CN115069210A - Preparation method of silver-containing supported adsorbent - Google Patents
Preparation method of silver-containing supported adsorbent Download PDFInfo
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- CN115069210A CN115069210A CN202210714959.6A CN202210714959A CN115069210A CN 115069210 A CN115069210 A CN 115069210A CN 202210714959 A CN202210714959 A CN 202210714959A CN 115069210 A CN115069210 A CN 115069210A
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- 239000003463 adsorbent Substances 0.000 title claims abstract description 39
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 16
- 239000004332 silver Substances 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 78
- 238000000034 method Methods 0.000 claims abstract description 36
- 239000002808 molecular sieve Substances 0.000 claims abstract description 26
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000011812 mixed powder Substances 0.000 claims abstract description 22
- 238000011068 loading method Methods 0.000 claims abstract description 8
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims abstract description 6
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 6
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 6
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 6
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 6
- 238000004898 kneading Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 6
- 241000219782 Sesbania Species 0.000 claims description 5
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 abstract description 21
- 229910021645 metal ion Inorganic materials 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 2
- 244000275012 Sesbania cannabina Species 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 17
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000001875 compounds Chemical group 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 150000002500 ions Chemical group 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0233—Compounds of Cu, Ag, Au
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
- B01J20/0296—Nitrates of compounds other than those provided for in B01J20/04
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
- B01J20/186—Chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the activity, also decreasing the activity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28011—Other properties, e.g. density, crush strength
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- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a preparation method of a silver-containing supported adsorbent, which comprises the following steps: step one, selecting a Y molecular sieve or a beta molecular sieve with high silicon-aluminum ratio as an adsorbent carrier; adding a certain amount of AgNO3 solid into water under the conditions of light protection and normal temperature, stirring and dissolving to obtain an AgNO3 solution with a certain concentration; step three, fully mixing the selected Y or beta molecular sieve, pseudo-boehmite, hydroxypropyl methyl cellulose and sesbania powder according to a certain mass ratio to obtain mixed powder, kneading the mixed powder, simultaneously, uniformly dropwise adding the prepared AgNO3 solution into the mixed powder under the condition of keeping out of the sun to obtain a mixed material, and then preparing the mixed material into a strip-shaped or spherical sample; and step four, naturally airing the obtained sample under the conditions of normal temperature and light resistance, and roasting at high temperature to obtain the silver-containing supported adsorbent product. The product prepared by the method has two functions of physical adsorption and chemical adsorption by loading metal ions, so that the adsorption capacity is improved.
Description
Technical Field
The invention relates to a preparation method of a silver-containing supported adsorbent, belonging to the technical field of adsorbents.
Background
The main methods for preparing metal ion supported adsorbents in industrial application at present are as follows:
(1) the dipping method comprises the following steps: soaking the adsorbent carrier or main body in metal salt solution of certain concentration, contacting for certain time, removing residual liquid to load active component onto the carrier in ion or compound form, drying, roasting, activating and other steps to obtain the highly activated supported adsorbent.
(2) Ion exchange method: firstly, preparing a dilute solution of metal salt with a certain concentration, fully dispersing an adsorbent carrier in the solution and stirring, after a certain period of time, carrying out suction filtration and washing on the solution, and separating out solid in the solution. The active ingredients can be loaded on the carrier, and then the highly activated loaded adsorbent is obtained through the steps of drying, roasting, activating and the like.
However, the existing methods for preparing metal ion supported adsorbents still have some problems, mainly as follows:
(1) the adsorbent prepared by the method has the defects that the metal ions are not firmly loaded on the carrier, and the loading rate is not high enough, so that the adsorption effect of the adsorbent cannot meet the requirement in the industrial application process.
(2) The two methods are complicated in the process of preparing the catalyst, more equipment is needed, the production time is long, and the adsorption effect cannot be normally realized under the high-humidity working condition.
Disclosure of Invention
The invention aims to provide a preparation method of a silver-containing supported adsorbent, which solves the problems that the adsorption efficiency of a product prepared by the traditional adsorbent preparation method is too low, the actual use requirement cannot be met, the traditional adsorbent preparation method is too complicated in process, the required time and economic cost are too high, and the high-humidity working condition is ineffective.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for preparing a silver-containing supported adsorbent, comprising the steps of:
step one, selecting a molecular sieve with a high silicon-aluminum ratio as an adsorbent carrier;
step two, preparing silver nitrate solution: under the conditions of light protection and normal temperature, adding a certain amount of AgNO3 solid into water, stirring and dissolving to obtain AgNO3 solution with a certain concentration;
step three, forming and loading: mixing the selected molecular sieve with high silica-alumina ratio, pseudo-boehmite, hydroxypropyl methylcellulose and sesbania powder according to the weight ratio of 100: 20-30: 1-2: 2-5 to obtain mixed powder, adding the mixed powder into a kneader for kneading, simultaneously, uniformly dropwise adding the prepared AgNO3 solution into the mixed powder under the condition of keeping out of the sun to obtain a kneaded mixture, and then preparing the mixture into a sample with a shape;
step four, drying and roasting: and naturally airing the obtained sample at normal temperature in a dark place, and roasting at high temperature to obtain the silver-containing supported adsorbent product.
