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Structure-function relationship for CO 2 methanation over ceria supported Rh and Ni catalysts under atmospheric pressure conditions

Martin, Natalia M. LU ; Hemmingsson, Felix ; Schaefer, Andreas LU ; Ek, Martin LU orcid ; Merte, Lindsay R. LU ; Hejral, Uta LU ; Gustafson, Johan LU ; Skoglundh, Magnus ; Dippel, Ann Christin and Gutowski, Olof , et al. (2019) In Catalysis Science and Technology 9(7). p.1644-1653
Abstract


In situ structural and chemical state characterization of Rh/CeO
2
and Ni/CeO
2
catalysts during atmospheric pressure CO
2
methanation has been performed by a combined array of time-resolved analytical techniques including ambient-pressure X-ray photoelectron spectroscopy,... (More)


In situ structural and chemical state characterization of Rh/CeO
2
and Ni/CeO
2
catalysts during atmospheric pressure CO
2
methanation has been performed by a combined array of time-resolved analytical techniques including ambient-pressure X-ray photoelectron spectroscopy, high-energy X-ray diffraction and diffuse reflectance infrared Fourier transform spectroscopy. The ceria phase is partially reduced during the CO
2
methanation and in particular Ce
3+
species seem to facilitate activation of CO
2
molecules. The activated CO
2
molecules then react with atomic hydrogen provided from H
2
dissociation on Rh and Ni sites to form formate species. For the most active catalyst (Rh/CeO
2
), transmission electron microscopy measurements show that the Rh nanoparticles are small (average 4 nm, but with a long tail towards smaller particles) due to a strong interaction between Rh particles and the ceria phase. In contrast, larger nanoparticles were observed for the Ni/CeO
2
catalyst (average 6 nm, with no crystallites below 5 nm found), suggesting a weaker interaction with the ceria phase. The higher selectivity towards methane of Rh/CeO
2
is proposed to be due to the stronger metal-support interaction.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Catalysis Science and Technology
volume
9
issue
7
pages
10 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85063899545
ISSN
2044-4753
DOI
10.1039/c8cy02097c
project
Understanding of Catalysts for Climate-Neutral Chemicals by in situ Transmission Electron Microscopy Characterization
language
English
LU publication?
yes
id
a2c233ff-edfe-4a40-abaa-d22af4f895a0
date added to LUP
2019-04-23 08:38:20
date last changed
2023-12-03 06:12:01
@article{a2c233ff-edfe-4a40-abaa-d22af4f895a0,
  abstract     = {{<p><br>
                                                         In situ structural and chemical state characterization of Rh/CeO                             <br>
                            <sub>2</sub><br>
                                                          and Ni/CeO                             <br>
                            <sub>2</sub><br>
                                                          catalysts during atmospheric pressure CO                             <br>
                            <sub>2</sub><br>
                                                          methanation has been performed by a combined array of time-resolved analytical techniques including ambient-pressure X-ray photoelectron spectroscopy, high-energy X-ray diffraction and diffuse reflectance infrared Fourier transform spectroscopy. The ceria phase is partially reduced during the CO                             <br>
                            <sub>2</sub><br>
                                                          methanation and in particular Ce                             <br>
                            <sup>3+</sup><br>
                                                          species seem to facilitate activation of CO                             <br>
                            <sub>2</sub><br>
                                                          molecules. The activated CO                             <br>
                            <sub>2</sub><br>
                                                          molecules then react with atomic hydrogen provided from H                             <br>
                            <sub>2</sub><br>
                                                          dissociation on Rh and Ni sites to form formate species. For the most active catalyst (Rh/CeO                             <br>
                            <sub>2</sub><br>
                                                         ), transmission electron microscopy measurements show that the Rh nanoparticles are small (average 4 nm, but with a long tail towards smaller particles) due to a strong interaction between Rh particles and the ceria phase. In contrast, larger nanoparticles were observed for the Ni/CeO                             <br>
                            <sub>2</sub><br>
                                                          catalyst (average 6 nm, with no crystallites below 5 nm found), suggesting a weaker interaction with the ceria phase. The higher selectivity towards methane of Rh/CeO                             <br>
                            <sub>2</sub><br>
                                                          is proposed to be due to the stronger metal-support interaction.                         <br>
                        </p>}},
  author       = {{Martin, Natalia M. and Hemmingsson, Felix and Schaefer, Andreas and Ek, Martin and Merte, Lindsay R. and Hejral, Uta and Gustafson, Johan and Skoglundh, Magnus and Dippel, Ann Christin and Gutowski, Olof and Bauer, Matthias and Carlsson, Per Anders}},
  issn         = {{2044-4753}},
  language     = {{eng}},
  number       = {{7}},
  pages        = {{1644--1653}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Catalysis Science and Technology}},
  title        = {{Structure-function relationship for CO                         
                        <sub>2</sub>
                                                  methanation over ceria supported Rh and Ni catalysts under atmospheric pressure conditions}},
  url          = {{http://dx.doi.org/10.1039/c8cy02097c}},
  doi          = {{10.1039/c8cy02097c}},
  volume       = {{9}},
  year         = {{2019}},
}