CN104667991A - Method for preparing catalytic wet oxidation catalyst carrier - Google Patents
Method for preparing catalytic wet oxidation catalyst carrier Download PDFInfo
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- CN104667991A CN104667991A CN201310621017.4A CN201310621017A CN104667991A CN 104667991 A CN104667991 A CN 104667991A CN 201310621017 A CN201310621017 A CN 201310621017A CN 104667991 A CN104667991 A CN 104667991A
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Abstract
The invention discloses a method for preparing a catalytic wet oxidation catalyst. The carrier uses activated carbon with particle size of 150-300 meshes as a core and amorphous silica-alumina as a shell, wherein the activated carbon is 10-70 percent of the weight of the carrier material, and the amorphous silica-alumina is 30-90 percent of the weight of the carrier material. The method comprises the following steps: introducing amino acid treated activated carbon slurry into the process of gelling amorphous silica-alumina; molding or not molding to prepare the catalyst carrier by means of aging, drying and other steps. The carrier is especially suitable for a catalytic wet oxidation catalyst, so that the catalyst has relatively high reaction activity and using stability, and the service life of the catalyst can be prolonged.
Description
Technical field
The present invention relates to a kind of method for making of catalytic wet oxidation catalyst carrier.
Background technology
Along with the increasingly stringent of global environmental regulation, the Con trolling index of sewage qualified discharge requires more and more higher, under this form, waste water treatment by catalytic oxidation more and more obtains attention and the employing of people, as the CWO, catalytic and oxidative electrolysis technology, photochemical catalytic oxidation, advanced oxidation etc. of high-concentration sewage.In waste water catalytic oxidation process, for obtain desirable treatment effect and by reduce reaction temperature, reaction pressure to keep lower wastewater treatment expense, preparation have high-activity component, high strength, high stability cheap catalyst become undoubtedly waste water catalytic oxidation technologies apply key.
The catalyst of waste water catalytic oxidation is mainly divided into homogeneous catalyst and heterogeneous solid catalyst two class.
Homogeneous catalyst mainly comprises the Fenton reagent, the Fe that produce oxygen radical
3+, Cu
2+, the metal ion such as cobalt and manganese, by means of the effect of these homogeneous catalysts, organic component in waste water, sulfide, ammonia nitrogen etc. are oxidized into low molecular acid (low mass molecule alcohol or carbon dioxide), sulfate or thiosulfate, nitrogen etc. by oxide isolations such as air, oxygen, ozone, hydrogen peroxide, make waste water reach the processing intent of decarburization, desulfurization and denitrogenation.Homogeneous oxidation catalyst preparation and use procedure comparatively simple, the slaines such as iron, copper, cobalt, manganese generally directly can be selected to be made into the aqueous solution or directly to put in handled waste water, and discharge or the use of regeneration Posterior circle by the water outlet after processing.Adopt homogeneous catalytic oxidation, because metal active constituent can fully dissolve and disperse in waste water, generally can reach comparatively stable water treatment effect, but also exist that reagent consumption is large, operating cost is high, the serious problems such as metal loss and secondary pollution, cause its application to be subject to larger restriction.
Heterogeneous solid catalyst mainly with active carbon, molecular sieve, amorphous alumina, titanium dioxide etc. for carrier, make with one or more in alkali metal, alkaline-earth metal, transition metal or Pt, Pd noble metal the catalyst that active component formed.Active carbon be made up of carbonaceous material black, hole is flourishing, specific area large, a class microcrystalline carbon of high adsorption capacity.Activated carbon property is stablized, and acidproof, alkaline-resisting, heat-resisting, water insoluble or organic solvent, easily regenerates, and is a kind of environmentally friendly adsorbent, is widely used in the fields such as Industrial " three Waste " improvement, food, medicine, carrier, semiconductor, battery and power storage.Mostly select active carbon as carrier for the heterogeneous solid catalyst of wastewater treatment at present, but the catalyst anti-wear performance selecting merely activated carbon supported metal to prepare is poor, mechanical strength is not high, and the metal of load easily runs off, and the effect of activated-carbon catalyst is made a discount.Amorphous aluminum silicide is because having good chemical stability, pore volume is large, have compared with strong acidity, the advantage such as pore size distribution$ is concentrated, mechanical strength is large, corrosion-resistant, be widely used at catalytic field, but there is the little shortcoming of specific surface in amorphous aluminum silicide, to organic absorption and conversion capability relatively weak.
