Li, Jiayuan
(2022)
Continuous Flow Hydrothermal Synthesis of ZSM-5 Zeolite.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
ZSM-5 is a particularly important zeolite to the industry owing to its unique structure and exceptional properties. It is typically synthesized under hydrothermal conditions in batch reactors. The batch synthesis method involves heating the reactants in an autoclave that is continually operated at high temperatures and autogenous pressures for serval hours or even a few days to finish the synthesis, which is highly wasteful in terms of energy, time, and operation. In light of the vast demands for zeolites and their wide range of applications, developing a fast and efficient synthesis process is highly desirable. Herein, we present a continuous flow synthesis process for ZSM-5 with vastly accelerated synthesis times (seconds rather than days) and a high production rate (~ 590 g/day). The approach is based on the direct mixing of a zeolite precursor with hot pressurized water in a tubular flow reactor, resulting in a rapidly achieved high-temperature condition (~280 ℃,100 bar) to accelerate zeolite crystallization, followed by rapid cooling to prevent undesired reactions. By combining the excellent mass transfer rate in a continuous flow reactor with the instantaneous heating achieved by the direct mixing with pressured hot water, this design can facilitate the future mass production of zeolites.
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Details
| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
10 June 2022 |
| Date Type: |
Publication |
| Defense Date: |
30 March 2022 |
| Approval Date: |
10 June 2022 |
| Submission Date: |
13 April 2022 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
81 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Chemical Engineering |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Continuous Flow, Hydrothermal Synthesis, ZSM-5, Zeolite |
| Date Deposited: |
10 Jun 2022 19:32 |
| Last Modified: |
10 Jun 2022 19:32 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/42604 |
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