Nature and location of carbonaceous species in a composite HZSM-5 zeolite catalyst during the conversion of dimethyl ether into light olefins

María Ibáñez; Paula Pérez-Uriarte; Miguel Sánchez-Contador; Tomás Cordero-Lanzac; Andrés T. Aguayo; Javier Bilbao; Pedro Castaño

doi:10.3390/catal7090254

Nature and location of carbonaceous species in a composite HZSM-5 zeolite catalyst during the conversion of dimethyl ether into light olefins

María Ibáñez, Paula Pérez-Uriarte, Miguel Sánchez-Contador, Tomás Cordero-Lanzac, Andrés T. Aguayo, Javier Bilbao, Pedro Castaño^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

The deactivation of a composite catalyst based on HZSM-5 zeolite (agglomerated in a matrix using boehmite as a binder) has been studied during the transformation of dimethyl ether into light olefins. The location of the trapped/retained species (on the zeolite or on the matrix) has been analyzed by comparing the properties of the fresh and deactivated catalyst after runs at different temperatures, while the nature of those species has been studied using different spectroscopic and thermogravimetric techniques. The reaction occurs on the strongest acid sites of the zeolite micropores through olefins and alkyl-benzenes as intermediates. These species also condensate into bulkier structures (polyaromatics named as coke), particularly at higher temperatures and within the mesoand macropores of the matrix. The critical roles of the matrix and water in the reaction medium have been proved: both attenuating the effect of coke deposition.

Original language	English (US)
Article number	254
Journal	Catalysts
Volume	7
Issue number	9
DOIs	https://doi.org/10.3390/catal7090254
State	Published - Sep 2017
Externally published	Yes

Bibliographical note

Funding Information:
Acknowledgments: The financial support of this work was undertaken by the Ministry of Economy and Competitiveness of the Spanish Government, some cofounded with ERDF funds (Project CTQ2013-46172-P, CTQ2013-46173-R and CTQ2016-79646-P projects), by the Basque Government (Project IT748-13) and by the University of the Basque Country (UFI 11/39). M. Ibáñez is grateful for the postgraduate grant from the University of the Basque Country (No. UPV/EHU2016).

Publisher Copyright:
© 2017 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

Coke
Dimethyl ether (DME)
Light olefins
Propylene
ZSM-5 (MFI) zeolite

ASJC Scopus subject areas

Catalysis
Physical and Theoretical Chemistry

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10.3390/catal7090254

Cite this

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title = "Nature and location of carbonaceous species in a composite HZSM-5 zeolite catalyst during the conversion of dimethyl ether into light olefins",

abstract = "The deactivation of a composite catalyst based on HZSM-5 zeolite (agglomerated in a matrix using boehmite as a binder) has been studied during the transformation of dimethyl ether into light olefins. The location of the trapped/retained species (on the zeolite or on the matrix) has been analyzed by comparing the properties of the fresh and deactivated catalyst after runs at different temperatures, while the nature of those species has been studied using different spectroscopic and thermogravimetric techniques. The reaction occurs on the strongest acid sites of the zeolite micropores through olefins and alkyl-benzenes as intermediates. These species also condensate into bulkier structures (polyaromatics named as coke), particularly at higher temperatures and within the mesoand macropores of the matrix. The critical roles of the matrix and water in the reaction medium have been proved: both attenuating the effect of coke deposition.",

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author = "Mar{\'i}a Ib{\'a}{\~n}ez and Paula P{\'e}rez-Uriarte and Miguel S{\'a}nchez-Contador and Tom{\'a}s Cordero-Lanzac and Aguayo, {Andr{\'e}s T.} and Javier Bilbao and Pedro Casta{\~n}o",

note = "Funding Information: Acknowledgments: The financial support of this work was undertaken by the Ministry of Economy and Competitiveness of the Spanish Government, some cofounded with ERDF funds (Project CTQ2013-46172-P, CTQ2013-46173-R and CTQ2016-79646-P projects), by the Basque Government (Project IT748-13) and by the University of the Basque Country (UFI 11/39). M. Ib{\'a}{\~n}ez is grateful for the postgraduate grant from the University of the Basque Country (No. UPV/EHU2016). Publisher Copyright: {\textcopyright} 2017 by the authors. Licensee MDPI, Basel, Switzerland.",

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AU - Cordero-Lanzac, Tomás

AU - Aguayo, Andrés T.

AU - Bilbao, Javier

AU - Castaño, Pedro

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N2 - The deactivation of a composite catalyst based on HZSM-5 zeolite (agglomerated in a matrix using boehmite as a binder) has been studied during the transformation of dimethyl ether into light olefins. The location of the trapped/retained species (on the zeolite or on the matrix) has been analyzed by comparing the properties of the fresh and deactivated catalyst after runs at different temperatures, while the nature of those species has been studied using different spectroscopic and thermogravimetric techniques. The reaction occurs on the strongest acid sites of the zeolite micropores through olefins and alkyl-benzenes as intermediates. These species also condensate into bulkier structures (polyaromatics named as coke), particularly at higher temperatures and within the mesoand macropores of the matrix. The critical roles of the matrix and water in the reaction medium have been proved: both attenuating the effect of coke deposition.

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KW - Propylene

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Nature and location of carbonaceous species in a composite HZSM-5 zeolite catalyst during the conversion of dimethyl ether into light olefins

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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