Investigation of the Dynamics of 1-Octene Adsorption at 293 K in a ZSM-5 Catalyst by Inelastic and Quasielastic Neutron Scattering

Alexander P. Hawkins, Alexander J. O'Malley, Andrea Zachariou, Paul Collier, Russell A. Ewings, Ian P. Silverwood, Russell F. Howe, Stewart F. Parker, David Lennon* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The properties of 1-octene adsorbed in zeolite ZSM-5 at 293 K are studied by means of inelastic and quasielastic neutron scatterings (INS and QENS) to investigate interactions relevant to the zeolite solid acid catalysis of fluidized catalytic cracking reactions. The INS spectrum is compared to that recorded for the solid alkene and reveals significant changes of bonding on adsorption at ambient temperatures; the changes are attributed to the oligomerization of the adsorbed 1-octene to form a medium chain n-alkane or n-alkane cation. QENS analysis shows that these oligomers are immobilized within the zeolite pore structure, but a temperature-dependant fraction is able to rotate around their long axis within the pore channels.

Original languageEnglish
Pages (from-to)417-425
Number of pages9
JournalJournal of Physical Chemistry C
Volume123
Issue number1
Early online date13 Dec 2018
DOIs
Publication statusPublished - 1 Oct 2019

Fingerprint

Zeolites
Alkanes
Neutron scattering
Paraffins
alkanes
neutron scattering
porosity
Adsorption
catalysts
Oligomerization
Catalytic cracking
Catalysts
adsorption
Alkenes
Pore structure
oligomers
Oligomers
Catalysis
alkenes
Olefins

Keywords

  • CRACKING
  • DIFFUSION
  • PROPENE
  • ALKANES
  • OLEFINS
  • FCC
  • VISUALIZATION
  • SPECTROSCOPY
  • MECHANISMS
  • SOFTWARE

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

Cite this

Hawkins, A. P., O'Malley, A. J., Zachariou, A., Collier, P., Ewings, R. A., Silverwood, I. P., ... Lennon, D. (2019). Investigation of the Dynamics of 1-Octene Adsorption at 293 K in a ZSM-5 Catalyst by Inelastic and Quasielastic Neutron Scattering. Journal of Physical Chemistry C, 123(1), 417-425. https://doi.org/10.1021/acs.jpcc.8b08420

Investigation of the Dynamics of 1-Octene Adsorption at 293 K in a ZSM-5 Catalyst by Inelastic and Quasielastic Neutron Scattering. / Hawkins, Alexander P.; O'Malley, Alexander J.; Zachariou, Andrea; Collier, Paul; Ewings, Russell A.; Silverwood, Ian P.; Howe, Russell F.; Parker, Stewart F.; Lennon, David (Corresponding Author).

In: Journal of Physical Chemistry C, Vol. 123, No. 1, 01.10.2019, p. 417-425.

