CN112427007A - Preparation method of activated alumina ball adsorbent - Google Patents
Preparation method of activated alumina ball adsorbent Download PDFInfo
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- CN112427007A CN112427007A CN202011295800.2A CN202011295800A CN112427007A CN 112427007 A CN112427007 A CN 112427007A CN 202011295800 A CN202011295800 A CN 202011295800A CN 112427007 A CN112427007 A CN 112427007A
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 52
- 239000003463 adsorbent Substances 0.000 title claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 46
- 238000001354 calcination Methods 0.000 claims abstract description 28
- 230000005484 gravity Effects 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 30
- 229910052782 aluminium Inorganic materials 0.000 claims description 30
- 239000000243 solution Substances 0.000 claims description 29
- 230000002378 acidificating effect Effects 0.000 claims description 20
- 239000007864 aqueous solution Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 14
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 12
- 229910017604 nitric acid Inorganic materials 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 229920002678 cellulose Polymers 0.000 claims description 10
- 239000001913 cellulose Substances 0.000 claims description 10
- 229910001648 diaspore Inorganic materials 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 239000004793 Polystyrene Substances 0.000 claims description 8
- 229920002223 polystyrene Polymers 0.000 claims description 8
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 7
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 7
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000002390 rotary evaporation Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract description 6
- 238000010669 acid-base reaction Methods 0.000 abstract description 3
- 239000012752 auxiliary agent Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract 2
- 229910021529 ammonia Inorganic materials 0.000 abstract 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 2
- 229920000193 polymethacrylate Polymers 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- 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
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
-
- 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
- B01J20/28014—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 form
- B01J20/28016—Particle form
- B01J20/28019—Spherical, ellipsoidal or cylindrical
Abstract
The invention discloses a preparation method of an active alumina ball adsorbent, which comprises the following steps: p1, batching; p2, preparing sol; p3, preparing spheres; p4, obtaining a sphere; p5, calcination: and (3) inputting the alumina gel sphere into a calcining furnace, and calcining at 900-1100 ℃ to complete the preparation of the alumina sphere adsorbent. Mix through multi-purpose auxiliary agent and raw materials, make mixed raw materials in advance, then prepare the sol, improve the raw materials activity, then utilize gravity dropwise add to the ammonia, can form the spheroid structure naturally, need not high temperature heating, guarantee the homogeneity of spheroid structure, do benefit to control processing, reduce cost effectively improves the inside and surperficial pore quality of spheroid simultaneously through the acid-base reaction in different stages, guarantees product quality, and convenient production is prepared, does benefit to and uses widely.
Description
Technical Field
The invention relates to the technical field of alumina balls, in particular to a preparation method of an active alumina ball adsorbent.
Background
In the current daily life and industrial production, because the alumina has the characteristics of large specific surface area, controllable pore structure, good thermal stability, strong adsorption capacity and the like, the alumina is widely used as a catalyst, a catalyst carrier, an adsorbent and the like, and the spherical alumina adsorbent is most widely applied and has larger demand.
However, in the process of preparing the alumina ball adsorbent, a single alumina material is mostly directly adopted to be manufactured by a melt-blowing method, so that not only is the spherical structure not favorably formed, but also the inside of the alumina material is unfavorable for forming pores, or the pores are smaller, so that the product quality is influenced, meanwhile, the process flow is assisted, the control operation is not favorably carried out, and a new preparation method needs to be provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a preparation method of an active alumina ball adsorbent.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of an activated alumina ball adsorbent comprises the following steps:
p1, ingredients: preparing an aluminum ball raw material, an acidic aqueous solution and a preparation solution according to the process requirements for later use;
p2, preparation of sol: adding the aluminum ball raw material into an acidic aqueous solution, uniformly stirring for 50-70 minutes, and carrying out a continuous reaction to obtain sol;
p3, preparation of spheres: adding the solution into a container, dropping the sol into the prepared solution under the action of gravity, and dispersing to form spheres to obtain a sphere mixed liquid;
p4, obtaining sphere: filtering the sphere mixed liquid, taking out the sphere, and putting the sphere into a rotary evaporator for rotary evaporation to obtain an alumina gel sphere;
p5, calcination: and (3) inputting the alumina gel sphere into a calcining furnace, and calcining at 900-1100 ℃ to complete the preparation of the alumina sphere adsorbent.
