Behavior of Pt atoms on oxide supports during reduction treatments at elevated temperatures, characterized by aberration corrected stem imaging. Bradley, S., Sinkler, W., Blom, D., Bigelow, W., Voyles, P., & Allard, L. Catalysis Letters, 142(2):176-182, 2012. cited By 8![Behavior of Pt atoms on oxide supports during reduction treatments at elevated temperatures, characterized by aberration corrected stem imaging [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Aberration-corrected scanning transmission electron microscopy at the sub-Ångström resolution allows imaging the structure of catalytic materials at the single atom level and permits fundamental studies of the behavior of heavy metal catalytic species as a result of elevated temperature gas-treatments. The present study is aimed at understanding the development of clusters and nanoparticles of Pt on γ-alumina during reduction treatments of a pre-oxidized highly dispersed catalyst. A special built ex situ reactor and a specimen holder allowing cyclic anaerobic transfer between the reactor and microscope were used for the study. The number of atoms in a nascent cluster can be determined along with the general shape of the cluster. Reduction experiments without air exposure of the sample showed that although clusters are formed at 500 °C, many Pt atoms are not associated with the cluster and are still dispersed on the catalyst support. After a 700 °C reduction, all of the Pt atoms are associated with the clusters. Movement of the clusters on the catalyst support is different depending upon the catalyst support. Graphical Abstract: Aberration-corrected scanning transmission electron microscopy at the sub-Ångström resolution allows imaging the structure of catalytic materials at the single atom level and permits fundamental studies of the behavior of heavy metal catalytic species as a result of elevated temperature gas-treatments. The present study is aimed at understanding the development of clusters and nanoparticles of Pt on γ-alumina during reduction treatments of a pre-oxidized highly dispersed catalyst. A special built ex situ reactor and a specimen holder allowing cyclic anaerobic transfer between the reactor and microscope were used for the study. The number of atoms in a nascent cluster can be determined along with the general shape of the cluster. Reduction experiments without air exposure of the sample showed that although clusters are formed at 500 °C, many Pt atoms are not associated with the cluster and are still dispersed on the catalyst support. After a 700 °C reduction, all of the Pt atoms are associated with the clusters. Movement of the clusters on the catalyst support is different depending upon the catalyst support.[Figure not available: see fulltext.] © 2011 Springer Science+Business Media, LLC.
@article{ Bradley2012176,
author = {Bradley, S.A.a and Sinkler, W.a and Blom, D.A.b and Bigelow, W.c and Voyles, P.M.d and Allard, L.F.e },
title = {Behavior of Pt atoms on oxide supports during reduction treatments at elevated temperatures, characterized by aberration corrected stem imaging},
journal = {Catalysis Letters},
year = {2012},
volume = {142},
number = {2},
pages = {176-182},
doi = {10.1007/s10562-011-0756-2},
note = {cited By 8},
url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84856591939&partnerID=40&md5=6c7b5144a5ab4ec62f0f4952206b2cbc},
affiliation = {UOP, LLC A Honeywell Company, Des Plaines, IL, United States; EM Center, University of South Carolina, Columbia, SC, United States; Materials Science and Engineering, University of Michigan, Ann Arbor, MI, United States; Materials Science and Engineering, University of Wisconsin - Madison, Madison, WI, United States; Oak Ridge National Laboratory, Oak Ridge, TN, United States},
abstract = {Aberration-corrected scanning transmission electron microscopy at the sub-Ångström resolution allows imaging the structure of catalytic materials at the single atom level and permits fundamental studies of the behavior of heavy metal catalytic species as a result of elevated temperature gas-treatments. The present study is aimed at understanding the development of clusters and nanoparticles of Pt on γ-alumina during reduction treatments of a pre-oxidized highly dispersed catalyst. A special built ex situ reactor and a specimen holder allowing cyclic anaerobic transfer between the reactor and microscope were used for the study. The number of atoms in a nascent cluster can be determined along with the general shape of the cluster. Reduction experiments without air exposure of the sample showed that although clusters are formed at 500 °C, many Pt atoms are not associated with the cluster and are still dispersed on the catalyst support. After a 700 °C reduction, all of the Pt atoms are associated with the clusters. Movement of the clusters on the catalyst support is different depending upon the catalyst support. Graphical Abstract: Aberration-corrected scanning transmission electron microscopy at the sub-Ångström resolution allows imaging the structure of catalytic materials at the single atom level and permits fundamental studies of the behavior of heavy metal catalytic species as a result of elevated temperature gas-treatments. The present study is aimed at understanding the development of clusters and nanoparticles of Pt on γ-alumina during reduction treatments of a pre-oxidized highly dispersed catalyst. A special built ex situ reactor and a specimen holder allowing cyclic anaerobic transfer between the reactor and microscope were used for the study. The number of atoms in a nascent cluster can be determined along with the general shape of the cluster. Reduction experiments without air exposure of the sample showed that although clusters are formed at 500 °C, many Pt atoms are not associated with the cluster and are still dispersed on the catalyst support. After a 700 °C reduction, all of the Pt atoms are associated with the clusters. Movement of the clusters on the catalyst support is different depending upon the catalyst support.[Figure not available: see fulltext.] © 2011 Springer Science+Business Media, LLC.},
