The Research On The New Catalyst Material For Olefin Isomerization In FCC Gasoline

The aim of our research is to improve the ability of olefin isomerizationin FCC process by developing new catalyst material.Different zeolites were evaluated by pure hydrocarbon pulse microreactorusing n-hexene as feedstock at 480℃. It is found that the rank to catalyzeolefin isomerization of those zeolites was HITQ-2＞Hβ＞HMCM-36＞HMCM-22＞HZSM-5. Under the same condition, the isomerization ability ofthose zeolites was evaluated by fixed-bed microreactor. The results show thatHβzeolite exhibits excellent catalytic activity for n-hexene isomerization,with the yield of isomerization product reaching 49.6%.Nanosize HMCM-49 zeolite was prepared. The n-hexene isomerizationover different HMCM-49 had been investigated in a fixed-bed microreactor. Itis found that, nanosize zeolite shows higher catalyzing activity for n-hexeneisomerization and higher total yield of isomerization product than micrometerzeolite. However, the activity to catalyze olefin isomerization of NanosizeHMCM-49 is inferior to that of Hβzeolite. Hβzeolites with different Si/Al ratio were prepared and investigated in thefixed-bed microreactor. It is found that, Hβzeolite with Si/Al ratio of 30exhibits higer catalytic activity for isomerization. After hydrothermal treatededat 800℃for, Hβzeolite maintain excellent stability and catalytic activity forn-hexene isomerization.Though Hβshows excellent isomerization ability, the yield of propene islow in our research, in order to increase the propene yield, HMOR-βwasprapared. The result shows that the catalytic stability of HMOR-βis prior toHβzeolitewith the yield of propene increasese sharply.