CN201110225789.7 discloses a kind of method utilizing discarded active amorphous alumina preparation benzene adsorption material, it be by useless active amorphous aluminium oxide through cleaning, filter, after drying, adopt cryogenic seal heat treatment mode to prepare a kind of active amorphous aluminium oxide/absorbent charcoal composite material, to benzene, there is good adsorption effect.The method is by the organic matter carbonizing of amorphous alumina inside, and active carbon is mainly distributed in the duct of amorphous alumina, so not only can block the duct of aluminium oxide, and such generated active carbon skewness in aluminium oxide.
CN201110255525.6 discloses the preparation method of a kind of active amorphous aluminium oxide/absorbent charcoal composite material, be by waste aluminum sludge, active carbon, binding agent through mixing, granulation, old, shaping, dry, sinter, rinsing, drying and other steps make active amorphous aluminium oxide/absorbent charcoal composite material.The method belongs to salic species and active carbon physical mixing processes, and aluminium oxide and active carbon disperse uneven; And the mud impurity content used is high, the amorphous alumina character of gained is unstable, cannot repeat, complex structure.
CN201010267074.3 discloses a kind of preparation method of activated alumina composite reactive Carbon Materials, with aluminium hydroxide, active carbon and binding agent for raw material, through mixing, granulation, old, shaping, dry, sinter, rinsing, drying and other steps, the composite obtained like this is still the physical mixture of aluminium oxide and active carbon, aluminium oxide and active carbon disperse uneven, and its combination property also needs further raising.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of preparation method of catalytic wet oxidation catalyst carrier.The catalytic wet oxidation catalyst adopting this catalyst carrier to make has good catalytic performance, and anti-wear performance is strong, and stability in use is good.
The preparation method of catalytic wet oxidation catalyst carrier of the present invention, comprising:
(1) 150 order ~ 300 order active carbons are adopted amino acid process, then pull an oar;
(2) in amorphous aluminum silicide plastic process, introduce the active carbon slurries that step (1) obtains;
(3) material after the plastic that obtains of step (2) carry out aging, filter, washing, dry, obtain catalyst carrier material;
(4) carrier material of step (3) gained is made catalyst carrier, preferably at least adopts one of following method:
A, by the carrier material of step (3) gained, roasting under inert gas shielding, obtains catalyst carrier;
B, by shaping for the carrier material of step (3) gained, after drying, roasting under inert gas shielding, obtains catalyst carrier;
C, by carrier material roasting under inert gas shielding of step (3) gained, and then through shaping, after drying, roasting under inert gas shielding, obtains catalyst carrier.
Catalyst carrier of the present invention, with 150 order ~ 300 object active carbons for core, take amorphous aluminum silicide as shell, wherein with catalyst carrier weight for benchmark, the content of active carbon is 10% ~ 70%, be preferably 30% ~ 70%, the content of amorphous aluminum silicide is 30% ~ 90%, is preferably 30% ~ 70%.
Catalyst carrier of the present invention can be do not need shaping powder carrier, also can be shaping carrier.The granularity of powder carrier is generally 0.05 ~ 0.2mm.Shaping carrier can determine the size of carrier fractions as required, is generally 0.5 ~ 8.0mm.
The character of shaping of catalyst carrier of the present invention is as follows: specific area is 200 ~ 1000m
2/ g, pore volume is 0.5 ~ 2.0cm
3/ g, rate of wear <3wt%, side pressure strength is 100 ~ 300N/cm.
Step of the present invention (1) described active carbon can select conventional Powdered Activated Carbon commodity, as all kinds of wood activated charcoal, active fruit shell carbon, active carbon from coal; Also can select with wooden material, mineral material, plastics and discarded object, as the various activated carbon products that timber, wood chip, charcoal, coconut husk, fruit stone, shell, coal, gangue, petroleum coke, asphalt, polyvinyl chloride, polypropylene, organic resin, damaged tire, excess sludge etc. obtain through traditional preparation methods.The active carbon used in the present invention is powdered active carbon, granularity 150 ~ 300 order, specific area 500 ~ 3000m
2/ g, pore volume 0.5 ~ 1.8cm
3/ g, average pore radius 1 ~ 10nm.
In the inventive method, the making beating of active carbon described in step (1) adopts conventional method to carry out, general adopt add water, one or more in low-carbon alcohols pull an oar, wherein low-carbon alcohols to be carbon number be in the monohydric alcohol of 1 ~ 5 one or more.
