Doctoral Dissertations

Abstract

"Microporous zeolites are widely used as heterogeneous catalysts in a wide variety of chemical and petrochemical industries to produce value-added chemicals and fuels, owing to their large surface area, acid-base properties, high thermal stability, and excellent shape-selectivity.

The overall goal of this research was to shape engineer composite zeolites and fine-tune their physiochemical properties to improve the catalytic production of dimethyl ether (DME) and light olefins that are typically used as substitution to diesel fuel and polymer precursors, respectively. Specifically, HZSM-5 and silicalite-1 zeolites were formulated into monolithic contactors using 3D printing technique, followed by subsequent SAPO-34 crystals growth through a secondary hydrothermal method to produce zeolite composites of core-shell structure with controlled micro-meso-macro-porosity. Furthermore, the 3D-printed ZSM-5 monoliths were doped with various metals such as Cr, Ga, Cu, Y, Mo, and Zn to control their surface acidity, and used as heterogeneous catalysts in light olefins and DME production through methanol dehydration reaction.

Analysis of catalytic performance revealed enhancement in products yield and improvement in catalyst stability. Due to the synergistic integration of surface acidity and hierarchical porosity, high yield of light olefins (70%) and DME (80%), and excellent anti-coking stability were demonstrated”--Abstract, page iv.

Advisor(s)

Rownaghi, Ali A.

Committee Member(s)

Ludlow, Douglas K.
Rezaei, Fateme
Lueking, Angela D.
Ferdowsi, Mehdi

Department(s)

Chemical and Biochemical Engineering

Degree Name

Ph. D. in Chemical Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2020

Journal article titles appearing in thesis/dissertation

  • 3D-printed ZSM-5 monoliths with metal dopants for methanol conversion in the presence and absence of carbon dioxide
  • 3D-printed HZSM-5 and 3D-HZM5@SAPO-34 structured monoliths with controlled acidity and porosity for conversion of methanol to dimethyl ether
  • Design and synthesis of Ga, Zr, and V-doped 3D-printed ZSM-5 monolithic catalysts for selective formation of DME from methanol

Pagination

xiii, 94 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2020 Fatima Mahgoub Magzoub, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 11981

Electronic OCLC #

1313117372

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