CN104492405B - Core-shell type molecular sieve microsphere as well as preparation method and application thereof - Google Patents

Core-shell type molecular sieve microsphere as well as preparation method and application thereof Download PDF

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CN104492405B
CN104492405B CN201410738437.5A CN201410738437A CN104492405B CN 104492405 B CN104492405 B CN 104492405B CN 201410738437 A CN201410738437 A CN 201410738437A CN 104492405 B CN104492405 B CN 104492405B
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molecular sieve
core
type molecular
microsphere
ion
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CN104492405A (en
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张利雄
于爽
曾昌凤
王重庆
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Nanjing Tech University
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
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Abstract

The invention relates to a core-shell type molecular sieve microsphere as well as a preparation method and application thereof. The core-shell type molecular sieve microsphere is characterized by having the structure that an A type molecular sieve serves as a shell, and an A-X type molecular sieve serve as a core. The preparation method of the core-shell type molecular sieve microsphere comprises the following steps of: preparing a NaA-NaX type molecular sieve composite microsphere in advance, then growing a layer of NaA type molecular sieve film on the surface of the NaA-NaX type molecular sieve composite microsphere to form a Na-ion type core-shell molecular sieve microsphere, and exchanging ions by using a K ion solution and a Ca ion solution to form a K-Ca type core-shell molecular sieve microsphere. The core-shell type molecular sieve microsphere prepared by adopting the preparation method contains no binder, has high mechanical strength and is suitable for separating a CO2-CH4 mixture, a CO2-N2 mixture and a CH4-N2 mixture. The preparation method of the core-shell type molecular sieve microsphere is simple and is suitable for industrial production.

Description

A kind of core-shell type molecular sieve microsphere and its production and use
Technical field
The present invention relates to a kind of core-shell type molecular sieve micro-sphere material and its production and use is and in particular to by this side Method one step prepares the complex microsphere with naa and nax mixing crystal formation, prepares with a type molecular sieve after the synthesis of long film For fine and close shell, a and x type molecular sieve is the core-shell type molecular sieve microsphere of core.It is primarily useful for the adsorbing separation of gas, increase co2And ch4、n2The separation factor of bi-component gas.
Background technology
Greenhouse effect produced by CO2 emission is an alarming global environmental problem, most co2How being produced by fossil-fueled of discharge, efficiently separate and trapping co from flue gas2For reduction greenhouse gases Discharge is significant.In addition, co2It is also main foreign gas in natural gas and biogas, co2Presence can have a strong impact on The unit energy content of natural gas and biogas, removes co therefore from natural gas and biogas2There is important practical significance.Low dense Degree coal bed gas is then a kind of Unconventional forage, and main component is ch4And n2, wherein (ch4) it is less than 30%, lead to coal bed gas difficult Directly to utilize, or traditional processing mode is directly vented, or low concentration burns, waste of resource also pollutes environment, with When due to ch4And n2Molecule activity diameter close to and be difficult to separate, if can not solve cannot be good for the thickening problem of methane Coal bed gas is developed and utilized.Therefore, a kind of environmental friendliness, stable performance, economic and practical co are developed2/ch4、co2/ n2、ch4/n2Adsorption and separation material is the study hotspot of gas absorption separation field.The isolation technics being directed to these gases are main Including absorption, absorb, membrance separation and freeze and separate etc., wherein membrane separating method has that energy consumption is low, and the advantages of pollution-free, but film divides From higher for equipment and material requirements.Ammonia and the easy etching apparatus of double Alkali absorption method and regeneration difficulty greatly, reclaim difficult, Its application is very limited.Solid absorbent is simple to operate, corrosion-free to equipment when using, be relatively easy to regeneration, performance Stable, save energy, has therefore expedited the emergence of the research boom of solid adsorption material.
