Problems with the use of butanol dehydrogenation catalysts

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Process: Butane and butylene are separated from C4 through a butylene separation system; butylene is then converted into sec-butanol via hydration. Sec-butanol is heated to vaporize and fed into a dehydrogenation reactor to produce crude methylethyl ketone, which is subsequently separated into pure methylethyl ketone using a refining unit. Butanol dehydrogenation catalyst: An FDH-type dehydrogenation catalyst is used; it is an endothermic reaction, and the heat required is supplied by heat transfer oil. After being used for a certain period of time, the activity of the dehydrogenation catalyst decreases, resulting in a lower conversion rate. Raising the temperature of the heat transfer oil increases the temperature of the dehydrogenation reactor, thereby improving the conversion rate. Problem: When the temperature of the heat transfer oil is increased by 1°C, the temperature of the dehydrogenation catalyst bed remains unchanged, but the outlet temperature rises by 4°C, with the conversion rate increasing from 62% to 64%. After the equipment operates for one night, the conversion rate drops back to 62%. The current outlet temperature of the reactor is 234 degrees. Under normal operation, each increase in temperature can be maintained for about 10 days. I would like to ask what the reason for this is