Research output: Contribution to journalArticle

Hawkins, AP, O'Malley, AJ, Zachariou, A, Collier, P, Ewings, RA, Silverwood, IP, Howe, RF, Parker, SF & Lennon, D 2019, 'Investigation of the Dynamics of 1-Octene Adsorption at 293 K in a ZSM-5 Catalyst by Inelastic and Quasielastic Neutron Scattering', Journal of Physical Chemistry C, vol. 123, no. 1, pp. 417-425. https://doi.org/10.1021/acs.jpcc.8b08420
Hawkins, Alexander P. ; O'Malley, Alexander J. ; Zachariou, Andrea ; Collier, Paul ; Ewings, Russell A. ; Silverwood, Ian P. ; Howe, Russell F. ; Parker, Stewart F. ; Lennon, David. / Investigation of the Dynamics of 1-Octene Adsorption at 293 K in a ZSM-5 Catalyst by Inelastic and Quasielastic Neutron Scattering. In: Journal of Physical Chemistry C. 2019 ; Vol. 123, No. 1. pp. 417-425.
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title = "Investigation of the Dynamics of 1-Octene Adsorption at 293 K in a ZSM-5 Catalyst by Inelastic and Quasielastic Neutron Scattering",
abstract = "The properties of 1-octene adsorbed in zeolite ZSM-5 at 293 K are studied by means of inelastic and quasielastic neutron scatterings (INS and QENS) to investigate interactions relevant to the zeolite solid acid catalysis of fluidized catalytic cracking reactions. The INS spectrum is compared to that recorded for the solid alkene and reveals significant changes of bonding on adsorption at ambient temperatures; the changes are attributed to the oligomerization of the adsorbed 1-octene to form a medium chain n-alkane or n-alkane cation. QENS analysis shows that these oligomers are immobilized within the zeolite pore structure, but a temperature-dependant fraction is able to rotate around their long axis within the pore channels.",
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note = "Johnson Matthey plc and the EPSRC are thanked for postgraduate student support (A.P.H., A.Z.) via the Industrial CASE scheme. Johnson Matthey plc is additionally thanked for provision of the ZSM-5 catalyst. A.J.O. acknowledges the Ramsay Memorial Trust for the provision of a Ramsay Memorial Fellowship. The Science and Technology Facilities Council is thanked for the provision of neutron beamtime. The resources and support provided by the UK Catalysis Hub via membership of the UK Catalysis Hub consortium and funded by EPSRC (grants EP/K014706/1, EP/K014668/1, EP/K014854/1, EP/K014714/1, and EP/M013219/1) are gratefully acknowledged. Daniel Dervin (Queens University Belfast) is thanked for useful discussions on the principles of QENS analysis.",
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AU - Zachariou, Andrea

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AU - Ewings, Russell A.

AU - Silverwood, Ian P.

AU - Howe, Russell F.

AU - Parker, Stewart F.

AU - Lennon, David

N1 - Johnson Matthey plc and the EPSRC are thanked for postgraduate student support (A.P.H., A.Z.) via the Industrial CASE scheme. Johnson Matthey plc is additionally thanked for provision of the ZSM-5 catalyst. A.J.O. acknowledges the Ramsay Memorial Trust for the provision of a Ramsay Memorial Fellowship. The Science and Technology Facilities Council is thanked for the provision of neutron beamtime. The resources and support provided by the UK Catalysis Hub via membership of the UK Catalysis Hub consortium and funded by EPSRC (grants EP/K014706/1, EP/K014668/1, EP/K014854/1, EP/K014714/1, and EP/M013219/1) are gratefully acknowledged. Daniel Dervin (Queens University Belfast) is thanked for useful discussions on the principles of QENS analysis.

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N2 - The properties of 1-octene adsorbed in zeolite ZSM-5 at 293 K are studied by means of inelastic and quasielastic neutron scatterings (INS and QENS) to investigate interactions relevant to the zeolite solid acid catalysis of fluidized catalytic cracking reactions. The INS spectrum is compared to that recorded for the solid alkene and reveals significant changes of bonding on adsorption at ambient temperatures; the changes are attributed to the oligomerization of the adsorbed 1-octene to form a medium chain n-alkane or n-alkane cation. QENS analysis shows that these oligomers are immobilized within the zeolite pore structure, but a temperature-dependant fraction is able to rotate around their long axis within the pore channels.

AB - The properties of 1-octene adsorbed in zeolite ZSM-5 at 293 K are studied by means of inelastic and quasielastic neutron scatterings (INS and QENS) to investigate interactions relevant to the zeolite solid acid catalysis of fluidized catalytic cracking reactions. The INS spectrum is compared to that recorded for the solid alkene and reveals significant changes of bonding on adsorption at ambient temperatures; the changes are attributed to the oligomerization of the adsorbed 1-octene to form a medium chain n-alkane or n-alkane cation. QENS analysis shows that these oligomers are immobilized within the zeolite pore structure, but a temperature-dependant fraction is able to rotate around their long axis within the pore channels.

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