CO-MO System Sulfur-tolerant Shift Catalyst Carrier is generally produced by heating and dehydrating aluminium hydroxide, with the main component being γ-Al₂O₃, and it has a special skeleton structure. It is a white spherical porous particle with uniform micropore distribution, appropriate pore size and large pore volume. This structure makes its specific surface area large, which can provide a good loading basis for the active components.
CO-MO System Sulfur-tolerant Shift Catalyst Carrier have below characteristic:
Strong affinity
The special framework structure makes it have an extremely strong affinity with the active component, which can firmly load the active component, ensuring that the active component is not easy to fall off during the use of the catalyst and maintaining the stability of the catalyst's performance.
01
Good mechanical properties
This carrier has high mechanical strength, is not prone to breakage or powdering, and can withstand the pressure and impact during the reaction process. Under the complex working conditions of industrial production, it can maintain the integrity of particles for a long time, thereby extending the service life of the catalyst.
02
Excellent adsorption performance
It has a high water absorption rate and good adsorption performance, which can effectively adsorb certain substances in the reaction system, facilitate the reaction process, and to a certain extent, regulate the reaction environment.
03
High thermal stability
Activated alumina has excellent high-temperature resistance and chemical stability, and can be used under extreme conditions such as high temperatures. It can adapt to the temperature conditions required for sulfur-resistant displacement reactions in the CO-MO system and maintain structural and performance stability during the reaction process.
04
Technical Index
Product: CO-MO System Sulfur-tolerant Shift Catalyst Carrier
Chemical Formula : AI2O3
CAS No.: 1344-28- 1
|
Item analysis |
Unit |
Technical Parameters |
|
|
Al2O3 |
% |
≥93 |
≥93 |
|
SiO2 |
% |
≤0.10 |
≤0.10 |
|
Fe2O3 |
% |
≤0.04 |
≤0.04 |
|
Na2O |
% |
≤0.30 |
≤0.30 |
|
Surface area |
m2/g |
≥200 |
≥200 |
|
Pore volume |
ml/g |
≥0.40 |
≥0.40 |
|
Loose density |
g/ml |
≤0.50 |
≤0.50 |
|
Crushing strength |
N/Granule |
≥50(3-5mm) |
≥60 (4-6mm) |
Product Advantage
The Co-Mo-based sulfur-tolerant shift catalyst features excellent low-temperature activity, enabling the reaction to be initiated at a relatively low temperature and reducing energy consumption. Meanwhile, it has a wide operating temperature range, can maintain good catalytic activity within a relatively wide temperature range, adapt to different working conditions, and has a short vulcanization time, which can shorten the preparation and start-up time of the catalyst and improve production efficiency.
CO-MO System Sulfur-tolerant Shift Catalyst Carrier achieves efficient CO conversion in the treatment of sulfur-containing syngas through the co-design of structure-chemical properties. Its core value lies in:
A.Provide stable support for the vulcanized active components;
B.Adapt to high-sulfur environments through surface modification;
C.Optimizing the pore structure to enhance mass transfer and reaction efficiency is a key material for sulfur-resistant catalysis in the fields of coal chemical engineering and energy chemical engineering.
The specific applications are as follows:
The basic functions of the carrier
Structural support and specific surface area provision:
Activated alumina features a high specific surface area (typically > 200 m²/g) and a porous structure, providing sufficient loading surfaces for cobalt (Co) and molybdenum (Mo) active components, ensuring their uniform dispersion and preventing agglomeration and deactivation.
Mechanical strength guarantee:
In high-temperature (200-450 ℃), high-pressure and airflow erosion environments, the high strength of the activated alumina carrier (crushing strength > 150 N/ particle) can prevent the catalyst from breaking and maintain the stability of the bed layer.
Catalytic mechanism in sulfur-tolerant environments
The principle of the -CO sulfur-resistant shift reaction:
In the treatment of syngas (CO + H₂), CO and water vapor undergo a shift reaction under the action of a catalyst: CO + H₂O → CO₂ + H₂. However, sulfides such as H₂S in the feedstock gas are prone to poisoning traditional catalysts.
Sulfur resistance compatibility of activated alumina:
The cobalt-molybdenum active component is sulfur-resistant in the sulfurized state (e.g. MoS₂, Co₉S₈), and the chemical inertness of the activated alumina carrier (not reacting with H₂S) can maintain its sulfurized state stability.
The alkaline surface of the carrier (adjustable through modification) can adsorb a portion of H₂S, reducing the impact of direct contact of active sites with high-concentration sulfides and extending the catalyst's lifespan.
Carrier modification and performance optimization
Regulation of acidity and alkalinity:
By adding rare earth elements (such as La, Ce) or alkaline earth metals (such as Mg) to modify activated alumina, adjust its surface acidity and alkalinity, enhance its adsorption capacity for CO and H₂O, and promote the reaction rate.
Aperture and pore volume design:
In response to the gas diffusion requirements of sulfur-tolerant shift reactions, the pore size of the carrier (such as mesopores 2-50 nm) and pore volume (> 0.4 cm³/g) are optimized to reduce the diffusion resistance between reactants (CO, H₂O) and products (CO₂, H₂), and improve the mass transfer efficiency.
CO-MO System Sulfur-tolerant Shift Catalyst Carrier Practical application
Synthesis gas treatment in coal chemical industry
In processes such as coal-to-methanol and coal-to-hydrogen, sulfur-containing syngas is converted into H₂ through the Co sulfur-tolerant shift reaction while retaining H₂S (which can be desulfurized and recovered later). The Co-Mo catalyst supported by activated alumina can operate stably under the condition of H₂S concentration ranging from 500 to 5000 ppm.
Petroleum refining and shale gas Utilization:
The sulfur-containing syngas produced as a by-product of the oil refinery and the crude syngas converted from shale gas can both achieve CO conversion and H₂ purification through this catalyst system, meeting the requirements for raw gas in subsequent chemical production.
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