Ammonia Decomposition Catalyst

Performance characteristics:Ammonia decomposition catalyst has a smooth shape, easy to fill, avoid bridging, uniform airflow distribution,excellent heat transfer and mass transfer performance, strong low carbon resistance. 

H2O:C The lower limit of the experimental value is 2.0. The actual low limit of long-term operation It is 2.70,and the short-term reaches 2.40. The bed resistance is uniform and stable. Under normal operating conditions, the bed resistance will hardly rise during use. Excellent low temperature activity, the lowest inlet temperature in actual operation can reach 400 ℃. Excellent anti-mildew performance.

Ammonia decomposition is a reversible reaction under the action of ammonia decomposition catalyst. Nickel-based catalyst containing more than 14% nickel is generally used. This reaction is an endothermic reaction, and the ideal temperature is 800-860 °C. At the same time, it is a reaction that the gas volume increases. The gas volume increases by about 2 times before and after the reaction, so the pressure of the reaction should not be too high, generally about 0.05MPa. If the pressure is too high, it is not conducive to the decomposition of ammonia.And it will also reduce the life of the ammonia decomposition catalyst.

This reaction is carried out gradually with the increase of the temperature of ammonia in the decomposition furnace. The table shows the composition of the gas mixture at different temperatures when ammonia is decomposed. It can be seen from this that ammonia decomposes slowly from 270 °C, while The decomposition is basically completed when it reaches 625 °C, so the decomposition temperature is generally controlled above 800 °C. The volume ratio of the final product is H275%, N225%.

In order to save energy consumption, the ammonia gas is preheated before entering the decomposition furnace, and the casing heat exchanger is used to appropriately increase the temperature of the ammonia gas with the decomposed high temperature gas, and at the same time, the ammonia decomposition gas can be properly cooled.

After the ammonia gas enters the furnace, it first enters into the serpentine pipes near the electric heating element around the furnace to be fully heated, and the temperature rises to above 600 °C, and then enters the central furnace with catalyst. The temperature in the furnace is basically 800-850 °C , where the gas flow rate decreases, and the gas is fully contacted with the catalyst, so that the decomposition reaction occurs under the catalytic action to generate ammonia decomposition gas.

After ammonia decomposition, there is still residual ammonia ≤500ppm (1ppm=10-3mL/L), the dew point is <-10℃, and the oxygen content is ≤5ppm. The protective gas with residual ammonia is introduced into 

Technical Index of Ammonia Decomposition Catalyst:

Operating Condition of Ammonia Decomposition Catalyst: