Organic sulfur hydrogenation catalyst , with activated alumina as the carrier and iron and molybdenum as the active components, feature high hydrogenation desulfurization activity and good stability. This catalyst is suitable for the hydrogenation conversion of organic sulfur in coke oven gas, and also for the hydrogenation saturation of olefins contained in the gas to protect the normal use of various subsequent catalysts. S the product of mercaptan, thioether, thiophene, COS, CS ₂ has higher hydrogenation conversion rate.
The organic sulfur hydrogenation catalyst carrier has the following application characteristics in this field:
The basic functions of the carrier
- Active component loading platform:
It provides a high specific surface area (usually > 180 m²/g) and porous structure for metal active components (such as Co, Mo, Ni, etc.), enabling their uniform dispersion and the formation of highly efficient hydrogenation active centers (such as sulfurized CoMoS, NiMoS).
- Mechanical and thermal stability:
It can withstand high temperatures (300-450 ℃) and air flow erosion, with an anti-crushing strength of over 120 N per particle, preventing the catalyst from breaking and deactivating in a fixed bed or fluidized bed.
Performance optimization for hydrogenation of organic sulfur
- Hole structure adaptation:
Optimize the mesoporous (2-50 nm) ratio. For instance, if the pore size is concentrated at 10-20 nm and the pore volume is greater than 0.35 cm³/g, it will facilitate the diffusion of macromolecular organic sulfur (such as benzothiophene) to the active site and reduce mass transfer resistance.
Regulation of surface chemical properties:
By introducing a small amount of basic oxides (such as MgO, CaO) or rare earth elements (La, Ce), the acidity and alkalinity of the carrier surface are adjusted to enhance the adsorption capacity for organic sulfur molecules and promote the cleavage of C-S bonds.
Modification directions of activated alumina carriers
- Enhanced anti-poisoning ability:
Some feedstock gases contain trace amounts of metals (such as Fe and Na) or carbon deposit precursors. After the surface of the carrier is modified with silicon (Si) or phosphorus (P), the deposition of impurities can be reduced and the service life of the catalyst can be prolonged.
- Low-temperature activity enhancement:
Through the preparation technology of nano-scale activated alumina (such as sol-gel method), the vulcanization temperature of the active components is reduced to achieve efficient organic sulfur hydrogenation at a low temperature of 200-250 ℃, which is suitable for light raw materials such as natural gas and naphtha.
Technical Index
Product: The organic sulfur hydrogenation catalyst carrier
Chemical Formula : AI2O3
CAS: 1344-28- 1
|
Item analysis |
Unit |
Technical Parameters |
|
Al2O3 |
% |
≥93 |
|
SiO2 |
% |
≤0.10 |
|
Fe2O3 |
% |
≤0.04 |
|
Na2O |
% |
≤0.45 |
|
Surface area |
m2/g |
≥200 |
|
Pore volume |
ml/g |
≥0.40 |
|
Loose density |
g/ml |
≤0.60 |
|
Crushing strength |
N/Granule |
≥50(3-5mm) |
The Organic Sulfur Hydrogenation Catalyst Carrier Typical Application Scenarios
Natural gas desulfurization
Organic sulfur (such as methyl mercaptan and ethyl sulfide) in natural gas needs to be removed to less than 0.1 ppm. Under the conditions of 300-350℃ and H₂/ feedstock gas =50-100, the Co-Mo catalyst supported by activated alumina can hydrogenate the organic sulfur into H₂S, and then remove it through adsorption by zinc oxide.
Pretreatment of petroleum refining
The thiophene organic sulfur in naphtha and diesel (with a content of up to 1000 ppm or more) needs to be hydrogenated and converted in the hydrogenation refining unit through the Ni-Mo catalyst supported by activated alumina at 350-400 ℃ and high pressure (3-5 MPa) to meet the low-sulfur fuel oil standard (such as diesel sulfur content < 10 ppm).
Desulfurization of synthetic gas in coal chemical industry
The coal-to-synthesis gas contains organic sulfur such as COS and CS₂. First, it is hydrogenated through an activated alumina carrier catalyst to generate H₂S, and then removed by the alkanolamine method or dry method to avoid poisoning of subsequent catalysts (such as methanol synthesis catalysts).
The Organic Sulfur Hydrogenation Catalyst Carrier Comparison With Other Carriers
Superior to silicone carriers
Activated alumina has a strong resistance to water vaporization and is not prone to pulverization in high-humidity environments, making it more suitable for the treatment of raw gas containing water vapor.
The cost is lower than that of silicon carbide carriers
It has a higher cost performance in medium and low pressure hydrogenation scenarios, and the surface hydroxyl groups can form stronger interactions with the active components, enhancing the stability of the sulfurized active phase.
Summary
Activated alumina, as a carrier of organic sulfur hydrogenation catalysts, achieves efficient organic sulfur conversion in natural gas, petroleum and coal chemical desulfurization through pore structure design, surface modification and the synergistic effect of active components. Its core advantages lie in:
Adapt to the diffusion of organic sulfur with different molecular sizes
The low-temperature activity and anti-toxicity can be optimized through modification.
With mature technology and controllable cost, it is the mainstream carrier material in the current industrial desulfurization field.
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