In the inventive method, step (1) active carbon first adopts amino acid process, then pulls an oar.Described amino acid is hydrophilic amino acid, such as, in glycine, serine, threonine, cysteine, tyrosine, asparagine, glutamine, lysine, arginine, histidine, aspartic acid, glutamic acid one or more, preferred carbon number is less than the hydrophilic amino acid of the long-chain of 20.Such as aspartic acid, glutamic acid, lysine etc.Described amino acid consumption accounts for 2% ~ 50% of activated carbon weight, is preferably 5% ~ 20%.Amino acid can directly mix with active carbon by amino acid process active carbon, also amino acid can be dissolved in solvent and add active carbon again, solvent is wherein water, one or more in low-carbon alcohols (namely carbon number is the monohydric alcohol of 1 ~ 5).During amino acid process active carbon, its liquid-solid volume ratio below 10, preferably 1 ~ 5.After amino acid process active carbon, excessive liquid phase is preferably crossed and is filtered, and then pulls an oar.Making beating can adopt conventional method to carry out, general adopt add water, one or more in low-carbon alcohols pull an oar, wherein low-carbon alcohols to be carbon number be in the monohydric alcohol of 1 ~ 5 one or more.
The plastic process of the amorphous aluminum silicide described in step of the present invention (2) can be undertaken by process well known to those skilled in the art.The plastic process of amorphous aluminum silicide is generally the neutralization reaction process of acid material and alkaline material.Plastic process can adopt the mode of the continuous acid-base titration of soda acid, also can adopt two kinds of materials and the mode of stream neutralization.
In step of the present invention (2), amorphous aluminum silicide plastic process can be undertaken by process well known to those skilled in the art.Amorphous aluminum silicide plastic process is generally the neutralization reaction process of acid material and alkaline material, and plastic process generally adopts two kinds of materials and flows plastic mode of operation, or a kind of material is placed on another kind of material in plastic cans and adds the mode of operation of plastic continuously.Plastic material generally comprises aluminium source (Al
2(SO
4)
3, AlCl
3, Al (NO
3)
3and NaAlO
2deng in one or more), silicon source (in waterglass, Ludox and organic silicon-containing compound etc. one or more), precipitating reagent (NaOH, NH
4oH or CO
2deng), the different choice according to plastic process uses, and conventional mode of operation mainly contains: (1) acid aluminium salt (Al
2(SO
4)
3, AlCl
3, Al (NO
3)
3) and basic aluminium salt (NaAlO
2) or alkaline precipitating agent (NaOH, NH
4oH) in and plastic, (2) basic aluminium salt (NaAlO
2) and acidic precipitation agent (CO
2) in and plastic.Plastic cans is generally introduced in silicon source in plastic process, also can with aluminium source or precipitant mix after again in and plastic, as waterglass add carry out in basic aluminium salt or alkaline precipitating agent in and plastic, Ludox add carry out in acid aluminium salt in and plastic etc.Silicon source also can add in the rear material of aluminium source precipitation.Also can two or more be combined by aforesaid way.Said method is all well-known to those skilled in the art.Described plastic process is generally carried out at room temperature ~ 85 DEG C, is comparatively suitably for 40 ~ 80 DEG C, is preferably 50 ~ 70 DEG C.Described plastic process is generally carried out under certain pH value condition, and typical pH is 6.0 ~ 10.0, is comparatively suitably for 7.0 ~ 9.5, is preferably 7.5 ~ 9.0.Aging described in step (4), condition is as follows: pH is 6.0 ~ 10.0, and be preferably 7.0 ~ 9.5, ageing time 0.25 ~ 8 hour, is comparatively adapted at 0.5 ~ 5 hour, and be preferably 1 ~ 3 hour, aging temperature is room temperature ~ 85 DEG C, is preferably 40 ~ 80 DEG C.Temperature time aging and pH with in time temperature preferably identical with pH.
In step of the present invention (2), the incorporation way of the mixture of step (1) gained adopts the one or more combination of following manner: this mixture, in plastic neutralization reaction process, adds in plastic cans by (1) continuously; (2) this mixture is first joined in plastic cans, then will prepare in the acid material of amorphous aluminum silicide and alkaline material and plastic; (3) one or more with plastic material of this mixture are mixed, then in plastic material and plastic.
In step of the present invention (3), the mode of washing of described material is known in those skilled in the art, can select making beating washing, add the mode such as water washing, lower alcohols washing when filtering, the temperature of washing should in the temperature range of room temperature ~ 90 DEG C, preferably 50 ~ 70 DEG C.The washing of described material is generally carried out in the scope that pH is 1.0 ~ 9.0, and preferred pH is 4.0 ~ 8.5.Material described in step of the present invention (3) should not contain or contain the heteroion of seldom amount after washing, filtration, and heteroion comprises Na
+, Cl
-, SO
4 2-, NO
3 -, K
+deng in one or more.
In step of the present invention (3), described material is after washing, filtering, filter cake carries out drying, and drying mode can adopt natural drying, oven drying, spraying dry, microwave drying or infra-red drying, and the general drying condition adopted is as follows: drying 1 ~ 15 hour at 50 ~ 150 DEG C.