Further, in the first step, the molecular sieve with high silica alumina ratio is a Y molecular sieve, the molecular formula of the Y molecular sieve is Na56[ Al56Si136O384 ]. 250H2O, and the silica alumina ratio is 250-350, preferably 300.
Further, in the first step, the molecular sieve with high silica alumina ratio is a beta molecular sieve, the molecular formula of the beta molecular sieve is | Na7| [ Al7Si57O128], and the silica alumina ratio is 200-.
Further, in the second step, the AgNO3 solid is added into water and stirred to be dissolved for 0.5-1h, and the concentration of the obtained AgNO3 solution is 0.1-0.25 mol/L.
Further, the concentration of the AgNO3 solution is 0.25 mol/L.
Further, in the third step, the selected molecular sieve with high silica-alumina ratio, pseudo-boehmite, hydroxypropyl methylcellulose and sesbania powder are mixed according to the weight ratio of 100: 20: 1: 3 to obtain mixed powder.
Further, in the third step, the mixed powder is kneaded in a kneader for 2-4h, and the mass ratio of the mixed powder to the AgNO3 solution in the mixed material is 2.5-3.
Furthermore, the mass ratio of the mixed powder to the AgNO3 solution in the mixed material is 3.
Further, in the third step, the mixture is made into a strip-shaped or spherical sample through a screw extruder or a pelletizer.
Further, in the fourth step, the sample is naturally dried for 24-48 h under the conditions of normal temperature and light resistance, the roasting temperature of the sample in a muffle furnace is kept at 600 ℃, the programmed heating rate is 8-10 ℃/min, and the roasting time is 4-5 h.
Compared with the prior art, the invention has the following beneficial effects:
(1) in the traditional method for preparing the adsorbent, the loading and the forming are carried out in two steps, so that the preparation efficiency is low and the cost is high. According to the method, the load is integrated in the forming process, AgNO3 solution is uniformly dripped into the kneading machine to replace water originally required by kneading, so that the metal loading effect is achieved, the mixture can be formed smoothly, the preparation process is simplified, and the production cost is saved.
(2) Conventional adsorbent products tend to function only by physically adsorbed van der waals forces when in use. The product prepared by the method has two functions of physical adsorption and chemical adsorption simultaneously by loading metal ions, so that the adsorption capacity is improved.
(3) Traditional adsorbent products tend to have poor adsorption under high humidity conditions. The method adopts the Y or beta molecular sieve with high silicon-aluminum ratio as a carrier, thereby avoiding the problem. The high-silicon Y and high-silicon beta molecular sieves have excellent hydrophobicity, and can be used as a carrier to remarkably improve the adsorption performance of the adsorbent under a high-humidity condition.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a graph comparing adsorption curves of samples prepared by the method and the conventional method under the same conditions;
FIG. 2 is a graph comparing the adsorption curves of samples prepared by the method under different humidity conditions.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The embodiment provides a preparation method of a silver-containing supported adsorbent, which comprises the following steps:
step one, selecting a Y molecular sieve (the molecular formula is Na56[ Al56Si136O384 ]. 250H2O, the silicon-aluminum ratio is 300) or a beta molecular sieve (the molecular formula is | Na7| [ Al7Si57O128, the silicon-aluminum ratio is 250) with high silicon-aluminum ratio as an adsorbent carrier;
step two, preparing silver nitrate solution: under the conditions of whole course light shielding and normal temperature, adding a certain amount of AgNO3 solid into water, stirring and dissolving for 1h, and enabling the concentration of AgNO3 solution to be 0.25 mol/L;
step three, forming and loading: mixing the selected Y or beta molecular sieve with pseudo-boehmite, hydroxypropyl methylcellulose and sesbania powder according to the weight ratio of 100: 20: 1: 3, fully mixing the components in a mass ratio to obtain mixed powder; and adding the mixed powder into a kneader to be kneaded for 2 hours, and simultaneously, uniformly dropwise adding the prepared AgNO3 solution into the mixed powder under the condition of keeping out of the sun, wherein the mass ratio of the mixed powder to the AgNO3 solution is 3, so as to obtain a kneaded mixture. Preparing the mixture into a strip-shaped or spherical sample by a screw extruder or a granulator;
step four, drying and roasting: and naturally airing the obtained sample for 24 hours at normal temperature in a dark place, roasting the sample in a high-temperature muffle furnace, keeping the roasting temperature at 550 ℃, keeping the temperature programming rate at 10 ℃/min, and keeping the roasting time at 5 hours, and then obtaining the adsorbent product with high mechanical strength and good adsorption effect on aromatic hydrocarbons such as toluene, xylene and the like.
