Title page for ETD etd-10202005-102804
|Type of Document
||Reaction of meta-diisopropylbenzene on acid molecular sieves and synthesis of zeolites by a vapor phase transport method
|Davis, Mark E.
|Conger, WIlliam L.
|Cox, David F.
|Velander, William H.
|Wills, George B.
- Molecular sieves.
|Date of Defense
Meta-diisopropylbenzene is reacted with propylene over
the acid form of the molecular sieves SAPO-5, mordenite,
offretite, beta, hexagonal and cubic faujasite (hex and FAU), L, SAPO-37, and an amorphous silica-alumina at temperatures
around 463 K in a flow-type fixed-bed reactor. A small amount
of cracking is observed. The main reactions of meta-diisopropylbenzene are isomerization and alkylation. This
alkylation is proposed as a new test reaction to characterize
the effective size of the voids in larger pore (12 T-atom
rings or above) molecular sieves by measuring the amount ratio
of formed 1,3,5- to 1,2,4-triisopropylbenzene. In most cases,
this ratio increases with the increasing effective void size
of the molecular sieves in the order: SAPO-5 < mordenite < offretite < beta < hex = FAU < L < SAPO-37 < amorphous silica-alumina.
Since samples with the FAU topology show lower
selectivities to 1,3,5-triisopropylbenzene than the
mesoporous, amorphous silica-alumina, pore curvature has an influence on alkylation selectivity even for voids of 13 A
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