In step of the present invention (4), method A obtains powdered catalytic agent carrier without shaping roasting direct.Roasting condition described in method A is as follows: sintering temperature is 450 ~ 700 DEG C, and roasting time is 1 ~ 10 hour.
In step of the present invention (4), shaping described in method B and method C can be carried out as required, and be generally strip, cylindric, spherical, irregular strip, special-shaped ball etc., granularity can be determined as required, is generally 0.5 ~ 8.0mm.In described forming process, shaping assistant can be added as required as one or more in adhesive, peptization acid, extrusion aid etc.
In step of the present invention (4), the drying condition described in method B is generally at 80 ~ 200 DEG C, and dry 1 ~ 15 hour, sintering temperature was generally 450 ~ 700 DEG C, and roasting time is generally 1 ~ 10 hour.
In step of the present invention (4), in method C, by carrier material roasting under inert gas shielding of step (3) gained, described roasting condition is as follows: sintering temperature is 450 ~ 700 DEG C, and roasting time is 1 ~ 10 hour.And then through shaping, after drying, roasting under inert gas shielding; obtain catalyst carrier, the drying condition after shaping is as follows: at 80 ~ 200 DEG C, dry 1 ~ 15 hour; roasting condition is as follows: sintering temperature is generally 450 ~ 700 DEG C, and roasting time is generally 1 ~ 10 hour.
In the present invention, under inert gas shielding, carry out roasting, selected inert gas is generally nitrogen or argon gas.
Catalyst carrier of the present invention is is core with active carbon, take amorphous aluminum silicide as shell, make like this reactant first with as after the amorphous aluminum silicide haptoreaction of shell, contact with the active carbon as stratum nucleare again and react, make full use of that amorphous aluminum silicide aperture is large, pore volume is high and active carbon specific area is large, the feature of high adsorption capacity, make catalyst have higher reactivity and stability in use, improve the service life of catalyst.This carrier is particularly useful as catalytic wet oxidation catalyst carrier, especially the catalytic wet oxidation catalyst carrier of Love psychology, with the stability of the activity and use that improve catalyst.
In the preparation process of catalyst carrier of the present invention, especially pull an oar again after adopting amino acid process active carbon, then introduce in the plastic process of amorphous aluminum silicide, such amino acid is adsorbed on the surfaces externally and internally of active carbon uniformly, the amino acid be mixed in the middle of amorphous aluminum silicide and active carbon is made to decompose charing by follow-up roasting process, the active carbon of new formation connects amorphous aluminum silicide and active carbon, make the combination of active carbon and amorphous aluminum silicide tightr, the inner surface of the new Activated Carbon Modification former active carbon of the amino acid on active carbon inner surface through being decomposed to form, add the adsorption activity position of active carbon inner surface.Therefore, amino acid process active carbon, can promote amorphous aluminum silicide closely coating active charcoal, is conducive to the mechanical strength and the abrasion resisting performance that improve catalyst, and improve the utilization rate of the inner surface of active carbon, be conducive to the activity and the stability that improve catalyst.
Catalyst support preparation process of the present invention is simple, convenient, is easy to operation, is applicable to industrial production.
Detailed description of the invention
The specific area of product of the present invention and pore volume adopt low temperature liquid nitrogen physisorphtion to measure.Rate of wear adopts drum-type abrasion instrument to measure (specifically to see " catalyst support preparation and application technology " (petroleum industry publishing house, in May, 2002, Zhu Hongfa writes, and 4.5.4 saves).Powder carrier granularity adopts laser particle size analyzer to measure; Shaping carrier and catalyst grain size adopt sieve method to record.In the present invention, wt% is mass fraction.
Further illustrate preparation method of the present invention below in conjunction with specific embodiment, but scope of the present invention is not only limited to the scope of these embodiments.
Commercially available powdery coconut husk charcoal specific area 928m used in the present invention
2/ g, pore volume 1.0cm
3/ g, average pore size 1.1nm, iodine sorption value 700mg/g, granularity 200 order.Waterglass raw material is technical grade, and modulus is 3.0.
embodiment 1
Solid aluminum chloride is joined in distilled water, heat and be stirred to dissolving, obtaining liquor alumini chloridi (a).Concentrated ammonia liquor is added appropriate distilled water diluting into about 10wt% weak aqua ammonia (b).Powdery coconut husk charcoal adds in glutamic acid aqueous solution and mixes, and liquid-solid volume ratio is 3:1, and then add water making beating, obtains slurries (c).Waterglass according to 1:2 dilution proportion in deionized water, be configured to solution (d).(a) is added and after being heated with stirring to 65 DEG C in plastic cans, open the valve of the container having (b), control, within 10 minutes, system in tank is added drop-wise to pH=4.5, continue to drip (b), open the valve of the container having (c), control, in 30 minutes, system in tank is added drop-wise to pH=8.0, control the valve of the container of (c), ensure now to be added dropwise to complete.Keep temperature to be 65 DEG C, pH=8.0, stops after 20 minutes, in system, adds solution (d), is that 45wt% calculating added in 10 minutes according to the content of silica in amorphous aluminum silicide.Aging 1 hour, filtered by material in tank, washing to without chlorion, is filtered, and by filter cake drying 10 hours at 110 DEG C, obtains carrier material A-1.Then roasting 5 hours under 550 DEG C of conditions under nitrogen protection, pulverizes and sieves and obtains powder carrier J-1.The amount of plastic agents useful for same lists in table 1.
Get powder carrier J-1 100 grams, form paste, extruded moulding with the peptization liquid comes into contact containing nitric acid, then at 110 DEG C dry 10 hours, under nitrogen protection, under 550 DEG C of conditions, roasting, after 5 hours, obtained shaping catalyst carrier Z-1, and its character is in table 2.
embodiment 2
Solid aluminum sulfate is joined in distilled water, heat and be stirred to dissolving, obtaining aluminum sulfate solution (a).Concentrated ammonia liquor is added appropriate distilled water diluting into about 10% weak aqua ammonia (b).Powdery coconut husk charcoal adds in glutamic acid aqueous solution and mixes, and liquid-solid volume ratio is 5:1, and then add water making beating, obtains active carbon slurries (c).Waterglass according to 1:2 dilution proportion in deionized water, be configured to solution (d).(a) is added and after being heated with stirring to 65 DEG C in plastic cans, open the valve of the container having (b), control, within 10 minutes, system in tank is added drop-wise to pH=4.5, continue to drip (b), open the valve of the container having (c), control, in 30 minutes, system in tank is added drop-wise to pH=8.0, control the valve of the container of (c), ensure now to be added dropwise to complete.Keep temperature to be 65 DEG C, pH=8.0, stops after 20 minutes, in system, adds solution (d), is that 50wt% calculating added in 10 minutes according to the content of silica in amorphous aluminum silicide.Aging 1 hour, material in tank is filtered, wash to sulfate radical-free ion, filter, by filter cake at 110 DEG C dry 10 hours, obtain carrier material A-2.Then roasting 5 hours under 550 DEG C of conditions under nitrogen protection, pulverizes and sieves and obtains powder carrier J-2.The amount of plastic agents useful for same lists in table 1.
Get carrier material A-2 100 grams, form paste, extruded moulding with the peptization liquid comes into contact containing nitric acid, then at 110 DEG C dry 10 hours, under nitrogen protection, under 550 DEG C of conditions, roasting, after 5 hours, obtained shaping catalyst carrier Z-2, and its character is in table 2.Then with containing the impregnation fluid of Ce-Cu, then at 110 DEG C dry 10 hours, roasting 5 hours under 550 DEG C of conditions under nitrogen protection, obtain catalyst B, its composition was in table 3.
embodiment 3
Solid aluminum sulfate is joined in distilled water, heat simultaneously and be stirred to dissolving, obtain aluminum sulfate solution (a).Solid sodium metaaluminate being mixed with concentration is 250g Al
2o
3/ l sodium aluminate solution (b).Added in glutamic acid aqueous solution by powdery coconut husk charcoal and mix, liquid-solid volume ratio is 3:1, and then add water making beating, obtains slurries (c).Get a plastic cans, insert after 2L deionized water and stirring is heated to 60 DEG C and add slurries (c).Waterglass according to 1:2 dilution proportion in deionized water, be configured to solution (d).Get a retort, insert after 2L deionized water and stirring is heated to 65 DEG C, open the valve of container having (a), (b), (c), the pH=8.0 of the hierarchy of control simultaneously, control in 45 minutes, (a) and (c) to be dripped off simultaneously.Keep temperature to be 65 DEG C, pH=8.0, stops after 20 minutes, in system, adds solution (d), calculates added in 10 minutes according to the content 55wt% of silica in amorphous aluminum silicide.Aging 1 hour, material in tank is filtered, wash to sulfate radical-free ion, filter, by filter cake at 110 DEG C dry 10 hours, obtain carrier material A-3.Then roasting 5 hours under 550 DEG C of conditions under nitrogen protection, pulverizes and sieves and obtains powder carrier J-3.The amount of plastic agents useful for same lists in table 1.
