Surface chemistry of tailored ceria nanoparticles: interaction with CO and H2O

Shilpa Agarwal

Research output: ThesisPhD Thesis - Research UT, graduation UT

68 Downloads (Pure)

Abstract

Steam reforming of bio-oil combined with the gasification of coke deposits in the presence of water is a conceptually promising alternative to generate hydrogen gas. H2O can be activated in the gasification stage to form hydroxyl groups (OH) on oxide-supported (like ceria) metal catalysts, which increases both the H2 yield and the catalyst’s lifetime. The reactivity for the water dissociation as well as the reactivity of resulting hydroxyl groups can be further improved by altering the shape and size of ceria support. Based on the recent studies, ceria nanoshapes exhibit excellent redox properties and high specific activity/selectivity in comparison to the bulk ceria particles. However, the knowledge related to the surface species actually responsible for enhanced catalytic activity of ceria nanocatalysts so far remain lacking. The work presented in this thesis highlights the fundamental aspects of ceria nanoshapes, with emphasis on the effects of surface planes on overall catalytic performance. The main objectives of this work are to investigate the true exposed facets, as well as to understand the reactivity of hydroxyl species and the role of defects on the ceria nanoshapes.
Original languageEnglish
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Lefferts, Leon, Supervisor
  • Mojet, Barbara, Advisor
Award date3 Apr 2014
Place of PublicationEnschede
Publisher
Print ISBNs978-90-365-3641-7
DOIs
Publication statusPublished - 3 Apr 2014

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Cerium compounds
Carbon Monoxide
Surface chemistry
Nanoparticles
Hydroxyl Radical
Gasification
Catalysts
Water
Steam reforming
Coke
Hydrogen
Catalyst activity
Oils
Deposits
Gases
Metals
Defects

Keywords

  • METIS-303186
  • IR-90275

Cite this

Agarwal, Shilpa. / Surface chemistry of tailored ceria nanoparticles: interaction with CO and H2O. Enschede : Universiteit Twente, 2014. 169 p.
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Surface chemistry of tailored ceria nanoparticles: interaction with CO and H2O. / Agarwal, Shilpa.

Enschede : Universiteit Twente, 2014. 169 p.

Research output: ThesisPhD Thesis - Research UT, graduation UT

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T1 - Surface chemistry of tailored ceria nanoparticles: interaction with CO and H2O

AU - Agarwal, Shilpa

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N2 - Steam reforming of bio-oil combined with the gasification of coke deposits in the presence of water is a conceptually promising alternative to generate hydrogen gas. H2O can be activated in the gasification stage to form hydroxyl groups (OH) on oxide-supported (like ceria) metal catalysts, which increases both the H2 yield and the catalyst’s lifetime. The reactivity for the water dissociation as well as the reactivity of resulting hydroxyl groups can be further improved by altering the shape and size of ceria support. Based on the recent studies, ceria nanoshapes exhibit excellent redox properties and high specific activity/selectivity in comparison to the bulk ceria particles. However, the knowledge related to the surface species actually responsible for enhanced catalytic activity of ceria nanocatalysts so far remain lacking. The work presented in this thesis highlights the fundamental aspects of ceria nanoshapes, with emphasis on the effects of surface planes on overall catalytic performance. The main objectives of this work are to investigate the true exposed facets, as well as to understand the reactivity of hydroxyl species and the role of defects on the ceria nanoshapes.

AB - Steam reforming of bio-oil combined with the gasification of coke deposits in the presence of water is a conceptually promising alternative to generate hydrogen gas. H2O can be activated in the gasification stage to form hydroxyl groups (OH) on oxide-supported (like ceria) metal catalysts, which increases both the H2 yield and the catalyst’s lifetime. The reactivity for the water dissociation as well as the reactivity of resulting hydroxyl groups can be further improved by altering the shape and size of ceria support. Based on the recent studies, ceria nanoshapes exhibit excellent redox properties and high specific activity/selectivity in comparison to the bulk ceria particles. However, the knowledge related to the surface species actually responsible for enhanced catalytic activity of ceria nanocatalysts so far remain lacking. The work presented in this thesis highlights the fundamental aspects of ceria nanoshapes, with emphasis on the effects of surface planes on overall catalytic performance. The main objectives of this work are to investigate the true exposed facets, as well as to understand the reactivity of hydroxyl species and the role of defects on the ceria nanoshapes.

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