Study Of The Ability Of Anti-poisoning And The Mechanism Of Poisoning About Iron Catalysts For Ammonia Synthesis

Ammonia is one of the most basic chemical raw materials in the world. Industrially, the production of nitrogenous fertilizer and the synthesis of organonitrogen compounds fundamentally depend on their nitrogen source on NH3 produced by Haber-Bosch process. The FeO-based catalyst for ammonia synthesis was invented by professor Liuhuazhang in 1986, which has many advantages, such as high activity, easy reduce etc., but in the industry production process, the catalyst was sometimes poisoned by the impurity in the synthesis gas or by the operate missing. In order to complete the FeO ammonia catalyst's theory system and afford the method which the industry process needed, we have systematic studied the A301 ammonia synthesis catalyst's ability of anti-poisoning and regeneration under the high temperature and the high press condition with "impulse poisoning technique". We compared the ability of anti-poisoning and regeneration between A301 and A110 and got some conclusions(1) We study the reversible poisoning process about the FeO based on ammonia synthesis catalyst, compared with the Fe₃O₄ based on ammonia synthesize catalyst. Then we get that under the same condition, in the poisoning process, the FeO based on ammonia catalyst which catalyst activity is much more sensitive than the poison, but the regeneration process is faster and the result is more satisfied. This difference mainly caused by the physical structure and chemical compose.(2) This paper fully investigates the difference of FeO's function of anti-poison at the first time. It is founded that the catalyst is much more sensitive to poison at the highest temperature of the activated, while the higher temperature, the shorter the regeneration process is. Higher CO₂ concentration also results in worse catalyst...