Get carrier material A-3 100 grams, form paste, extruded moulding with the peptization liquid comes into contact containing nitric acid, then at 110 DEG C dry 10 hours, under nitrogen protection, under 550 DEG C of conditions, roasting, after 5 hours, obtained shaping catalyst carrier Z-3, and its character is in table 2.
embodiment 4
Solid aluminum chloride is joined in distilled water, heat and be stirred to dissolving, obtaining liquor alumini chloridi (a).Concentrated ammonia liquor is added appropriate distilled water diluting into about 10% weak aqua ammonia (b), powdery coconut husk charcoal adds in lysine solution and mixes, and liquid-solid volume ratio is 3:1, and then add water making beating, obtains active carbon slurries (c).Waterglass according to 1:2 dilution proportion in deionized water, be configured to solution (d).(a) is added and after being heated with stirring to 65 DEG C in plastic cans, open the valve of the container having (b), control, within 10 minutes, system in tank is added drop-wise to pH=4.5, continue to drip (b), open the valve of the container having (c), control, in 30 minutes, system in tank is added drop-wise to pH=8.0, control the valve of the container of (c), ensure now to be added dropwise to complete.Keep temperature to be 65 DEG C, pH=8.0, stops after 20 minutes, in system, adds solution (d), is that 45wt% calculating added in 10 minutes according to the content of silica in amorphous aluminum silicide.Aging 1 hour, filtered by material in tank, washing to without chlorion, is filtered, and by filter cake drying 10 hours at 110 DEG C, obtains carrier material A-4.Then roasting 5 hours under 550 DEG C of conditions under nitrogen protection, pulverizes and sieves and obtains powder carrier J-4.The amount of plastic agents useful for same lists in table 1.
Get carrier material A-4 100 grams, form paste, extruded moulding with the peptization liquid comes into contact containing nitric acid, then at 110 DEG C dry 10 hours, under nitrogen protection, under 550 DEG C of conditions, roasting, after 5 hours, obtained shaping catalyst carrier Z-4, and its character is in table 2.
embodiment 5
Solid aluminum sulfate is joined in distilled water, heat and be stirred to dissolving, obtaining aluminum sulfate solution (a).Concentrated ammonia liquor is added appropriate distilled water diluting into about 10% weak aqua ammonia (b).Powdery coconut husk charcoal adds in lysine solution and mixes, and liquid-solid volume ratio is 3:1, and then add water making beating, obtains active carbon slurries (c).Waterglass according to 1:2 dilution proportion in deionized water, be configured to solution (d).(a) is added and after being heated with stirring to 65 DEG C in plastic cans, open the valve of the container having (b), control, within 10 minutes, system in tank is added drop-wise to pH=4.5, continue to drip (b), open the valve of the container having (c), control, in 30 minutes, system in tank is added drop-wise to pH=8.0, control the valve of the container of (c), ensure now to be added dropwise to complete.Keep temperature to be 65 DEG C, pH=8.0, stops after 20 minutes, in system, adds solution (d), is that 55wt% calculating added in 10 minutes according to the content of silica in amorphous aluminum silicide.Aging 1 hour, material in tank is filtered, wash to sulfate radical-free ion, filter, by filter cake at 110 DEG C dry 10 hours, obtain carrier material A-5.Then roasting 5 hours under 550 DEG C of conditions under nitrogen protection, pulverizes and sieves and obtains powder carrier J-5.The amount of plastic agents useful for same lists in table 1.
Get carrier material A-5 100 grams, form paste, extruded moulding with the peptization liquid comes into contact containing nitric acid, then at 110 DEG C dry 10 hours, under nitrogen protection, under 550 DEG C of conditions, roasting, after 5 hours, obtained shaping catalyst carrier Z-5, and its character is in table 2.
Comparative example 1
Solid aluminum sulfate is joined in distilled water, heat and be stirred to dissolving, obtaining aluminum sulfate solution (a).Concentrated ammonia liquor is added appropriate distilled water diluting into about 10% weak aqua ammonia (b).Waterglass according to 1:2 dilution proportion in deionized water, be configured to solution (c).In plastic cans, add (a) and after being heated with stirring to 65 DEG C, opening the valve of the container having (b), control, in 30 minutes, system in tank is added drop-wise to pH=8.0.Keep temperature to be 65 DEG C, pH=8.0, stops after 20 minutes, in system, adds solution (c), is that 50wt% calculating added in 10 minutes according to the content of silica in amorphous aluminum silicide.Aging 1 hour, material in tank is filtered, wash to sulfate radical-free ion, filter, by filter cake at 110 DEG C dry 10 hours, obtain carrier material PA-1, its appearance white.
