Catalysts: Which domestic companies are currently most widely used?

Introduction to the reduction technology of low-pressure ammonia synthesis catalysts. The reduction of ammonia synthesis catalysts is an important step in the production of ammonia. The pressure level used in this reduction process is a key factor that determines the service life and activity of the catalysts, as well as the specific consumption of ammonia and the production capacity of the ammonia synthesis plant. Under normal circumstances, the reduction pressure values for synthetic catalysts recommended by catalyst manufacturers and those used by various ammonia production plants are around 5 MPa. Through relevant calculations and coordination with the on-site equipment, this value can be reduced by half; as a result, the residence time of water vapor in the synthetic ammonia catalyst’s reducing gas within the synthesis tower is also reduced by half. In other words, the probability of the synthetic ammonia catalyst being damaged by water vapor in the reducing gas is decreased by half. The activity of the synthetic ammonia catalyst after final reduction is significantly improved. This is particularly evident in iron-based ammonia synthesis catalysts, as such catalysts have a low outlet water temperature and a fast reaction rate during the main production phase; if this water vapor is not removed from the tower in a timely manner, the ammonia synthesis catalyst will suffer severe contamination. These are also important reasons why many synthetic ammonia catalysts fail to demonstrate their advantages in actual production. Although catalyst manufacturers currently widely use pre-reduced catalysts to replace in-situ reduction, due to objective constraints, the use of pre-reduced catalysts can only shorten the heating and reduction time required for the catalysts; it cannot change the fact that these catalysts retain low activity after reduction, failing to achieve the desired results. This is also why the reduction of ammonia synthesis catalysts under low pressure is not merely a modification of a reduction parameter, but rather becomes an important aspect of the technology involved in ammonia production. Moreover, this pressure indicator cannot be reduced simply by wishing to do so, as it is subject to various constraints. Low-pressure ammonia synthesis reduction technology can not only be applied in chemical engineering

With the support of basic data, the appropriate pressure for the reduction of the ammonia synthesis catalyst can be determined based on the capacity of the on-site ammonia synthesis plant; furthermore, specific control measures can also be provided. If implemented, this technology will surely demonstrate its extraordinary unique appeal and remarkable economic benefits. It will also provide a fair assessment of some low-temperature brand synthetic ammonia catalysts, revealing their true high-quality qualities.

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