What are the advantages of ammonia synthesis pre-reduction catalysts?
Thread Content
In the forum, discussions have already taken place regarding the performance of the ammonia synthesis pre-reduction catalyst (Amomax—10 type). Its advantages include: good activity at low temperatures, fast reduction speed, decent thermal stability, an increase in the daily ammonia production volume, and a reduction in the consumption of turbine steam (the circulators used in large ammonia plants are centrifuges). The first three advantages are understandable, but \"increasing the daily ammonia production and reducing turbine steam consumption\" is a bit confusing. If that is the case, can this catalyst increase the net ammonia value? Otherwise, how can the goals of increasing ammonia production and reducing turbine steam consumption be achieved? Please, fellow users, actively discuss this.
It is not necessarily better in terms of low-temperature activity compared to non-ammonia synthesis pre-reduction catalysts; it eliminates the need for reduction time in the plant. The reduction time required for the original catalysts is not necessarily shorter either, and it won’t have a significant impact on increasing daily production – after all, the daily output of ammonia does not depend on the catalyst. However, using an ammonia synthesis pre-reduction catalyst can save the initial startup time, allowing production to begin earlier, resulting in a higher output of products.
Our factory has never used it; it doesn’t seem to be as good as advertised. Its market potential isn’t very strong, and not many companies use it
Normal reduction takes about 5 days, while pre-reduction only requires around 2 days, thus saving a significant amount of time and increasing productivity. As for activity, it is generally believed that pre-reduced materials have undergone a passivation process, resulting in a slight decrease in activity ； But in reality, the reduction conditions and procedures may differ between catalyst manufacturers and end-users (the specifics are unclear), making it difficult to assess the effectiveness of the reduction. The A-10 catalyst may also contain Co; the formula has been improved, and it is said to have better activity, though its price might be slightly higher. Overall, pre-reduction catalysts have a certain market potential, as they do reduce the hassle for users.
If, as described in the information, it is possible to \"increase the daily ammonia production and reduce the consumption of turbine steam,\" then it must be due to an increased catalyst activity and a higher ammonia yield, as well as a reduced volume of gas circulating within the ammonia synthesis process. Only under these conditions, with the same ammonia tower or equivalent catalyst loading, can it be possible to \"increase the daily ammonia production and reduce the consumption of turbine steam.\" As described on the 2nd floor, is there a gap between what the documents state and the actual application results? This post was last edited by lxq700918 on 2009-2-14 11:26.]
Advantages of ammonia synthesis pre-reduction catalysts: Apart from reducing the catalyst reduction time, it can be said that there are no other advantages for catalysts of the same type. This can be understood from the production process of pre-reduced catalysts: all pre-reduced catalysts are obtained by reducing them from their oxidized state and then carrying out surface oxidation. As long as everyone understands this, I think there’s no need to say anything else.
During the formation of the passivation film in pre-reduced ammonia synthesis catalysts, although about 10% of the α-Fe is poisoned by oxygen, roughly 90% of the catalyst still gets reduced under conditions that are better than those in ammonia plants. Therefore, after reduction using a pre-reduced catalyst, its intrinsic activity is higher than that of an oxidized catalyst. This can be easily verified under experimental conditions, but in ammonia plants, due to factors such as the net ammonia value and ammonia production volume, which are not determined solely by the intrinsic activity of the catalyst, there are many other factors at play, making it difficult to provide exact figures. However, using a pre-reduction catalyst brings significant economic benefits to ammonia plants.
Amomax-10 is an iron-based catalyst produced by the Liaohe Catalyst Factory. It is widely used in large fertilizer plants, while it has not had a significant impact yet in medium-sized fertilizer plants. According to their sales staff, it is very good; it contains 8 types of accelerants. This post was last edited by Anhua Ren on 2009-3-3 at 00:24