Get carrier material PA-1 100 grams, form paste, extruded moulding with the peptization liquid comes into contact containing nitric acid; then at 110 DEG C dry 10 hours, under nitrogen protection, under 550 DEG C of conditions, roasting, after 5 hours, obtained shaping catalyst carrier DZ-A; its appearance white, its character is in table 2.Then with containing the impregnation fluid of Ce-Cu, then at 110 DEG C dry 10 hours, roasting 5 hours under 550 DEG C of conditions under nitrogen protection, obtain catalyst DA, its composition was in table 3.
Comparative example 2
Active carbon 100g used in embodiment 2 is formed paste with the peptization liquid comes into contact containing nitric acid; extruded moulding; then at 110 DEG C dry 10 hours; roasting after 5 hours under 550 DEG C of conditions under nitrogen protection; obtain shaping catalyst carrier DZ-B; its outward appearance is black, then adopts the impregnated activated metal component of method of embodiment 2, obtains catalyst DB.
Comparative example 3
By active carbon used in embodiment 2 with carrier material PA-1 physical mixed; paste is formed with the peptization liquid comes into contact containing nitric acid; extruded moulding; then at 110 DEG C dry 10 hours; under nitrogen protection, under 550 DEG C of conditions, roasting, after 5 hours, obtains shaping catalyst carrier DZ-C, and wherein activated carbon content is 50wt%; amorphous aluminum silicide content is 50wt%, its outward appearance black.Then adopt the impregnated activated metal component of method of embodiment 2, obtain catalyst DC.
Comparative example 4
Repeat the synthesis of embodiment 2, in plastic process, do not add amino acid, obtained catalyst carrier material PA-2 and powder carrier DF-2.
Preformed catalyst carrier preparation, with embodiment 2, obtains shaping catalyst carrier DZ-D.Active metal and carrying method, with embodiment 2, obtain catalyst DD, and its composition is in table 3.
Table 1 plastic agents useful for same quality
The character of table 2 catalyst carrier
The composition of table 3 catalyst
As can be seen from the character of catalyst carrier in table 2, the catalyst carrier obtained after adopting amino acid process active carbon with do not add compared with catalyst carrier that amino acid obtains, bulk property is improved.
Be canescence by the carrier material of embodiment of the present invention gained and the outward appearance of carrier, without obvious black, illustrate that active carbon becomes the core of carrier material and carrier.
In the present invention, X-ray photoelectron spectroscopy (XPS) element to embodiment and comparative example 1 gained surfaces of carrier materials is adopted to analyze.From analysis result, the element composition on embodiment gained carrier material A-1 ~ A-5 surface forms substantially identical with PA-1, all has the elemental carbon of trace.This further illustrates, and carrier material of the present invention is core with active carbon, take contained amorphous silica-alumina dry glue as shell.
Catalyst prepared by the catalyst of the invention described above catalyst support preparation and comparison vehicle thereof is evaluated.
Catalyst packing, in bubbling bed reactor, take ozone as oxide isolation, carries out batch (-type) process to certain oil plant containing phenol, sulfur-containing waste water.
Major pollutants COD:1500mg/L, S in waste water
2-: 280mg/L, volatile phenol: 180mg/L.
Treatment conditions are normal temperature and pressure, catalyst amount 100g, waste water 200ml, ozone amount 35mg/L, time of staying 30min.After catalyst uses 4 times, handled waste water the results are shown in table 4.
Table 4 evaluation result
As can be seen from table 4 evaluation result, waste water after treatment can meet qualified discharge Two-stage control index request.The catalyst using the inventive method to prepare has good activity.
After catalyst uses 100 times, evaluation result lists in table 5.
Table 5 estimation of stability result
As can be seen from table 5 result, the catalyst using this method to prepare has good stability.
Claims (15)
1. a preparation method for catalytic wet oxidation catalyst carrier, comprising:
(1) by 150 order ~ 300 object active carbons with after amino acid process, then to pull an oar;
(2) in amorphous aluminum silicide plastic process, introduce the active carbon slurries that step (1) obtains;
(3) material after the plastic that obtains of step (2) carry out aging, filter, washing, dry, obtain catalyst carrier material;
(4) carrier material of step (3) gained is made catalyst carrier.
2. in accordance with the method for claim 1, it is characterized in that: with 150 order ~ 300 object active carbons for core, take amorphous aluminum silicide as shell, with the weight of carrier for benchmark, the content of active carbon is 10% ~ 70%, and the content of amorphous aluminum silicide is 30% ~ 90%.
3. in accordance with the method for claim 1, it is characterized in that: described catalyst carrier, with the weight of carrier for benchmark, the content of active carbon is 30% ~ 70%, and the content of amorphous aluminum silicide is 30% ~ 70%.
4. in accordance with the method for claim 1, it is characterized in that: the amino acid consumption described in step (1) accounts for 5% ~ 20% of activated carbon weight.