author_keywords = {Aberration-corrected electron microscopy; High-angle annular dark-field microscopy; Metal support interaction; Scanning transmission electron microscopy},
document_type = {Article},
source = {Scopus}
}
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The number of atoms in a nascent cluster can be determined along with the general shape of the cluster. Reduction experiments without air exposure of the sample showed that although clusters are formed at 500 °C, many Pt atoms are not associated with the cluster and are still dispersed on the catalyst support. After a 700 °C reduction, all of the Pt atoms are associated with the clusters. Movement of the clusters on the catalyst support is different depending upon the catalyst support. Graphical Abstract: Aberration-corrected scanning transmission electron microscopy at the sub-Ångström resolution allows imaging the structure of catalytic materials at the single atom level and permits fundamental studies of the behavior of heavy metal catalytic species as a result of elevated temperature gas-treatments. The present study is aimed at understanding the development of clusters and nanoparticles of Pt on γ-alumina during reduction treatments of a pre-oxidized highly dispersed catalyst. A special built ex situ reactor and a specimen holder allowing cyclic anaerobic transfer between the reactor and microscope were used for the study. The number of atoms in a nascent cluster can be determined along with the general shape of the cluster. Reduction experiments without air exposure of the sample showed that although clusters are formed at 500 °C, many Pt atoms are not associated with the cluster and are still dispersed on the catalyst support. After a 700 °C reduction, all of the Pt atoms are associated with the clusters. Movement of the clusters on the catalyst support is different depending upon the catalyst support.[Figure not available: see fulltext.] © 2011 Springer Science+Business Media, LLC.","affiliation":"UOP, LLC A Honeywell Company, Des Plaines, IL, United States; EM Center, University of South Carolina, Columbia, SC, United States; Materials Science and Engineering, University of Michigan, Ann Arbor, MI, United States; Materials Science and Engineering, University of Wisconsin - Madison, Madison, WI, United States; Oak Ridge National Laboratory, Oak Ridge, TN, United States","author":["Bradley, S.A.a","Sinkler, W.a","Blom, D.A.b","Bigelow, W.c","Voyles, P.M.d","Allard, L.F.e"],"author_keywords":"Aberration-corrected electron microscopy; High-angle annular dark-field microscopy; Metal support interaction; Scanning transmission electron microscopy","author_short":["Bradley, S.","Sinkler, W.","Blom, D.","Bigelow, W.","Voyles, P.","Allard, L."],"bibtex":"@article{ Bradley2012176,\n author = {Bradley, S.A.a and Sinkler, W.a and Blom, D.A.b and Bigelow, W.c and Voyles, P.M.d and Allard, L.F.e },\n title = {Behavior of Pt atoms on oxide supports during reduction treatments at elevated temperatures, characterized by aberration corrected stem imaging},\n journal = {Catalysis Letters},\n year = {2012},\n volume = {142},\n number = {2},\n pages = {176-182},\n doi = {10.1007/s10562-011-0756-2},\n note = {cited By 8},\n url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84856591939&partnerID=40&md5=6c7b5144a5ab4ec62f0f4952206b2cbc},\n affiliation = {UOP, LLC A Honeywell Company, Des Plaines, IL, United States; EM Center, University of South Carolina, Columbia, SC, United States; Materials Science and Engineering, University of Michigan, Ann Arbor, MI, United States; Materials Science and Engineering, University of Wisconsin - Madison, Madison, WI, United States; Oak Ridge National Laboratory, Oak Ridge, TN, United States},\n abstract = {Aberration-corrected scanning transmission electron microscopy at the sub-Ångström resolution allows imaging the structure of catalytic materials at the single atom level and permits fundamental studies of the behavior of heavy metal catalytic species as a result of elevated temperature gas-treatments. 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Graphical Abstract: Aberration-corrected scanning transmission electron microscopy at the sub-Ångström resolution allows imaging the structure of catalytic materials at the single atom level and permits fundamental studies of the behavior of heavy metal catalytic species as a result of elevated temperature gas-treatments. The present study is aimed at understanding the development of clusters and nanoparticles of Pt on γ-alumina during reduction treatments of a pre-oxidized highly dispersed catalyst. A special built ex situ reactor and a specimen holder allowing cyclic anaerobic transfer between the reactor and microscope were used for the study. The number of atoms in a nascent cluster can be determined along with the general shape of the cluster. Reduction experiments without air exposure of the sample showed that although clusters are formed at 500 °C, many Pt atoms are not associated with the cluster and are still dispersed on the catalyst support. After a 700 °C reduction, all of the Pt atoms are associated with the clusters. 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