Deactivation of catalysts for the oxidative production of formaldehyde via the iron-molybdenum methanol method
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What are the methods available to extend the service life of catalysts used in the oxidation production of formaldehyde via the iron-molybdenum methanol method, and what are the issues related to catalyst deactivation?
Reduce the entry of toxins, minimize excessive temperature and pressure as well as pressure differences, and reduce temperature fluctuations and the number of start-up and shutdown cycles
Can long-term operation at low load extend the service life?
Use a better desulfurization catalyst for the desulfurization process earlier on, so as to remove as much organic sulfur as possible; ensure proper sulfidation during this step
It is generally difficult to maintain the deactivation of iron-molybdenum catalysts. . . . Molybdenum loss is essentially irreversible. If you really want to continue, you can cut off the feed, keep the temperature of the heat transfer oil above 200 degrees, and start the fan to maintain a high airflow rate for three days. . . But the effect is average. The toxins mainly include alkali metals, sulfur, oils, etc.