5. in accordance with the method for claim 1, it is characterized in that: the amino acid described in step (1) is the hydrophilic amino acid that carbon number is less than 20.
6. in accordance with the method for claim 1, it is characterized in that: the amino acid described in step (1) is one or more in glycine, serine, threonine, cysteine, tyrosine, asparagine, glutamine, lysine, arginine, histidine, aspartic acid, glutamic acid.
7. in accordance with the method for claim 1, it is characterized in that: the amino acid described in step (1) is one or more in aspartic acid, glutamic acid, lysine.
8. in accordance with the method for claim 1, it is characterized in that the character of step (1) described active carbon is as follows: specific area 500 ~ 3000m
2/ g, pore volume 0.5 ~ 1.8cm
3/ g, average pore radius 1 ~ 10nm.
9. in accordance with the method for claim 1, the active carbon making beating that it is characterized in that described in step (1) adopt add water, one or more in low-carbon alcohols pull an oar, wherein low-carbon alcohols to be carbon number be in the monohydric alcohol of 1 ~ 5 one or more.
10. in accordance with the method for claim 1, it is characterized in that: step (1) amino acid process active carbon is directly mixed with active carbon by amino acid, or amino acid is dissolved in solvent and adds active carbon again, solvent is wherein water, carbon number is one or more in the monohydric alcohol of 1 ~ 5; During amino acid process active carbon, its liquid-solid volume ratio is below 10.
11. in accordance with the method for claim 1, it is characterized in that: the plastic process of the amorphous aluminum silicide described in step (2) is the neutralization reaction process of acid material and alkaline material, plastic process adopts the mode of the continuous acid-base titration of soda acid, or adopts two kinds of materials and the mode of stream neutralization.
12. in accordance with the method for claim 1, it is characterized in that: in step (2), the incorporation way of the mixture of step (1) gained adopts the one or more combination of following manner: this mixture, in plastic neutralization reaction process, adds in plastic cans by (1) continuously; (2) this mixture is first joined in plastic cans, then will prepare in the acid material of amorphous aluminum silicide and alkaline material and plastic; (3) one or more with plastic material of this mixture are mixed, then in plastic material and plastic.
13. in accordance with the method for claim 1, it is characterized in that: in step (3), described drying condition is as follows: drying 1 ~ 15 hour at 50 ~ 150 DEG C.
14. in accordance with the method for claim 1, it is characterized in that: the preparation of step (4) catalyst carrier at least adopts one of following method:
A, by the carrier material of step (3) gained, roasting under inert gas shielding, obtains catalyst carrier;
B, by shaping for the carrier material of step (3) gained, after drying, roasting under inert gas shielding, obtains catalyst carrier;
C, by carrier material roasting under inert gas shielding of step (3) gained, and then through shaping, after drying, roasting under inert gas shielding, obtains catalyst carrier.
15. in accordance with the method for claim 14, it is characterized in that: in step (4), roasting condition described in method A is as follows: sintering temperature is 450 ~ 700 DEG C, roasting time is 1 ~ 10 hour, drying condition described in method B is at 80 ~ 200 DEG C, dry 1 ~ 15 hour, sintering temperature is 450 ~ 700 DEG C, roasting time is generally 1 ~ 10 hour, in method C, by carrier material roasting under inert gas shielding of step (3) gained, described roasting condition is as follows: sintering temperature is 450 ~ 700 DEG C, roasting time is 1 ~ 10 hour, and then through shaping, after drying, roasting under inert gas shielding, obtain catalyst carrier, drying condition after shaping is as follows: at 80 ~ 200 DEG C, dry 1 ~ 15 hour, roasting condition is as follows: sintering temperature is 450 ~ 700 DEG C, roasting time is 1 ~ 10 hour.
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| JP2006347919A (en) * | 2005-06-14 | 2006-12-28 | Mitsubishi Rayon Co Ltd | Method for producing unsaturated carboxylic acid ester |
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| WO2012027194A2 (en) * | 2010-08-25 | 2012-03-01 | Saint-Gobain Ceramics And Plastics, Inc. | Boron nitride with attached mettalic particles, methods of making, and uses thereof |
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| CN1717278A (en) * | 2002-11-20 | 2006-01-04 | 埃克森美孚研究工程公司 | Methods for preparing catalysts |
| JP2006347919A (en) * | 2005-06-14 | 2006-12-28 | Mitsubishi Rayon Co Ltd | Method for producing unsaturated carboxylic acid ester |
| US20080274036A1 (en) * | 2005-06-28 | 2008-11-06 | Resasco Daniel E | Microstructured catalysts and methods of use for producing carbon nanotubes |
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