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With increasingly stringent environmental regulations, natural gas, as a clean and efficient energy source, is playing an ever more important role in the energy system； As a renewable energy source, biogas also shows great potential in the recycling of waste materials and the provision of distributed energy supply. However, both during natural gas extraction and in the biogas production process, there is a tricky issue to deal with – the presence of hydrogen sulfide. Hydrogen sulfide (H2S) is not only corrosive and can damage equipment, but it is also highly toxic, posing a serious threat to human safety and environmental health. Thus, the desulfurization industry came into being, becoming a key element in ensuring energy security and a clean supply of energy. The liquid chelated iron desulfurization catalyst developed by Lvyuan Environmental Protection offers efficient, stable, and easy-to-operate performance, providing support for the treatment of industrial waste gases. The complexed iron desulfurization catalyst uses a liquid formulation, making it easy to add; no need to discharge the original liquid when replacing it, which greatly reduces operational complexity. Its core technology relies on multi-component complexing agents and composite catalysts to efficiently remove hydrogen sulfide (H₂S) through the following reactions: Overall reaction: H₂S + 1/2O₂ → H₂O + S; Catalytic oxidation: HS⁻ + 2Fe³⁺ → 2Fe²⁺ + H⁺ + S; Regeneration cycle: O₂ + H₂O + 2Fe²⁺ → 2Fe³⁺ + 2OH⁻. This reaction process is not only environmentally friendly and efficient but also non-toxic and safe; the desulfurization agent does not precipitate in the presence of strong bases, offering excellent stability. In the complexed iron desulfurization catalyst, water-soluble polymer polymers are used as stabilizing components in the complexing agent system, enabling iron to exist stably in ionic form in alkaline solutions; this effectively reduces the consumption of iron ions due to the degradation of the complexing agents ； In the design and operation of desulfurization processes, control based on the iron ion concentration and redox potential of the desulfurization solution is fundamental. In a weakly alkaline solution, the redox potential of Fe3+(L) is moderate; during desulfurization, Fe3+(L) directly oxidizes HS-(L) into sulfur, with a fast rate of homogeneous reaction. This approach prevents direct contact between HS-(L) and oxygen during the regeneration process, resulting in high selectivity for sulfur production and an extremely low rate of formation of by-products. It overcomes the drawbacks of traditional desulfurization processes, such as low sulfur capacity, complex processes, high formation of by-products, and frequent discharge of desulfurization waste liquids. The hydrogen sulfide purification unit enables a sulfur recovery rate of over 99%. In the future, the company will continue to adhere to the principles of technological innovation and customer-focused service, providing more enterprises with green and sustainable environmental solutions to contribute to industrial management and ecological protection.