Zeolitic material, because having the advantages of well-regulated nano-pore structure and good heat stability, can be used for the suction of gas Echo separation field.As caa zeolite molecular sieve is added to enough ccl by patent (cn 102350303a)4In solvent, stirring Under the conditions of time of infusion；Remove ccl4Solvent, adds kcl solution, carries out rapid filtration under suction, sucking filtration does not stop to stir after stirring simultaneously Mix and add water flushing；Finally prepared kcaa zeolite molecular sieve is placed in 50 DEG C of baking ovens and is dried, and is subsequently put in vacuum drying oven and lives Change a period of time.Obtain kcaa zeolite molecular sieve for co2Adsorbance be 4mmol/g, for co2/n2Selectivity is up to 129. A type molecular sieve after specific process ion exchange is for co2/n2Selectivity ratios higher, preparation method is simple, but for co2Adsorbance be not very high, and the zeolitic material after this synthesis is powder, unfavorable with industrial practical application.Except entering Row ion-exchanged, can also reach the effect of the adsorption seperation of gas of molecular sieve by methods such as acid treatments, such as patent (cn 102219235a) na type molecular sieve be impregnated in the h of 3m2so4In solution, uniform stirring, standing 1h filters, drying at room temperature 24h, It is dried under the conditions of 100 DEG C, after roasting, obtain a/h-na.The a/h-na molecular sieve of the method preparation, preparation process is simple, for ch4/n2Separation factor reach 2.66, can be used for pressure-variable adsorption and separate, but selectivity needs to be improved further.Document Sodium aluminate solution is added drop-wise to sodium hydroxide, hydrogen by (chemical engineering journal, 2013,230,380 388) In potassium oxide and Ludox mixed solution, it is used tetramethyl oxyammonia to prepare t type molecular sieve as structure directing agent, Under the conditions of 288k, 100kpa, to co2、ch4、n2Adsorbance be respectively 4.81mmol/g, 0.99mmol/g and 1.72mmol/g. To co2/ch4、co2/n2、ch4/n2Gas selectivity be 4.9,2.8 and 1.7 respectively.The t type molecular sieve of the method preparation is brilliant Grain is little, to co2、ch4And n2Adsorbance all higher, but selectivity or relatively low.
The patent of research zeolitic solid adsorbent and document great majority are based on dusty material at this stage.Dusty material exists Occur in commercial Application that powder dress agent dust is big, the problems such as difficult separation and recycling, discharge carry serious secretly.Zeolite formed product is solution The certainly key of zeolite powder industrial problems, common method is to add binding agent, and extrusion shapes.As patent (cn 1103816a) use nay zeolite and clay class Kaolin, expanding agent mixing extrusion molding, drying, roasting, alkali process are obtained The nay zeolite of soap-free emulsion polymeization dosage form is the Zeolite support of main body.But the use of binding agent can reduce consolidating of zeolite in formed body to be contained Amount, and binding agent does not have molecular sieve property, can block the duct of molecular sieve, and then affect molecular sieve catalytic performance and select to inhale Attached ability.The preparation method of Adhesive-free Molecular Sieve formed body has also been widely studied, and such as patent (cn 103508463a) will Sodium silicate aqueous solution and peptizer solution mixing system, for colloidal sol, are prepared into hydrogel bead by forming oil column, through washing, always Change, be dried, silica dioxide gel bead is made in roasting, adding sodium metaaluminate and directed agents, after crystallization, be dried to obtain binder free Spherical faujasite granule.Patent (cn 101348261) is with least in kieselguhr, white carbon, Ludox or waterglass Planting is silicon source, with least one of the oxide of aluminum, aluminium salt or aluminate as aluminium source raw material, adds the desired amount of seeding director Carry out kneading extruded moulding, process through hydrothermal crystallizing and obtain binder free zsm-11 moulded zeolite.Although said method is prepared Binder free zeolitic material, but complex steps, process is complicated, increases life cycle of the product, improves preparation cost.
Therefore, develop a kind of preparation process simply, the complicated high adsorption capacity exchanging and processing, high selectivity need not be carried out Adhesive-free Molecular Sieve micro-sphere material has very great practical significance and using value.
Content of the invention
The invention aims to improve prior art prepare binder free zeolitic material and its gas separate apply The deficiency of aspect, and develop a kind of core-shell type molecular sieve microsphere of binder free；It is a further object of the present invention to provide it is above-mentioned The preparation method of core-shell type molecular sieve microsphere, further object of the present invention is to provide above-mentioned core-shell type molecular sieve microsphere in co2、 n2And ch4Application in bi-component gas adsorbing separation.
