Comparative study of supported catalyst particles by electron microscopy methods

Ming Hui Yao, David Smith, Abhaya K. Datye

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

High-resolution transmission electron microscopy, high-resolution scanning electron microscopy and high-angle annular dark-field imaging were used to study the size distribution and surface structures of Pt model catalysts on various oxide supports. The relative merits of different electron microscopy methods for catalyst research were evaluated by comparing images recorded with microscopes of different type. It was concluded that HRTEM profile imaging was the most effective technique for direct observation of microstructure, especially the surface structure of supported particles, while HRSEM and HAADF, respectively, were preferred for characterizing the surface topology of catalyst supports and the size distribution of supported particles. Using profile imaging, crystalline monolayers caused by high-temperature reduction on {111} surfaces of Pt/TiO2 could be recorded with atomic resolution. These overlayers help explain the drop in chemisorption ability due to high-temperature reduction, a phenomenon usually referred to as strong metal-support interaction. HRSEM showed the presence of surface steps on model TiO2 and a concentration of larger Pt particles on these steps.

Original languageEnglish (US)
Pages (from-to)282-288
Number of pages7
JournalUltramicroscopy
Volume52
Issue number3-4
DOIs
StatePublished - 1993

Fingerprint

Catalyst supports
Electron microscopy
electron microscopy
Imaging techniques
catalysts
Surface structure
Catalysts
High resolution electron microscopy
Chemisorption
High resolution transmission electron microscopy
Oxides
Monolayers
Microscopes
Metals
Topology
Crystalline materials
high resolution
Temperature
profiles
Microstructure

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation

Cite this

Comparative study of supported catalyst particles by electron microscopy methods. / Yao, Ming Hui; Smith, David; Datye, Abhaya K.

In: Ultramicroscopy, Vol. 52, No. 3-4, 1993, p. 282-288.

Research output: Contribution to journalArticle

Yao, Ming Hui ; Smith, David ; Datye, Abhaya K. / Comparative study of supported catalyst particles by electron microscopy methods. In: Ultramicroscopy. 1993 ; Vol. 52, No. 3-4. pp. 282-288.
@article{21b2fe1ec20a4660a96a8ad035bb1eee,
title = "Comparative study of supported catalyst particles by electron microscopy methods",
abstract = "High-resolution transmission electron microscopy, high-resolution scanning electron microscopy and high-angle annular dark-field imaging were used to study the size distribution and surface structures of Pt model catalysts on various oxide supports. The relative merits of different electron microscopy methods for catalyst research were evaluated by comparing images recorded with microscopes of different type. It was concluded that HRTEM profile imaging was the most effective technique for direct observation of microstructure, especially the surface structure of supported particles, while HRSEM and HAADF, respectively, were preferred for characterizing the surface topology of catalyst supports and the size distribution of supported particles. Using profile imaging, crystalline monolayers caused by high-temperature reduction on {111} surfaces of Pt/TiO2 could be recorded with atomic resolution. These overlayers help explain the drop in chemisorption ability due to high-temperature reduction, a phenomenon usually referred to as strong metal-support interaction. HRSEM showed the presence of surface steps on model TiO2 and a concentration of larger Pt particles on these steps.",
author = "Yao, {Ming Hui} and David Smith and Datye, {Abhaya K.}",
year = "1993",
doi = "10.1016/0304-3991(93)90037-X",
language = "English (US)",
volume = "52",
pages = "282--288",
journal = "Ultramicroscopy",
issn = "0304-3991",
publisher = "Elsevier",
number = "3-4",

}

TY - JOUR

T1 - Comparative study of supported catalyst particles by electron microscopy methods

AU - Yao, Ming Hui

AU - Smith, David

AU - Datye, Abhaya K.

PY - 1993

Y1 - 1993

N2 - High-resolution transmission electron microscopy, high-resolution scanning electron microscopy and high-angle annular dark-field imaging were used to study the size distribution and surface structures of Pt model catalysts on various oxide supports. The relative merits of different electron microscopy methods for catalyst research were evaluated by comparing images recorded with microscopes of different type. It was concluded that HRTEM profile imaging was the most effective technique for direct observation of microstructure, especially the surface structure of supported particles, while HRSEM and HAADF, respectively, were preferred for characterizing the surface topology of catalyst supports and the size distribution of supported particles. Using profile imaging, crystalline monolayers caused by high-temperature reduction on {111} surfaces of Pt/TiO2 could be recorded with atomic resolution. These overlayers help explain the drop in chemisorption ability due to high-temperature reduction, a phenomenon usually referred to as strong metal-support interaction. HRSEM showed the presence of surface steps on model TiO2 and a concentration of larger Pt particles on these steps.

AB - High-resolution transmission electron microscopy, high-resolution scanning electron microscopy and high-angle annular dark-field imaging were used to study the size distribution and surface structures of Pt model catalysts on various oxide supports. The relative merits of different electron microscopy methods for catalyst research were evaluated by comparing images recorded with microscopes of different type. It was concluded that HRTEM profile imaging was the most effective technique for direct observation of microstructure, especially the surface structure of supported particles, while HRSEM and HAADF, respectively, were preferred for characterizing the surface topology of catalyst supports and the size distribution of supported particles. Using profile imaging, crystalline monolayers caused by high-temperature reduction on {111} surfaces of Pt/TiO2 could be recorded with atomic resolution. These overlayers help explain the drop in chemisorption ability due to high-temperature reduction, a phenomenon usually referred to as strong metal-support interaction. HRSEM showed the presence of surface steps on model TiO2 and a concentration of larger Pt particles on these steps.

UR - http://www.scopus.com/inward/record.url?scp=0027770666&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027770666&partnerID=8YFLogxK

U2 - 10.1016/0304-3991(93)90037-X

DO - 10.1016/0304-3991(93)90037-X

M3 - Article

AN - SCOPUS:0027770666

VL - 52

SP - 282

EP - 288

JO - Ultramicroscopy

JF - Ultramicroscopy

SN - 0304-3991

IS - 3-4

ER -