Preferably, the aluminum ball raw material in the step P1 comprises 65-80% of aluminum oxide, 2-5% of diaspore, 5-8% of nitric acid adhesive, 3-6% of cellulose forming agent and 6-10% of polystyrene template.
Preferably, the preparation method of the aluminum ball raw material comprises the following steps:
a1, weighing the raw materials according to the mass percentage for later use;
a2, adding alumina, diaspore and polystyrene template into a mixer, and uniformly stirring for 30 to 50 minutes to obtain a first mixed material;
a3, adding a nitric acid binder into the first mixed material, and uniformly mixing to form a second mixed material:
a4, putting the second mixture into a pressing machine, laying a cellulose forming agent, and then pressing to form a bar stock;
and A5, cutting the bar stock into blocks to finish the preparation of the aluminum ball raw material.
Preferably, the acidic aqueous solution of the P1 step includes one of an aqueous nitric acid solution with a concentration of 8% and an aqueous hydrochloric acid solution with a concentration of 12%.
Preferably, the preparation solution of the P1 step is 12% -18% ammonia solution.
Preferably, the weight ratio of the aluminum ball raw material in the P2 step to the acidic aqueous solution is 1: 3.2-3.6.
Preferably, the P3 step further comprises vacuumizing the sol, wherein the vacuum degree is-0.05 MPa to-0.02 MPa, and the duration is 15 minutes to 20 minutes.
Preferably, the rotating drying speed of the step P4 is 120 to 150 revolutions per minute, the temperature is 80 to 90 degrees celsius, and the duration is 2 to 3 hours.
Preferably, the calcination temperature rise mode of the step P5 is to heat up to 500 to 550 ℃ at 30 to 40 ℃ per minute, preserve heat for 5 minutes, then heat up to 900 to 1100 ℃ at 50 to 70 ℃ per minute, calcine for 2 to 3 hours, and then naturally cool.
According to the preparation method of the active alumina ball adsorbent, provided by the invention, the multi-purpose auxiliary agent and the raw materials are mixed to prepare the mixed raw materials in advance, then the sol is prepared to improve the activity of the raw materials, then the mixed raw materials are dripped into the ammonia water by utilizing gravity, a spherical structure can be naturally formed, high-temperature heating is not needed, the uniformity of the spherical structure is ensured, the control processing is facilitated, the cost is reduced, meanwhile, the pore quality of the inner part and the surface of the sphere is effectively improved through acid-base reactions in different stages, the product quality is ensured, the production and the preparation are convenient, and the popularization and the.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A preparation method of an activated alumina ball adsorbent comprises the following steps:
p1, ingredients: preparing an aluminum ball raw material, an acidic aqueous solution and a preparation solution according to the process requirements for later use;
p2, preparation of sol: adding the aluminum ball raw material into an acidic aqueous solution, uniformly stirring for 50-70 minutes, and carrying out a continuous reaction to obtain sol;
p3, preparation of spheres: adding the solution into a container, dropping the sol into the prepared solution under the action of gravity, and dispersing to form spheres to obtain a sphere mixed liquid;
p4, obtaining sphere: filtering the sphere mixed liquid, taking out the sphere, and putting the sphere into a rotary evaporator for rotary evaporation to obtain an alumina gel sphere;
p5, calcination: and (3) inputting the alumina gel sphere into a calcining furnace, and calcining at 900-1100 ℃ to complete the preparation of the alumina sphere adsorbent.
