Testing Metal–Organic Framework Catalysts in a Microreactor for Ethyl Paraoxon Hydrolysis
We explored the practical advantages and limitations of applying a <b>UiO-66</b>-based metal–organic framework (MOF) catalyst in a flow microreactor demonstrated by the catalytic hydrolysis of ethyl paraoxon, an organophosphorus chemical agent. The influences of the following factors on...
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doaj-b91c965b86a843609ab29a1bef756cfe2020-11-25T03:57:31ZengMDPI AGCatalysts2073-43442020-10-01101159115910.3390/catal10101159Testing Metal–Organic Framework Catalysts in a Microreactor for Ethyl Paraoxon HydrolysisPalani Elumalai0Nagat Elrefaei1Wenmiao Chen2Ma’moun Al-Rawashdeh3Sherzod T. Madrahimov4Chemistry Department, Texas A&M University at Qatar, Doha, QatarChemical Engineering Department, Texas A&M University at Qatar, Doha, QatarChemistry Department, Texas A&M University at Qatar, Doha, QatarChemical Engineering Department, Texas A&M University at Qatar, Doha, QatarChemistry Department, Texas A&M University at Qatar, Doha, QatarWe explored the practical advantages and limitations of applying a <b>UiO-66</b>-based metal–organic framework (MOF) catalyst in a flow microreactor demonstrated by the catalytic hydrolysis of ethyl paraoxon, an organophosphorus chemical agent. The influences of the following factors on the reaction yield were investigated: a) catalyst properties such as crystal size (14, 200, and 540 nm), functionality (NH<sub>2</sub> group), and particle size, and b) process conditions: temperature (20, 40, and 60 °C), space times, and concentration of the substrate. In addition, long-term catalyst stability was tested with an 18 h continuous run. We found that tableting and sieving is a viable method to obtain MOF particles of a suitable size to be successfully screened under flow conditions in a microreactor. This method was used successfully to study the effects of crystal size, functionality, temperature, reagent concentration, and residence time. Catalyst particles with a sieved fraction between 125 and 250 µm were found to be optimal. A smaller sieved fraction size showed a major limitation due to the very high pressure drop. The low apparent activation energy indicated that internal mass transfer may exist. A dedicated separate study is required to assess the impact of pore diffusion and site accessibility.https://www.mdpi.com/2073-4344/10/10/1159MOFcatalystmicroreactorkinetic studies |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Palani Elumalai Nagat Elrefaei Wenmiao Chen Ma’moun Al-Rawashdeh Sherzod T. Madrahimov |
spellingShingle |
Palani Elumalai Nagat Elrefaei Wenmiao Chen Ma’moun Al-Rawashdeh Sherzod T. Madrahimov Testing Metal–Organic Framework Catalysts in a Microreactor for Ethyl Paraoxon Hydrolysis Catalysts MOF catalyst microreactor kinetic studies |
author_facet |
Palani Elumalai Nagat Elrefaei Wenmiao Chen Ma’moun Al-Rawashdeh Sherzod T. Madrahimov |
author_sort |
Palani Elumalai |
title |
Testing Metal–Organic Framework Catalysts in a Microreactor for Ethyl Paraoxon Hydrolysis |
title_short |
Testing Metal–Organic Framework Catalysts in a Microreactor for Ethyl Paraoxon Hydrolysis |
title_full |
Testing Metal–Organic Framework Catalysts in a Microreactor for Ethyl Paraoxon Hydrolysis |
title_fullStr |
Testing Metal–Organic Framework Catalysts in a Microreactor for Ethyl Paraoxon Hydrolysis |
title_full_unstemmed |
Testing Metal–Organic Framework Catalysts in a Microreactor for Ethyl Paraoxon Hydrolysis |
title_sort |
testing metal–organic framework catalysts in a microreactor for ethyl paraoxon hydrolysis |
publisher |
MDPI AG |
series |
Catalysts |
issn |
2073-4344 |
publishDate |
2020-10-01 |
description |
We explored the practical advantages and limitations of applying a <b>UiO-66</b>-based metal–organic framework (MOF) catalyst in a flow microreactor demonstrated by the catalytic hydrolysis of ethyl paraoxon, an organophosphorus chemical agent. The influences of the following factors on the reaction yield were investigated: a) catalyst properties such as crystal size (14, 200, and 540 nm), functionality (NH<sub>2</sub> group), and particle size, and b) process conditions: temperature (20, 40, and 60 °C), space times, and concentration of the substrate. In addition, long-term catalyst stability was tested with an 18 h continuous run. We found that tableting and sieving is a viable method to obtain MOF particles of a suitable size to be successfully screened under flow conditions in a microreactor. This method was used successfully to study the effects of crystal size, functionality, temperature, reagent concentration, and residence time. Catalyst particles with a sieved fraction between 125 and 250 µm were found to be optimal. A smaller sieved fraction size showed a major limitation due to the very high pressure drop. The low apparent activation energy indicated that internal mass transfer may exist. A dedicated separate study is required to assess the impact of pore diffusion and site accessibility. |
topic |
MOF catalyst microreactor kinetic studies |
url |
https://www.mdpi.com/2073-4344/10/10/1159 |
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