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Title: An atomic force microscopy study of the morphological evolution of the MoO{sub 3} (010) surface during reduction reactions

Abstract

Atomic force microscopy was used to characterize the nanometerscale structural evolution of the MoO{sub 3} (010) surface during reaction with hydrogen at 400 C. Two primary surface modifications were identified. First, water vapor, when present in the reactor either as an impurity or as an oxidation product, accelerates the volatilization of MoO{sub 3} and leads to the formation of surface voids. The presence of these voids increases the density of (100) and (h01)-type surface sites on the basal planes. Second, oxygen removal leads to the formation of crystallographic shear plans. The intersection of these defects with the (010) surface creates 2 {angstrom} high steps along (001) and their presence indicates that the surface vacancy concentration has reached an upper limit. The mechanisms by which these structural changes might influence the reactivity of molybdenum oxide catalysts are discussed. 31 refs., 6 figs.

Authors:
;  [1]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States)
Publication Date:
OSTI Identifier:
508454
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 163; Journal Issue: 1; Other Information: PBD: 15 Sep 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MOLYBDENUM OXIDES; MICROSCOPY; REDUCTION; CATALYSTS

Citation Formats

Smith, R L, and Rohrer, G S. An atomic force microscopy study of the morphological evolution of the MoO{sub 3} (010) surface during reduction reactions. United States: N. p., 1996. Web. doi:10.1006/jcat.1996.0300.
Smith, R L, & Rohrer, G S. An atomic force microscopy study of the morphological evolution of the MoO{sub 3} (010) surface during reduction reactions. United States. doi:10.1006/jcat.1996.0300.
Smith, R L, and Rohrer, G S. Sun . "An atomic force microscopy study of the morphological evolution of the MoO{sub 3} (010) surface during reduction reactions". United States. doi:10.1006/jcat.1996.0300.
@article{osti_508454,
title = {An atomic force microscopy study of the morphological evolution of the MoO{sub 3} (010) surface during reduction reactions},
author = {Smith, R L and Rohrer, G S},
abstractNote = {Atomic force microscopy was used to characterize the nanometerscale structural evolution of the MoO{sub 3} (010) surface during reaction with hydrogen at 400 C. Two primary surface modifications were identified. First, water vapor, when present in the reactor either as an impurity or as an oxidation product, accelerates the volatilization of MoO{sub 3} and leads to the formation of surface voids. The presence of these voids increases the density of (100) and (h01)-type surface sites on the basal planes. Second, oxygen removal leads to the formation of crystallographic shear plans. The intersection of these defects with the (010) surface creates 2 {angstrom} high steps along (001) and their presence indicates that the surface vacancy concentration has reached an upper limit. The mechanisms by which these structural changes might influence the reactivity of molybdenum oxide catalysts are discussed. 31 refs., 6 figs.},
doi = {10.1006/jcat.1996.0300},
journal = {Journal of Catalysis},
number = 1,
volume = 163,
place = {United States},
year = {1996},
month = {9}
}