The technical scheme is that a kind of core-shell type molecular sieve microsphere it is characterised in that using a type molecular sieve as shell, a It is the core-shell particles structure of core with x type molecular sieve；In its center, the quality of x type molecular sieve accounts for the 50%-90% of nuclear mass；Nucleocapsid The particle size range of microsphere is 0.5-3.0mm, and shell thickness is 1-12 μm；Core-shell type molecular sieve microsphere is na ion-type, ca ion Type or k ion-type.
Present invention also offers the preparation method of above-mentioned core-shell type molecular sieve microsphere: prepare naa and nax molecule one step ahead Sieve complex microsphere, then on naa and nax molecular sieve complex microsphere surface, one layer of naa type molecular screen membrane of growth forms na ion Type core-shell type molecular sieve microsphere；Or form the hud typed of K-type and ca type again after k solion and ca solion exchange Molecular sieve microsphere.Its concrete preparation process is as follows:
1), by shitosan, acetic acid and Ludox according to shitosan: hac:sio2: h2The mol ratio of o is (0.0003- 0.0009): (0.3-0.5): (1.35-2.7): (50-100) is configured to silicon solution；Again by sodium hydroxide, sodium aluminate and water according to na2O:al2o3: h2The mol ratio of o is (2.0-6.0): (1.0-3.0): (30-60) is configured to aluminum solutions；The silicon solution that will prepare It is added drop-wise in aluminum solutions, form spherical little particle, dipping, then hydro-thermal reaction, the spheroidal particle obtaining, through washing, dry To shitosan/naa/nax composite, roasting removes naa the and nax molecular sieve microsphere that shitosan obtains binder free；
2), according to sodium aluminate, sodium silicate and water mol ratio be (0.5-2.0): (0.3-1.2): (60-200) prepares long film Synthetic solvent, long film Synthesis liquid after aging, by step 1) be obtained naa and nax molecular sieve microsphere be added to aging after In long film synthetic solvent；After heating the synthesis of long film, by product be washed to neutrality and be dried to obtain naa be shell, naa and Nax is the na ion-type core-shell type molecular sieve microsphere of core；Or add in na ion-type core-shell type molecular sieve microsphere and contain k The aqueous solution of ion or ca ion carries out ion exchange, obtain after washing and drying k ion-type core-shell type molecular sieve microsphere or ca from Subtype core-shell type molecular sieve microsphere.
Preferred steps 1) in silicon solution be added drop-wise to the mass ratio (0.8-0.95) of silicon solution and aluminum solutions in aluminum solutions: 1.Excellent Select step 1) described in dip time be 6-24h；Described hydrothermal temperature is 60 DEG C -110 DEG C, and the hydro-thermal reaction time is 3-12h；Described washing is to be washed till ph for 7-9 using deionized water；Described baking temperature is 60 DEG C -80 DEG C, drying time For 4-8h；Described sintering temperature is 550 DEG C -600 DEG C, and roasting time is 1-2h.
Preferred steps 2) in the aging temperature of long film Synthesis liquid be 50-70 DEG C, ageing time be 0.5-1.0h.Preferred steps 2) in, naa/nax molecular sieve microsphere and the mass ratio of long film Synthesis liquid are 1:(10-20).Preferred steps 2) in heating long film synthesis Temperature be 80 DEG C -100 DEG C, the time be 4-48h；Long film synthesis number of times is 1-3 time；Described washing is to make to be washed with deionized water It is 7-9 to ph.Preferred steps 2) in k salt ion solution or ca salt ion solution concentration be 0.1-0.3mol/l；Ion exchange During core-shell type molecular sieve with the mass ratio of k salt ion solution or ca salt ion solution as 1:(30-60)；During ion exchange Between be 6-24h.
Present invention also offers above-mentioned core-shell type molecular sieve microsphere is in co2、ch4And n2In bi-component gas adsorbing separation Application.
Beneficial effect:
The core-shell type molecular sieve microsphere that the present invention prepares has compared with high selection absorbability and higher adsorbance, prepares Method is simple, to co2/ch4、co2/n2、ch4/n2The more general adsorbent of separation factor of mixed gas will height.This is hud typed simultaneously Molecular sieve microsphere has high mechanical properties, heat stability and corrosion resistance.The present invention is gone out using organic biomass one-step synthesis Naa/nax complex microsphere, forms with a type molecular sieve as shell after carrying out long film, a and x type molecular sieve is the hud typed molecule of core Sieve, can preferably play the adsorption selectivity of material using this special nucleocapsid structure.Additionally, this material produces week Phase is short, low cost and can repeat recycle, therefore can carry out use of large-scale production.
