What impact does it have on the catalyst if the temperature in the ammonia synthesis furnace exceeds 500 degrees for 3 hours, resulting in an imbalance in the hydrogen-to-nitrogen ratio?
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What impact does it have on the catalyst if the temperature in the ammonia synthesis furnace exceeds 500 degrees for 3 hours, resulting in an imbalance in the hydrogen-to-nitrogen ratio?
It depends on the initial reduction temperature of the catalyst. The reduction temperature of the catalyst should always be lower than its maximum operating temperature; operating at high temperatures for extended periods can cause the crystal grains to grow, which reduces the catalyst’s activity. However, short-term exposure to such high temperatures may have little effect
The impact in a short period of time is not significant, but over an extended period it can lead to catalyst sintering. Additionally, depending on the type of catalyst, some are designed to withstand high temperatures, requiring operation at temperatures above 500 degrees Celsius during the production process
Looking at the over-temperature range, there is no issue below 530 degrees
It mainly depends on whether the catalyst’s activity has been impaired. Generally, the manufacturer will specify an upper limit for the operating temperature of the catalyst, indicating by how much degrees and for how long it is permissible to exceed this limit. Generally, operating at 500 degrees should be fine, and short-term operation above 520°C is also no problem.