Experiments show that under the same conditions, the method has obvious advantages compared with the traditional impregnation method and the traditional ion exchange method, and the adsorbent prepared by the method has obviously better effect than the traditional method. FIG. 1 is a graph showing the comparative adsorption curves of three samples at the same humidity (30% RH), at an upstream concentration of 300mg/m3, at a wind speed of 0.2m/s and at a residence time of 0.25s, for the example of toluene adsorption. As can be seen from FIG. 1, the adsorbent prepared by the method of this example has better toluene adsorption effect.
In addition, under the condition of high humidity, the adsorption effect of the sample prepared by the method is reduced slightly under the condition of lower humidity. Specifically, referring to FIG. 2, FIG. 2 is a graph illustrating the adsorption of toluene, and the method is used to prepare comparative adsorption curves of samples under two humidity conditions with an upstream concentration of 300mg/m3, a wind speed of 0.2m/s, and a residence time of 0.25 s. As can be seen from fig. 2, the adsorbents prepared by the method of the present embodiment have a little difference in adsorption effect between the 30% RH and the 70% RH.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the scope of the present invention in any way, and all technical solutions obtained by using equivalent substitution methods fall within the scope of the present invention.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (10)
1. The preparation method of the silver-containing supported adsorbent is characterized by comprising the following steps:
step one, selecting a molecular sieve with a high silicon-aluminum ratio as an adsorbent carrier;
step two, preparing silver nitrate solution: under the conditions of light protection and normal temperature, adding a certain amount of AgNO3 solid into water, stirring and dissolving to obtain AgNO3 solution with a certain concentration;
step three, forming and loading: mixing the selected molecular sieve with high silica-alumina ratio, pseudo-boehmite, hydroxypropyl methylcellulose and sesbania powder according to the weight ratio of 100: 20-30: 1-2: 2-5 to obtain mixed powder, adding the mixed powder into a kneader for kneading, simultaneously, uniformly dropwise adding the prepared AgNO3 solution into the mixed powder under the condition of keeping out of the sun to obtain a kneaded mixture, and then preparing the mixture into a sample with a shape;
step four, drying and roasting: and naturally drying the obtained sample at normal temperature in a dark place, and roasting at high temperature to obtain the silver-containing supported adsorbent product.
2. The method as claimed in claim 1, wherein in the first step, the molecular sieve with high silica-alumina ratio is Y molecular sieve, the molecular formula of Y molecular sieve is Na56[ Al56Si136O384 ]. 250H2O, and the silica-alumina ratio is 250-.
3. The method as claimed in claim 1, wherein in the first step, the molecular sieve with high silica-alumina ratio is beta molecular sieve, the molecular formula of the beta molecular sieve is | Na7| [ Al7Si57O128], and the silica-alumina ratio is 200-.
4. The method for preparing the silver-containing supported adsorbent of claim 1, wherein in the second step, the AgNO3 solid is added into water and stirred to be dissolved for 0.5-1h, and the concentration of the obtained AgNO3 solution is 0.1-0.25 mol/L.
5. The method as claimed in claim 4, wherein the AgNO3 solution has a concentration of 0.25 mol/L.
6. The method for preparing the silver-containing supported adsorbent according to claim 1, wherein in the third step, the selected molecular sieve with high silica-alumina ratio, pseudo-boehmite, hydroxypropyl methylcellulose and sesbania powder are mixed according to a ratio of 100: 20: 1: 3, and fully mixing the components in a mass ratio to obtain mixed powder.
7. The method for preparing the silver-containing supported adsorbent according to claim 1, wherein in the third step, the mixed powder is kneaded in a kneader for 2-4h, and the mass ratio of the mixed powder to the AgNO3 solution in the mixed powder is 2.5-3.
8. The method for preparing the silver-containing supported adsorbent according to claim 7, wherein the mass ratio of the mixed powder to the AgNO3 solution in the mixed material is 3.
9. The method of claim 1, wherein in step three, the mixture is processed into a strip-shaped or spherical sample by a screw extruder or a pelletizer.
10. The method for preparing the silver-containing supported adsorbent according to claim 1, wherein in the fourth step, the sample is naturally dried for 24h to 48h under normal temperature and dark conditions, and the sample is baked in a muffle furnace at a temperature of 500 ℃ and 600 ℃, the programmed temperature rise rate is 8 to 10 ℃/min, and the baking time is 4 to 5 h.
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| CN114618431A (en) * | 2020-12-14 | 2022-06-14 | 中国科学院大连化学物理研究所 | Efficient adsorption material and preparation method thereof |
-
2022
- 2022-06-23 CN CN202210714959.6A patent/CN115069210A/en active Pending
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| CN101862671A (en) * | 2009-04-16 | 2010-10-20 | 北京服装学院 | Introducing method of active components formed and processed by beta molecular sieve based catalyst |
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Application publication date: 20220920 |