Brief description
Fig. 1 is the electron microscope of sample q1, and wherein (a) represents that sample q1 microsphere, (b) represent sample q1 microsphere surface, (c) table Sample product q1 core；
Fig. 2 is the electron microscope of sample q2, and wherein (a) represents that sample q2 bead interface, (b) represent sample q2 microsphere surface；
Fig. 3 is the electron microscope of sample q3, and wherein (a) represents that sample q3 bead interface, (b) represent sample q3 microsphere surface；
Fig. 4 is the electron microscope of sample q4, and wherein (a) represents that sample q4 bead interface, (b) represent sample q4 microsphere surface；
Fig. 5 is the electron microscope of sample q5, and wherein (a) represents that sample q5 bead interface, (b) represent sample q5 microsphere surface；
Fig. 6 is the electron microscope of sample q6, and wherein (a) represents that sample q6 bead interface, (b) represent sample q6 microsphere surface；
Fig. 7 is the xrd figure of sample q1 sample q1；
Fig. 8 is the xrd figure of sample q2；
Fig. 9 schemes for sample q3xrd；
Figure 10 is the xrd figure of sample q4；
Figure 11 schemes for sample q5xrd；
Figure 12 is the xrd figure of sample q6；
Figure 13 is sample q9 to co2/ch4Breakthrough curve；
Figure 14 is sample q9 to c02/n2Breakthrough curve.
Specific embodiment
Embodiment 1:
The Ludox of 8.3g 30% is added in 28.57g deionized water, then is added thereto to the shitosan of 1.0g, Under conditions of stirring in above-mentioned solution dropwise Deca 1.6g 36% acetic acid, after stirring, form sticky shitosan two Silica solution, the mol ratio of this silicon solution is 0.0004cs:0.3hac:1.4sio2:54h2o.5.68g sodium hydroxide is added To in 83.8g deionized water, after fully dissolving, add 2.24g sodium aluminate, stir to clarify, form aluminum solutions, this aluminum solutions Mol ratio be 3na2o:2al2o3:34h2o.Silicon solution is added drop-wise in aluminum solutions for 0.9:1 with mass ratio, is formed scattered Gelled pill.After completion of dropping, ball and aluminum solutions are impregnated 8h at ambient temperature, then by ball together with aluminum solutions 70 Hydro-thermal 12h in DEG C baking oven, the microsphere obtaining fully washs and 7h is dried under the conditions of 60 DEG C to ph=7, obtains final product naa/nax/ shell Polysaccharide complex microsphere.Naa/nax/ chitosan compound microsphere is put into Muffle furnace, roasting 2h, programming rate under the conditions of 550 DEG C For 2 DEG C/min, obtain naa the and nax complex microsphere of binder free, bead size is 0.5-3.0mm, is designated as sample q1, sample The electron microscope of q1 is as shown in figure 1, can be seen that from figure the surface of naa and nax complex microsphere is substantially that naa type cube is brilliant Grain, is substantially nax and naa type zeolite crystal at core, and wherein x type molecular sieve quality fraction is 60%.The xrd of q1 schemes such as It can be seen that a type and the characteristic peak of x type simultaneously shown in Fig. 7, and peak intensity is essentially identical.Will be molten for 7.8g nine water sodium silicate Solution forms solution a1 in 19.9g deionized water, and 3.0g sodium aluminate is dissolved in formation solution a2 in 11.0g deionized water, molten After solution finishes, a1 is poured slowly in a2 solution, under the conditions of 50 DEG C, stirs aging 1h, sodium aluminate in this long film synthetic solvent: Sodium silicate: water mol ratio is 1.4:1:64.Long film synthetic solvent is added in sample q1 with mass ratio 20:1, then by sample Q1 is placed in 100 DEG C of baking ovens lower crystallization 5h together with long film synthetic solvent, and the microsphere deionized water obtaining fully is washed to ph For 8,5h is dried under the conditions of 80 DEG C and obtains hud typed molecular sieve microsphere, be designated as sample q2, the interface of sample q2 and surface Electron microscope as shown in Fig. 2 as can be seen from the figure interface exist 1.0 μ m-thick shell, surface is to show intergrowth State.The xrd of sample q2 schemes as shown in figure 8, all a type and x type characteristic peak, will height before the longer film process of intensity.
