Zinc oxide desulfurization catalyst is made of zinc oxide with active additives, and is mainly used in the purification process of industrial raw gas (oil) such as hydrogen production, ammonia synthesis, methanol synthesis, and organic chemical products. In this article, we will introduce the principle of zinc oxide desulfurization agent and its application in the industrial field.
Importance of Zinc Oxide Desulphurization Catalysts
Zinc oxide (ZnO) desulphurization catalysts are vital in the industrial sector, not only to effectively reduce sulphide emissions and negative impacts on the environment and human health, but also to meet the requirements of increasingly stringent environmental regulations, while protecting industrial catalysts from toxicity and improving production efficiency. Through continuous technological innovation, zinc oxide desulphurization catalysts are expanding their applications in the coal gasification, petrochemical, power and steel industries, demonstrating their indispensable role in cleaner production and environmental management in modern industry.
Principle of zinc oxide desulfurization
Zinc oxide is a kind of conversion absorption desulfurization agent, and sulfur has a strong affinity, the product of zinc sulfide has a high stability, it can remove hydrogen sulfide and part of the organic sulfide in the gas. The reaction performance with mercaptan is better in the desulfurization of organic sulfides. Its reaction formula is as follows:
ZnO + H2S = ZnS + H2O
ZnO + C2H5SH = ZnS + C2H5OH
ZnO + H2S = ZnS + C2H4 + H2O
When hydrogen is present in the gas, carbonyl sulfide, carbon disulfide, mercaptans, and thioethers will undergo a conversion reaction at the reaction temperature, and the hydrogen sulfide generated by the reaction is absorbed by zinc oxide. The organic sulfur conversion rate has a certain proportional relationship with the reaction temperature. The ability of thiophene sulfides and their derivatives to undergo conversion reactions with hydrogen on zinc oxide is very low. Therefore, thiophene sulfides cannot be removed by zinc oxide alone, and can only be removed by zinc oxide desulfurizer with the aid of hydrogenation over a cobalt-molybdenum catalyst to hydrogen sulfide.
Role of zinc oxide desulfurizer
This agent can not only remove the sulfur in the raw gas (oil) to 0.5ppm to 0.05ppm or less, which ensures that the catalysts containing nickel, copper, iron and precious metals in the subsequent processes such as steam reforming, low conversion, methanation, methanol, low carbon alcohols, carbonyl synthesis and so on, are free from sulfur poisoning. It also has strong conversion and absorption capacity for simple organic sulfides such as H2S and CS2 in raw gas (oil).
Application of zinc oxide desulfurizer
Because zinc oxide desulfurizer has high desulfurization precision, easy to use, stable and reliable, high sulfur capacity, so in the desulfurization process plays a "gatekeeper" and "protection" role and occupies a very important position. It is widely used in ammonia, ammonia production, coal chemical industry, petroleum refining, beverage production and other industries to remove hydrogen sulfide and some organic sulfur from natural gas, petroleum distillates, oilfield gas, refinery gas, synthesis gas (CO + H2), carbon dioxide and other raw materials.