Preferably, the aluminum ball raw material in the step P1 comprises 65-80% of alumina, 2-5% of diaspore, 5-8% of nitric acid adhesive, 3-6% of cellulose forming agent and 6-10% of polystyrene template.
Preferably, the preparation method of the aluminum ball raw material comprises the following steps:
a1, weighing the raw materials according to the mass percentage for later use;
a2, adding alumina, diaspore and polystyrene template into a mixer, and uniformly stirring for 30 to 50 minutes to obtain a first mixed material;
a3, adding a nitric acid binder into the first mixed material, and uniformly mixing to form a second mixed material:
a4, putting the second mixture into a pressing machine, laying a cellulose forming agent, and then pressing to form a bar stock;
and A5, cutting the bar stock into blocks to finish the preparation of the aluminum ball raw material.
Preferably, the acidic aqueous solution of the P1 step includes one of an aqueous nitric acid solution of 8% concentration and an aqueous hydrochloric acid solution of 12% concentration.
Preferably, the preparation solution of the P1 step is 12-18% ammonia solution.
Preferably, the weight ratio of the aluminum ball raw material and the acidic aqueous solution in the step P2 is 1: 3.2-3.6.
Preferably, the P3 step further comprises evacuating the sol under a vacuum of-0.05 MPa to-0.02 MPa for a duration of 15 minutes to 20 minutes.
Preferably, the rotating drying speed of the P4 step is 120 to 150 revolutions per minute, the temperature is 80 to 90 degrees celsius, and the duration is 2 to 3 hours.
Preferably, the calcination temperature rise mode of the step P5 is to heat the mixture to 500 to 550 ℃ at 30 to 40 ℃ per minute, preserve the heat for 5 minutes, then heat the mixture to 900 to 1100 ℃ at 50 to 70 ℃ per minute, perform calcination for 2 to 3 hours, and then naturally cool the mixture.
According to the preparation method of the active alumina ball adsorbent, provided by the invention, the multi-purpose auxiliary agent and the raw materials are mixed to prepare the mixed raw materials in advance, then the sol is prepared to improve the activity of the raw materials, then the mixed raw materials are dripped into the ammonia water by utilizing gravity, a spherical structure can be naturally formed, high-temperature heating is not needed, the uniformity of the spherical structure is ensured, the control processing is facilitated, the cost is reduced, meanwhile, the pore quality of the inner part and the surface of the sphere is effectively improved through acid-base reactions in different stages, the product quality is ensured, the production and the preparation are convenient, and the popularization and the.
Example 1
A preparation method of an activated alumina ball adsorbent comprises the following steps:
p1, ingredients: preparing an aluminum ball raw material, an acidic aqueous solution and a preparation solution according to the process requirements for later use;
p2, preparation of sol: adding the aluminum ball raw material into an acidic aqueous solution, uniformly stirring for 50-70 minutes, and carrying out a continuous reaction to obtain sol;
p3, preparation of spheres: adding the solution into a container, dropping the sol into the prepared solution under the action of gravity, and dispersing to form spheres to obtain a sphere mixed liquid;
p4, obtaining sphere: filtering the sphere mixed liquid, taking out the sphere, and putting the sphere into a rotary evaporator for rotary evaporation to obtain an alumina gel sphere;
p5, calcination: and (3) inputting the alumina gel sphere into a calcining furnace, and calcining at 900-1100 ℃ to complete the preparation of the alumina sphere adsorbent.
Preferably, the raw material of the aluminum balls in the step P1 comprises 80% of alumina, 5% of diaspore, 5% of nitric acid adhesive, 3% of cellulose forming agent and 7% of polystyrene template agent.
