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The Research on the New Catalyst Material for Olefin Isomerization in FCC Gasoline

Author: FangDong
Tutor: ChenBiaoHua
School: Beijing University of Chemical Technology
Course: Chemical Engineering
Keywords: zeolites isomerization MOR-βzeolite
CLC: TE624.9
Type: Master's thesis
Year: 2007
Downloads: 159
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Abstract


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.

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CLC: > Industrial Technology > Oil and gas industry > Oil, natural gas processing industry > Petroleum refining > The refining process > Catalyst
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