,2,4-pentanedione) berylliums(0.6g):The weight of porous material(11.7g)=1: 19.5,48 DEG C are warming up to, reaming modified support 11.5g is obtained after continuing stirring reaction 5.8h, filtering, 105 DEG C of dry constant weights; In 100ml ultrasound reactors, reaming modified support 11.5g is put into, 2.2g beta-hydroxyethyl dimethyl dodecyl base sulphur is added Sour ammonium is dissolved in the aqueous solution of 26ml deionized waters, and the weight concentration of the aqueous solution is 7.8%, is uniformly mixed, beta-hydroxyethyl two Methyl ammonium lauryl sulfate(2.2g):Reaming modified support(11.5g )=1:5.2;It is 0.7 W/ to control ultrasonic power density m3, ultrasonic frequency 29kHz, 54 DEG C of temperature, sonic oscillation 4.7h;After the completion of ultrasonic activation, super in ultrasound reactor Sound surface active carrier mixed liquor is transferred in 100ml hydrothermal reaction kettles, add by 0.78g boraxs, 0.97g potassium sulfates, The cyclopentadiene promethiums of 0.58g tri-, 0.67g tri- (DPM dpm,dipivalomethane acid) gadolinium, 0.78g tri- (6,6,7,7,8,8, The fluoro- 2,2- dimethyl -3,5- octenes diketone of 8- seven) dysprosium (III), 0.87g trifluoromethayl sulfonic acids thulium (III), 1.48g glucose Sour cobalt, 1.77g zinc lactates, 0.68g L- lucid asparagus amino acid molybdenum, 0.87g Tris(2,2'- bipyridyl) ruthenium (II) chlorides hexahydrate, 1.98g 18 The aqueous solution that alkyl dimethyl hydroxypropyl ammonium chloride and 10ml deionized waters are prepared, the weight concentration of the aqueous solution is 53.3%, The weight of the aqueous solution:Weight=21.43g of ultrasonic surface activated carrier mixed liquor:39.7g =1:1.9, control temperature 175 DEG C, the hydro-thermal reaction time is 15.5h, then dries to obtain fine silt thing for 105 DEG C;Fine silt thing is in Muffle furnace, 930 DEG C, calcination After 7.5h, cooling down, the ozone Heterogeneous oxidation solid catalyst of fine particle shape can obtain.
Comparative example 1:Preparation process is not added with lithium hypochlorite, double (acetylacetone,2,4-pentanedione) berylliums, Β-hydroxyethyl dimethyl dodecyl Outside ammonium sulfate, octadecyldimethyl hydroxypropyl ammonium chloride, borax and potassium sulfate, whole preparation process, preparation condition and implementation Example 1 is identical.
The parameter of ozone Heterogeneous oxidation solid catalyst prepared by embodiment 1, embodiment 2 and comparative example 1 is included in table 1.
The embodiment of table 1 and comparative example prepare ozone Heterogeneous oxidation solid catalysis agent parameter
Project Average pore size (nm) Pore volume (cm3/g) BET is than surface (m2/g)
Embodiment 1 4.856 0.6330 732.41
Embodiment 2 4.403 0.5914 604.25
Comparative example 1 2.809 0.3855 421.89

Claims (2)

1. a kind of preparation method of ozone Heterogeneous oxidation solid catalyst, it is characterized in that A groups can added in closed reactor Divide and deionized water stirring prepares the aqueous solution, the weight concentration for controlling component A is 2%~6%, after the completion of prepared by solution, in stirring Lower addition B component, is warming up to 35 DEG C~50 DEG C, continues stirring reaction 3h~6h, and filtering, reaction product is dry at 102 DEG C~106 DEG C Reaming modified support is obtained after dry constant weight, reaming modified support input ultrasound reactor, addition is matched somebody with somebody by component C and deionized water The aqueous solution of system, the weight concentration of component C is 3%~8%, is uniformly mixed, and it is 0.3~0.8W/ to control ultrasonic power density m3, frequency 20kHz~30kHz, 40 DEG C~55 DEG C, sonic oscillation 2h~5h obtains ultrasonic surface activated carrier mixed liquor, transfer Into hydrothermal reaction kettle, the aqueous solution that D components and deionized water are prepared is added, the weight concentration of D components is 40%~55%, is pressed Weight meter, D component deionized water solutions:Weight ratio=1 of ultrasonic surface activated carrier mixed liquor:(1.5~2), control temperature 120 DEG C~180 DEG C, the hydro-thermal reaction time is 8h~16h, then dries to obtain fine silt thing, fine silt thing is in Muffle furnace, 600 DEG C~950 DEG C, calcination 3h~8h obtains ozone Heterogeneous oxidation solid catalyst;The component A by expanding agent lithium hypochlorite, Double (acetylacetone,2,4-pentanedione) beryllium compositions, by weight, lithium hypochlorite:Weight ratio=1 of double (acetylacetone,2,4-pentanedione) berylliums:(1~1.6), B groups Divide and be made up of activated carbon, carnallite, dolomite, calcite, cubric niter, dolomite, by weight, activated carbon:Carnallite:In vain Marble:Calcite:Cubric niter:Dolomitic weight ratio=(5~15):(7~17):(9~19):(11~21):(13~ 23):(15~25), by weight, component A:Weight ratio=1 of B component:(10~20), component C is beta-hydroxyethyl dimethyl Ammonium lauryl sulfate, by weight, component C:Weight ratio=1 of reaming modified support:(5~10), D components are by grandidierite Agent borax, potassium sulfate, the cyclopentadiene promethium of catalytic activity auxiliary agent predecessor three, three (2,2,6,6- tetramethyl -3,5- heptadione Acid) gadolinium, three (the fluoro- 2,2- dimethyl -3,5- octenes diketone of 6,6,7,7,8,8,8- seven) dysprosiums (III), trifluoromethayl sulfonic acid thulium (III) Rare-earth chemicals, catalytic active center predecessor normal transition metallo-organic compound cobalt edetate, breast Sour zinc, L- lucid asparagus amino acid molybdenums and precious metal chemical complex Tris(2,2'- bipyridyl) ruthenium (II) chloride hexahydrate, emulsifying agent hexadecyldimethylamine Base hydroxypropyl ammonium chloride is constituted, by weight, borax:Potassium sulfate:Three cyclopentadiene promethiums:Three (2,2,6,6- tetramethyls -3,5- Heptadione acid) gadolinium:Three (the fluoro- 2,2- dimethyl -3,5- octenes diketone of 6,6,7,7,8,8,8- seven) dysprosiums (III):Fluoroform sulphur Sour thulium (III):Cobalt edetate:Zinc lactate:L- lucid asparagus amino acid molybdenums:Tris(2,2'- bipyridyl) ruthenium (II) chloride hexahydrate:Octadecyl The weight ratio of dimethyl hydroxypropyl ammonium chloride=(4~8):(6~10):(3~6):(4~7):(5~8):(6~9):(10 ~15):(12~18):(4~7):(6~9):(6~20).
2. B component is made up of activated carbon, carnallite, dolomite, calcite, cubric niter, dolomite according to claim 1, Activated carbon, carnallite, dolomite, calcite, cubric niter, dolomite are crushed respectively, and deionized water washing, which is dried, removes water After point, sieved through standard screen, it is 0.0370mm~0.0750mm to control particle diameter.
CN201710275252.9A 2017-04-25 2017-04-25 The preparation method of ozone Heterogeneous oxidation solid catalyst Withdrawn CN107008377A (en)

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