Preferably, the preparation method of the aluminum ball raw material comprises the following steps:
a1, weighing the raw materials according to the mass percentage for later use;
a2, adding alumina, diaspore and polystyrene template into a mixer, and uniformly stirring for 30 to 50 minutes to obtain a first mixed material;
a3, adding a nitric acid binder into the first mixed material, and uniformly mixing to form a second mixed material:
a4, putting the second mixture into a pressing machine, laying a cellulose forming agent, and then pressing to form a bar stock;
and A5, cutting the bar stock into blocks to finish the preparation of the aluminum ball raw material.
Preferably, the acidic aqueous solution of step P1 comprises an 8% strength aqueous nitric acid solution.
Preferably, the preparation solution in the step P1 is a 15% strength ammonia solution.
Preferably, the weight ratio of the aluminum ball raw material and the acidic aqueous solution in the step P2 is 1: 3.5.
Preferably, the P3 step further comprises evacuating the sol under a vacuum of-0.05 MPa to-0.02 MPa for a duration of 15 minutes to 20 minutes.
Preferably, the rotating drying speed of the P4 step is 120 to 150 revolutions per minute, the temperature is 80 to 90 degrees celsius, and the duration is 2 to 3 hours.
Preferably, the calcination temperature rise mode of the step P5 is to heat the mixture to 500 to 550 ℃ at 30 to 40 ℃ per minute, preserve the heat for 5 minutes, then heat the mixture to 900 to 1100 ℃ at 50 to 70 ℃ per minute, perform calcination for 2 to 3 hours, and then naturally cool the mixture.
Example 2
A preparation method of an activated alumina ball adsorbent comprises the following steps:
p1, ingredients: preparing an aluminum ball raw material, an acidic aqueous solution and a preparation solution according to the process requirements for later use;
p2, preparation of sol: adding the aluminum ball raw material into an acidic aqueous solution, uniformly stirring for 50-70 minutes, and carrying out a continuous reaction to obtain sol;
p3, preparation of spheres: adding the solution into a container, dropping the sol into the prepared solution under the action of gravity, and dispersing to form spheres to obtain a sphere mixed liquid;
p4, obtaining sphere: filtering the sphere mixed liquid, taking out the sphere, and putting the sphere into a rotary evaporator for rotary evaporation to obtain an alumina gel sphere;
p5, calcination: and (3) inputting the alumina gel sphere into a calcining furnace, and calcining at 900-1100 ℃ to complete the preparation of the alumina sphere adsorbent.
Preferably, the raw material of the aluminum ball in the step P1 comprises 72% of alumina, 4% of diaspore, 8% of acetic acid adhesive, 6% of cellulose forming agent and 10% of polymethacrylate template.
Preferably, the preparation method of the aluminum ball raw material comprises the following steps:
a1, weighing the raw materials according to the mass percentage for later use;
a2, adding alumina, diaspore and polymethacrylate template into a mixer, and uniformly stirring for 30 to 50 minutes to obtain a first mixed material;
a3, adding an acetic acid binder into the first mixed material, and uniformly mixing to form a second mixed material:
a4, putting the second mixture into a pressing machine, laying a cellulose forming agent, and then pressing to form a bar stock;
and A5, cutting the bar stock into blocks to finish the preparation of the aluminum ball raw material.
Preferably, the acidic aqueous solution of step P1 comprises a 12% strength aqueous hydrochloric acid solution.
Preferably, the preparation solution in the step P1 is a 12% strength ammonia solution.
Preferably, the weight ratio of the aluminum ball raw material and the acidic aqueous solution in the step P2 is 1: 3.2.
Preferably, the P3 step further comprises evacuating the sol under a vacuum of-0.05 MPa to-0.02 MPa for a duration of 15 minutes to 20 minutes.
Preferably, the rotating drying speed of the P4 step is 120 to 150 revolutions per minute, the temperature is 80 to 90 degrees celsius, and the duration is 2 to 3 hours.
Preferably, the calcination temperature rise mode of the step P5 is to heat the mixture to 500 to 550 ℃ at 30 to 40 ℃ per minute, preserve the heat for 5 minutes, then heat the mixture to 900 to 1100 ℃ at 50 to 70 ℃ per minute, perform calcination for 2 to 3 hours, and then naturally cool the mixture.
