G. Seo et al., THE ROLE OF CARBONACEOUS DEPOSITS IN THE SKELETAL ISOMERIZATION OF 1-BUTENE OVER FERRIERITE ZEOLITES, Catalysis letters, 41(3-4), 1996, pp. 189-194
The inner pores of ferrierite (FER) with a Si/Al ratio of 21 have been
modified by plasma-polymerized propylene loading and subsequent therm
al treatment under a flow of He at 550 degrees C in order to identify
the exact role of carbonaceous deposits (coke) in the skeletal isomeri
zation of 1-butene. It was found that even a small weight loading (0.8
wt%) of carbonaceous deposits within the inner pores of FER zeolite w
as sufficient to modify the pore structure of the zeolite, leading to
a noticeable enhancement of the selectivity to isobutene. This may be
attributed to the increased spatial constraints inside the pores which
restrict undesired side reactions, such as 1-butene dimerization foll
owed by cracking to light hydrocarbons.