How many stages are there in catalyst reduction?

The reduction process can be roughly divided into the following stages. 1 ； Heating phase: This process involves only the removal of trace amounts of physical water, so the heating rate can be reasonably fast, typically at 40–50°C/h. 2 ； Early reduction stage: At the beginning of the reduction reaction, the reaction is not intense; the water vapor concentration generally does not exceed the specified limits. It is appropriate to control the temperature increase rate at 8–10°C. 3 ； Reduction main period: Due to the intense reaction, water vapor levels may exceed the specified limits; controlling the rate of temperature increase can be used to regulate the water vapor concentration. 4 ； Late reduction stage: The reduction process is nearing completion; adjustments can be made to certain parameters as needed. For cold-tube type synthesis towers, it is necessary to maximize the temperature at the bottom of the bed layer and transition smoothly into the load adjustment phase.