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A study on catalytic dehydration of 4-hydroxy-3-hexanone(HH)to 4-hexen-3-one(HO)was carried out through conversion of HH over HZSM-5 zeolite catalyst in a fixed-bed reactor(FBR)operating under atmospheric pressure.The test indicated a relatively high activity of the HZSM-5 zeolite capable of achieving a HH conversion of 99.2%and a HO yield of 83.5%.Catalyst deactivation could be prevented by increasing the reaction temperature by 10℃for every 20 h and adding 2.0%of piperidine in the feed.A catalyst stability test(for 100 h)in FBR showed that the catalyst was active even after 100 h of time-on-stream with HH conversion remaining at 99.2%and HO yield still reaching over 83.5%.Regeneration experiment showed that the regenerated catalyst demonstrated a catalytic performance comparable to the fresh one.
A study on catalytic dehydration of 4-hydroxy-3-hexanone (HH) to 4-hexen-3-one (HO) was carried out through conversion of HH over HZSM-5 zeolite catalyst in a fixed-bed reactor under atmospheric pressure. The test indicated a relatively high activity of the HZSM-5 zeolite capable of achieving a HH conversion of 99.2% and a HO yield of 83.5%. Catalyst deactivation could be prevented by increasing the reaction temperature by 10 ° C for every 20 h and adding 2.0% of piperidine in the feed. A catalyst stability test (for 100 h) in FBR showed that the catalyst was active even after 100 h of time-on-stream with HH conversion remaining at 99.2% and HO yield still reaching reached over 83.5%. Regeneration experiment showed that the regenerated catalyst demonstrated a catalytic performance comparable to the fresh one.