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Operando UV-Raman study of the methanol to olefins reaction over SAPO-34: Spatiotemporal evolution monitored by different reactor approaches.

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Title: Operando UV-Raman study of the methanol to olefins reaction over SAPO-34: Spatiotemporal evolution monitored by different reactor approaches.
Authors: Signorile, Matteo1 (AUTHOR) matteo.signorile@unito.it, Rojo Gama, Daniel2,3 (AUTHOR), Bonino, Francesca1 (AUTHOR), Svelle, Stian2 (AUTHOR), Beato, Pablo3 (AUTHOR), Bordiga, Silvia1 (AUTHOR)
Source: Catalysis Today. Oct2019, Vol. 336, p203-209. 7p.
Subjects: Laser beam measurement, Alkenes, Ultraviolet lasers, Pebble bed reactors, Methanol, Fluidized-bed combustion
Abstract: • Methanol to Olefins over SAPO-34 was investigated by operando UV-Raman spectroscopy. • Two different setups avoiding the laser induced sample damaging were exploited. • The choice of reactor affects the spatiotemporal deactivation path of SAPO-34. A molecular understanding of coke formation during the methanol to olefins (MTO) reaction is of great importance in order to adopt strategies that can improve the lifetime of the catalyst. UV-Raman has proven to be a valuable characterization tool, because of the favorable resonance conditions achieved towards key coke components, e.g. aromatic and olefinic compounds. Still, the applicability of UV-Raman in MTO is limited by the high risk of inducing sample damage under the exposure to the intense UV excitation laser. This drawback has been addressed by specific experimental setups, exploiting the concept of sample movement under the laser beam during the measurement, so that the laser-sample interaction is minimized by averaging over a wider sample surface. In this work, the impact of two different experimental setups, both relying on sample movement, are evaluated for the operando investigation of the MTO reaction over a SAPO-34. While in one case the whole catalytic bed is moved (fluidized bed), in the other case the sample is pressed into a pellet and rotated. Due to the peculiar spatial evolution of the reaction zone during MTO in a fixed-bed reactor, each method provides valuable information, but at very different spatiotemporal scales. [ABSTRACT FROM AUTHOR]
Copyright of Catalysis Today is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
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  Data: Operando UV-Raman study of the methanol to olefins reaction over SAPO-34: Spatiotemporal evolution monitored by different reactor approaches.
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  Data: <searchLink fieldCode="AR" term="%22Signorile%2C+Matteo%22">Signorile, Matteo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> matteo.signorile@unito.it</i><br /><searchLink fieldCode="AR" term="%22Rojo+Gama%2C+Daniel%22">Rojo Gama, Daniel</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bonino%2C+Francesca%22">Bonino, Francesca</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Svelle%2C+Stian%22">Svelle, Stian</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Beato%2C+Pablo%22">Beato, Pablo</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bordiga%2C+Silvia%22">Bordiga, Silvia</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Catalysis+Today%22">Catalysis Today</searchLink>. Oct2019, Vol. 336, p203-209. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Laser+beam+measurement%22">Laser beam measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Alkenes%22">Alkenes</searchLink><br /><searchLink fieldCode="DE" term="%22Ultraviolet+lasers%22">Ultraviolet lasers</searchLink><br /><searchLink fieldCode="DE" term="%22Pebble+bed+reactors%22">Pebble bed reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Methanol%22">Methanol</searchLink><br /><searchLink fieldCode="DE" term="%22Fluidized-bed+combustion%22">Fluidized-bed combustion</searchLink>
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  Data: • Methanol to Olefins over SAPO-34 was investigated by operando UV-Raman spectroscopy. • Two different setups avoiding the laser induced sample damaging were exploited. • The choice of reactor affects the spatiotemporal deactivation path of SAPO-34. A molecular understanding of coke formation during the methanol to olefins (MTO) reaction is of great importance in order to adopt strategies that can improve the lifetime of the catalyst. UV-Raman has proven to be a valuable characterization tool, because of the favorable resonance conditions achieved towards key coke components, e.g. aromatic and olefinic compounds. Still, the applicability of UV-Raman in MTO is limited by the high risk of inducing sample damage under the exposure to the intense UV excitation laser. This drawback has been addressed by specific experimental setups, exploiting the concept of sample movement under the laser beam during the measurement, so that the laser-sample interaction is minimized by averaging over a wider sample surface. In this work, the impact of two different experimental setups, both relying on sample movement, are evaluated for the operando investigation of the MTO reaction over a SAPO-34. While in one case the whole catalytic bed is moved (fluidized bed), in the other case the sample is pressed into a pellet and rotated. Due to the peculiar spatial evolution of the reaction zone during MTO in a fixed-bed reactor, each method provides valuable information, but at very different spatiotemporal scales. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Catalysis Today is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.cattod.2018.11.065
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        Text: English
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        Type: general
      – SubjectFull: Alkenes
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      – SubjectFull: Ultraviolet lasers
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      – SubjectFull: Pebble bed reactors
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      – SubjectFull: Methanol
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      – SubjectFull: Fluidized-bed combustion
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      – TitleFull: Operando UV-Raman study of the methanol to olefins reaction over SAPO-34: Spatiotemporal evolution monitored by different reactor approaches.
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              Text: Oct2019
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