Embodiment 2:
The Ludox of 10.9g 30% is added in 35.3g deionized water, then is added thereto to the shitosan of 2.0g, Under conditions of stirring in above-mentioned solution dropwise Deca 1.82g 36% acetic acid, after stirring, obtain silicon solution mole Than for 0.0008cs:0.5hac:2.5sio2:90h2o.6.05g sodium hydroxide is added in 40.8g deionized water, treats fully After dissolving, add 18.6g sodium aluminate, stir to clarify, form aluminum solutions, the mol ratio of this aluminum solutions is 5na2o:3al2o3: 60h2o.Silicon solution is added drop-wise to formation gelled pill in aluminum solutions with mass ratio for 0.8:1.After completion of dropping, ball is molten with aluminum Liquid impregnates 23h at ambient temperature, then together with aluminum solutions, ball is placed on hydro-thermal 4h in 100 DEG C of baking ovens, and obtain is micro- Ball fully washs to ph=8.Microsphere is dried 4h under the conditions of 80 DEG C, obtains final product naa/nax/ chitosan compound microsphere.By naa/ Nax/ chitosan compound microsphere puts into Muffle furnace, roasting 1h under the conditions of 600 DEG C, and programming rate is 5 DEG C/min, obtains soap-free emulsion polymeization Naa the and nax complex microsphere of agent, bead size is 1.5-3.0mm.Naa the and nax complex microsphere surface obtaining is mainly a type Molecular sieve, core is naa and nax molecular sieve mixed crystal, and wherein x type molecular sieve quality fraction is 90%.By 1.18g nine water silicon Sour sodium is dissolved in formation solution b1 in 20g deionized water, and 0.55g sodium aluminate is dissolved in formation solution b2 in 20g deionized water, After dissolving finishes, b1 is poured slowly in b2 solution, under the conditions of 70 DEG C, stirs aging 0.5h, aluminic acid in this long film synthetic solvent Sodium: sodium silicate: water mol ratio is 0.6:0.37:199.Long film synthetic solvent is added in sample q1 with mass ratio 10:1, so Afterwards sample q1 is placed in together with long film synthetic solvent in 85 DEG C of baking ovens lower crystallization 40h, the microsphere deionized water obtaining is abundant Washing to ph is 9,5h is dried and obtains hud typed molecular sieve microsphere, be designated as sample q3, the Electronic Speculum of sample q3 under the conditions of 80 DEG C As shown in figure 3, q3 surface microstructure is comparatively dense, microsphere intensity improves figure, but interface does not occur shell-like structure.Sample q3 Xrd scheme as shown in figure 9, a type and x type characteristic peak all occur.
Embodiment 3:
According to long film synthesis liquid and preparation method thereof in the same manner as in Example 1 and long film method, sample q2 with mass ratio is The ratio of 1:20 is added in long film Synthesis liquid, and crystallization 5h under the conditions of 100 DEG C carries out two vice-minister's films.Hud typed point obtaining Son sieve microsphere is designated as q4, and, as shown in figure 4, shell thickness is 3.8 μm, surface interaction growth fraction sample q2 will for the electron microscope of sample q4 Good.As shown in Figure 10, all a type and x type characteristic peak in the xrd figure of sample q3, and x type peak intensity is higher than the intensity of a.
Embodiment 4:
According to long film synthesis liquid and preparation method thereof in the same manner as in Example 1 and long film method, sample q4 with mass ratio is The ratio of 1:20 is added in long film Synthesis liquid, and crystallization 5h under the conditions of 100 DEG C carries out three vice-minister's films.Hud typed point obtaining Son sieve microsphere is designated as q5, as shown in figure 5, shell thickness is 10.7 μm, surface is in intergrowth to the electron microscope of sample q5, film layer base Originally there is no defect.As shown in figure 11, all a type and the x type characteristic peak of higher-strength in the xrd figure of sample q5.
