EH-5 hydrolysis catalyst is a deep COS hydrolysis catalyst developed and improved by Hubei Chemical Research Institute based on T504 hydrolysis catalyst, EH-2 and EH-3 medium temperature sulfur resistant hydrolysis catalysts, and EH-4 propylene specific COS hydrolysis catalyst. It is mainly used for COS hydrolysis in large methanol plants (or coal to oil plants) to reduce COS to less than 5ppb. It is used in conjunction with HTS-1 or HTS-2 deep purification and fine desulfurizer to reduce the total sulfur (COS+H₂S) content in the exported purified gas to less than 10ppb (0.01ppm), achieving deep purification and extending the service life of methanol catalyst to 5-6 years. This enables the replacement of methanol catalyst only once every two major maintenance cycles, resulting in greater economic benefits for the enterprise.

Performance Characteristics
1. Good catalytic activity, high COS removal purification degree, and outlet COS content<5ppb (0.005ppm).
2. It can be used at high airspeed of up to 8000-12000h-1.
3. It can be used in a wide temperature range of 30-150 ℃.

Two reaction principle
Under the action of EH-5 hydrolysis catalyst, COS reacts with trace water in synthesis gas to produce CO₂and H₂S. Then, HTS-1 or HTS-2 deep purification desulfurizer is used to remove the generated H₂S, achieving the goal of deep purification (COS+H₂S<10ppb). The reaction equation is:
COS＋H₂O====H₂S＋CO₂      Δ H=－35.5KJ/mol

Three main physical and chemical properties and quality indicators
Table 1 Main Physical and Chemical Properties of EH-5 Hydrolysis Catalyst

Table 2 Main Quality Indicators of EH-5 Hydrolysis Catalyst

Five normal operation and usage conditions
1. Airspeed: 8000-12000h-1
2. Temperature: Room temperature~150 ℃
3. Pressure: Normal pressure~15.0Mpa
4. Used in conjunction with processes such as low-temperature methanol washing