Claims (9)
1. A preparation method of an activated alumina ball adsorbent is characterized by comprising the following steps: the preparation method comprises the following steps:
p1, ingredients: preparing an aluminum ball raw material, an acidic aqueous solution and a preparation solution according to the process requirements for later use;
p2, preparation of sol: adding the aluminum ball raw material into an acidic aqueous solution, uniformly stirring for 50-70 minutes, and carrying out a continuous reaction to obtain sol;
p3, preparation of spheres: adding the solution into a container, dropping the sol into the prepared solution under the action of gravity, and dispersing to form spheres to obtain a sphere mixed liquid;
p4, obtaining sphere: filtering the sphere mixed liquid, taking out the sphere, and putting the sphere into a rotary evaporator for rotary evaporation to obtain an alumina gel sphere;
p5, calcination: and (3) inputting the alumina gel sphere into a calcining furnace, and calcining at 900-1100 ℃ to complete the preparation of the alumina sphere adsorbent.
2. The method for preparing an activated alumina ball adsorbent according to claim 1, wherein: the aluminum ball raw material of the step P1 comprises 65-80% of aluminum oxide, 2-5% of diaspore, 5-8% of nitric acid adhesive, 3-6% of cellulose forming agent and 6-10% of polystyrene template.
3. The method for preparing an activated alumina ball adsorbent according to claim 2, characterized in that: the preparation method of the aluminum ball raw material comprises the following steps:
a1, weighing the raw materials according to the mass percentage for later use;
a2, adding alumina, diaspore and polystyrene template into a mixer, and uniformly stirring for 30 to 50 minutes to obtain a first mixed material;
a3, adding a nitric acid binder into the first mixed material, and uniformly mixing to form a second mixed material:
a4, putting the second mixture into a pressing machine, laying a cellulose forming agent, and then pressing to form a bar stock;
and A5, cutting the bar stock into blocks to finish the preparation of the aluminum ball raw material.
4. The method for preparing an activated alumina ball adsorbent according to claim 1, wherein: the acidic aqueous solution of the P1 step includes one of an aqueous nitric acid solution of 8% concentration and an aqueous hydrochloric acid solution of 12% concentration.
5. The method for preparing an activated alumina ball adsorbent according to claim 1, wherein: the preparation solution in the step P1 is ammonia solution with the concentration of 12-18%.
6. The method for preparing an activated alumina ball adsorbent according to claim 1, wherein: the weight ratio of the aluminum ball raw material in the step P2 to the acidic aqueous solution is 1: 3.2-3.6.
7. The method for preparing an activated alumina ball adsorbent according to claim 1, wherein: and the step P3 also comprises the step of vacuumizing the sol, wherein the vacuum degree is between-0.05 and-0.02 MPa, and the duration is between 15 and 20 minutes.
8. The method for preparing an activated alumina ball adsorbent according to claim 1, wherein: and the rotating drying speed of the step P4 is 120 to 150 revolutions per minute, the temperature is 80 to 90 ℃, and the duration time is 2 to 3 hours.
9. The method for preparing an activated alumina ball adsorbent according to claim 1, wherein: the calcining temperature rise mode of the P5 step is that the temperature is raised to 500 to 550 ℃ at 30 to 40 ℃ per minute, the temperature is preserved for 5 minutes, then the temperature is raised to 900 to 1100 ℃ per minute at 50 to 70 ℃ for calcining for 2 to 3 hours, and then the calcining is naturally cooled.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116059985A (en) * | 2021-10-29 | 2023-05-05 | 中国石油化工股份有限公司 | Spherical alumina carrier and its synthesis process |
| CN116059985B (en) * | 2021-10-29 | 2024-05-07 | 中国石油化工股份有限公司 | Spherical alumina carrier and its synthesis process |
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