Embodiment 5:
According to long film synthesis liquid and preparation method thereof in the same manner as in Example 2 and long film method, sample q3 with mass ratio is The ratio of 1:10 is added in long film Synthesis liquid, and crystallization 40h under the conditions of 85 DEG C carries out two vice-minister's films.Hud typed point obtaining Son sieve microsphere is designated as q6, as shown in fig. 6, shell thickness is 3.2 μm, surface is in intergrowth to the electron microscope of sample q6.Sample q6 Xrd figure as shown in figure 12, a type and the x type characteristic peak of higher-strength all occur.
Embodiment 6:
Prepare the calcium chloride solution of 0.1mol/l, 1.11g calcium chloride solution is added in 100g deionized water.Then will Calcium chloride solution is added in sample q5 with mass ratio 40:1, exchanges 10h under stirring condition.Remove calcium chloride solution, spend from Wash after sub- water punching and 6h is dried under the conditions of 60 DEG C.Obtain the core-shell type molecular sieve after calcium ion-exchanged, be designated as q7.
Embodiment 7:
Prepare the Klorvess Liquid of 0.1mol/l, 7.45g Klorvess Liquid is added in 100g deionized water.By chlorination Potassium solution is added in sample q5 and q6 with mass ratio for 50:1, exchanges 12h under stirring condition, removes Klorvess Liquid, spends Ionized water is dried 4h after rinsing under the conditions of 80 DEG C, obtains the long membrane molecule sieve after potassium ion exchanges, is designated as q8 and q9 respectively.
Embodiment 8:
Prepare the calcium sulphate soln of 0.25mol/l, 2.5g calcium sulphate soln is added in 100g deionized water.Then will Calcium sulphate soln is added in sample q5 with mass ratio 50:1, exchanges 20h under stirring condition.Remove calcium sulphate soln, spend from Sub- water is dried 4h after rinsing under the conditions of 80 DEG C.Obtain the core-shell type molecular sieve after calcium ion-exchanged, be designated as q10.
Embodiment 9:
Prepare the potassium nitrate solution of 0.25mol/l, 2.5g potassium nitrate solution is added in 100g deionized water.Then will Potassium nitrate solution is added in sample q6 with mass ratio 50:1, exchanges 20h under stirring condition.Remove potassium nitrate solution, spend from Sub- water is dried 4h after rinsing under the conditions of 80 DEG C, obtains the core-shell type molecular sieve after potassium ion exchanges, is designated as q11.
co2/ch4Breakthrough curve on sample q9 core-shell type molecular sieve is shown in Figure 13, and experiment condition is: test before with 2 DEG C/ The heating rate of min is heated to 300 DEG C, is incubated 4h, the helium with flow velocity as 10ml/min for the period not sweep by blow off, removes adsorbent Middle adsorbed impurity, then naturally cools to room temperature.Molecular sieve consumption=2.3g；Adsorptive pressure=101.3kpa, absorption temperature Degree=298k；Adsorption tube entrance adds co2And ch4Flow velocity is respectively the gaseous mixture of 1.7ml/min and 2.3ml/min, using peace The each gas concentration in Jie Lun (7820a) chromatography of gases on-line determination exit, time dependent according to measured gas concentration Data draws breakthrough curve.co2/ch4Breakthrough curve is shown in initial 1500s, co2Adsorbed completely, ch4Substantially not by Absorption.,After 1500s, exit co2Concentration is gradually increased, during about 2500s outlet co2 concentration suitable with air inlet it is meant that suction Attached reach saturation.
Breakthrough curve on sample q9 core-shell type molecular sieve for the co2/n2 is shown in Figure 14, and experiment condition is: test before with 2 DEG C/ The heating rate of min is heated to 300 DEG C, is incubated 4h, the helium with flow velocity as 10ml/min for the period not sweep by blow off, removes adsorbent Middle adsorbed impurity, then naturally cools to room temperature.Molecular sieve consumption=2.3g；Adsorptive pressure=101.3kpa, absorption temperature Degree=298k；Adsorption tube entrance adds co2And n2Flow velocity is respectively the gaseous mixture of 1.5ml/min and 7.8ml/min, using peace The each gas concentration in Jie Lun (7820a) chromatography of gases on-line determination exit, time dependent according to measured gas concentration Data draws breakthrough curve.co2/n2Breakthrough curve is shown in initial 500s, co2Adsorbed completely, n2Do not adsorb.2000s Afterwards, exit co2Concentration is gradually increased, and during about 2000s, outlet co2 concentration is suitable with air inlet reaches saturation it is meant that adsorbing.
