Title page for ETD etd-10202005-102804


Type of Document Dissertation
Author Kim, Man-Hoe
URN etd-10202005-102804
Title Reaction of meta-diisopropylbenzene on acid molecular sieves and synthesis of zeolites by a vapor phase transport method
Degree PhD
Department Chemical Engineering
Advisory Committee
Advisor Name Title
Davis, Mark E. Committee Chair
Conger, WIlliam L. Committee Member
Cox, David F. Committee Member
Velander, William H. Committee Member
Wills, George B. Committee Member
Keywords
  • Crystallization.
  • Zeolites.
  • Molecular sieves.
  • Isomerization.
  • Alkylation.
Date of Defense 1992-05-15
Availability restricted
Abstract

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 size.

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