◼PRODUCT DESCRIPTION

GR-03Acatalystisahydrogensulfideselectiveoxidationcatalystwithlargeporesizeand low specific surface area sio2as carrier and iron as active components. The catalyst has the characteristics of high total sulfur conversion rate, high selectivity and good activity stability. Its comprehensive performance and technical indicators have reached the international advanced level.

GR-03A catalyst is composed of GR-03A and GR-03B mixed in a volume ratio of4:1and then used in combi notion. GR-03A is a highly active hydrogen sulfide selective oxidation catalyst, and GR-03B is a termination oxidation reaction catalyst to prevent over- oxidation and improve oxidation selectivity.

(1)Hydrogensulfideselectiveoxidationreaction:H2s+0.502=s+H20 (2)Traceover-oxidationreaction:s+02=s02H2s+1.502=so2+H20.

(2)During the production process, as the reaction temperature increases, the hydrogen sulfide oxidation conversion rate increases, but the selectivity of generating elemental sulfur will gradually

decrease.

(3)The catalyst has the structural characteristics of large pore size and low specific surface area, which completely eliminates the diffusion restriction of process gas inside the catalyst and improves the selectivity of the catalyst.

(4)The catalyst has high total sulfur conversion rate and high selectivity.

◼What are the respective functions of the GR-03A and GR-03B components in the GR-03A catalyst? Why is the ratio of GR-03A to GR-03B a 4:1 mixture?

GR-03A is the main catalyst, its core function being to catalyze the highly active selective oxidation of H₂S to elemental sulfur. GR-03B is the co-catalyst, its core function being to suppress side reactions and prevent the generated sulfur from being excessively oxidized to SO₂, thereby significantly improving the selectivity of the reaction. The 4:1 volume ratio is the optimal ratio determined through optimization experiments, which achieves the highest sulfur selectivity while maintaining high activity.

◼What are the advantages of the catalyst's "large pore size and low specific surface area" characteristics?

These characteristics are crucial. The large pore size provides channels for rapid diffusion of reactants and products (especially the generated liquid sulfur), avoiding pore clogging and internal diffusion limitations. The low specific surface area reduces active sites for deep oxidation, physically suppressing the side reaction of further oxidation of sulfur to SO₂, thereby fundamentally improving selectivity.

◼How is the reaction temperature controlled to avoid a decrease in selectivity?

The oxidation of hydrogen sulfide is an exothermic reaction, and the reactor bed temperature must be strictly controlled. The bed temperature is typically maintained within the optimal window (usually within a certain range below the sulfur dew point) by adjusting the H₂S concentration and oxygen-sulfur ratio in the feed gas, as well as by employing multi-stage reactions and intercooling. Excessively high temperatures significantly increase SO₂ formation, resulting in a decrease in selectivity.

◼What are the main process applications for this catalyst?

It is primarily used in the tail gas treatment unit of a Claus unit to directly oxidize the remaining H₂S in the tail gas to sulfur. It can also be used in direct selective desulfurization processes for gases such as natural gas, refinery gas, and coal gasification gas, converting H₂S into sulfur for recovery in the presence of oxygen.

◼How does a selective oxidation catalyst differ from a traditional Claus catalyst?

Traditional Claus catalysts (such as alumina) catalyze the reaction of H₂S and SO₂ (2H₂S + SO₂ → 3S + 2H₂O), requiring a strictly controlled SO₂/H₂S ratio of 1:2. Selective oxidation catalysts (such as GR-03A), on the other hand, directly oxidize H₂S to elemental sulfur in the presence of oxygen (H₂S + ½O₂ → S + H₂O). This simpler process makes it particularly suitable for treating tail gas with low H₂S concentrations.

Shandong Weiyijia Co., Ltd. is a high-tech enterprise dedicated to the field of industrial catalytic purification. We specialize in the research, development, production, and sales of a wide range of high-performance catalysts and purifiers, providing key materials and technical support to the global petrochemical, coal chemical, gas purification, environmental protection, and new energy industries.

As a professional catalyst supplier, we deeply understand the core role of catalysts in downstream processes.

Leveraging years of experience in technology research and development and engineering applications, we have developed several mature product lines, including:

• Desulfurizer Series: Efficiently removes inorganic and organic sulfur from feed gases and liquids, protecting downstream equipment.

• Deoxidizer Series: Precisely removes trace oxygen from olefins (such as ethylene and propylene) to prevent catalyst poisoning.

• Dechlorinator Series: Removes chlorides from process materials, protecting equipment from corrosion.

• Customized Catalysts: We provide customized solutions tailored to our customers' specific process conditions and requirements.

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