Table 1 sample is to n2、ch4、co2The adsorbance of single-component gas
* condition: temperature is 298k, pressure is 100kpa

Claims (7)

1. a kind of method preparing core-shell type molecular sieve microsphere, its concrete preparation process is as follows:
1), by shitosan, acetic acid and Ludox according to shitosan: hac:sio2: h2The mol ratio of o is (0.0003-0.0009): (0.3-0.5): (1.35-2.7): (50-100) is configured to silicon solution；Again by sodium hydroxide, sodium aluminate and water according to na2O: al2o3: h2The mol ratio of o is (2.0-6.0): (1.0-3.0): (30-60) is configured to aluminum solutions；The silicon solution Deca that will prepare To in aluminum solutions, form spherical little particle, dipping, then hydro-thermal reaction, the spheroidal particle obtaining, through washing, be dried to obtain shell Polysaccharide/naa/nax composite, roasting removes naa the and nax molecular sieve microsphere that shitosan obtains binder free；
2) it is, (0.5-2.0): (0.3-1.2) according to sodium aluminate, sodium silicate and water mol ratio: (60-200) prepares the synthesis of long film Solution, long film Synthesis liquid after aging, by step 1) be obtained naa and nax molecular sieve microsphere be added to aging after long film In synthetic solvent；After heating the synthesis of long film, by product be washed to neutrality and be dried to obtain naa be shell, naa and nax be The na ion-type core-shell type molecular sieve microsphere of core；Or add in na ion-type core-shell type molecular sieve and contain k ion or ca The aqueous solution of ion carries out ion exchange, obtains k ion-type core-shell type molecular sieve microsphere or ca ion-type nucleocapsid after washing and drying Type molecular sieve microsphere；Using a type molecular sieve as shell, a and x type molecular sieve is the nucleocapsid of core to obtained core-shell type molecular sieve microsphere Micro-sphere structure；In its center, the quality of x type molecular sieve accounts for the 50%-90% of nuclear mass；The particle size range of core-shell particles is 0.5- 3.0mm, shell thickness is 1-12 μm；Core-shell type molecular sieve microsphere is na ion-type, ca ion-type or k ion-type.
2. in accordance with the method for claim 1 it is characterised in that step 1) in silicon solution be added drop-wise in aluminum solutions silicon solution with The mass ratio (0.8-0.95) of aluminum solutions: 1.
3. method according to claim 1 is it is characterised in that step 1) described in dip time be 6-24h；Described Hydrothermal temperature is 60 DEG C -110 DEG C, and the hydro-thermal reaction time is 3-12h；Described washing is to be washed till ph using deionized water to be 7-9；Described baking temperature is 60 DEG C -80 DEG C, and drying time is 4-8h；Described sintering temperature is 550 DEG C -600 DEG C, roasting Time is 1-2h.
4. method according to claim 1 is it is characterised in that step 2) in the aging temperature of long film Synthesis liquid be 50-70 DEG C, ageing time is 0.5-1.0h.
5. in accordance with the method for claim 1 it is characterised in that step 2) in naa/nax molecular sieve microsphere and long film Synthesis liquid Mass ratio be 1:(10-20).
6. in accordance with the method for claim 1 it is characterised in that step 2) in the temperature of heating long film synthesis be 80 DEG C -100 DEG C, the time is 4-48h；Long film synthesis number of times is 1-3 time；Described washing is to be washed till ph for 7-9 using deionized water.
7. in accordance with the method for claim 1 it is characterised in that step 2) in k salt ion solution or ca salt ion solution dense Spend for 0.1-0.3mol/l；The quality of core-shell type molecular sieve and k salt ion solution or ca salt ion solution in ion exchange process Than for 1:(30-60)；Ion-exchange time is 6-24h.
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CN112973624A (en) * 2021-03-23 2021-06-18 南京永成分子筛有限公司 High-efficiency 4A molecular sieve
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