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Title: XPS and TPR studies of nitrided molybdena-alumina

Abstract

The relationship between the surface molybdenum species and absorbed nitrogen species on nitrided 1.0-19.7% MoO{sub 3}/Al{sub 2}O{sub 3} was elucidated by XPS and temperature-programmed reduction (TPR). The MoO{sub 3}/Al{sub 2}O{sub 3} samples were nitrided by temperature-programmed reaction with NH{sub 3}. From the XPS analysis, Mo{sup 3+} and Mo{sup 4+} ions were predominant on the surface of the nitrided Mo/Al{sub 2}O{sub 3} samples. From the TPR measurement, the ammonia desorption was due to nitrogen species adsorbed on alumina. The nitrogen desorption was due to two kinds of nitrogen desorption from the structures of {gamma}-Mo{sub 2}N and {beta}-Mo{sub 2}N{sub 0.78} and four kinds of nitrogen desorption from NH{sub X} species adsorbed on MoO{sub 2}, Mo{sup 3+} ion ({gamma}-Mo{sub 2}N), Mo{sup 2}+ ion (molybdenum nitride on alumina such as highly dispersed molybdenum nitride), and alumina.

Authors:
; ;
Publication Date:
Research Org.:
Tokyo Univ. of Agriculture and Technology (JP)
OSTI Identifier:
20026908
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical
Additional Journal Information:
Journal Volume: 104; Journal Issue: 9; Other Information: PBD: 9 Mar 2000; Journal ID: ISSN 1089-5647
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 02 PETROLEUM; 03 NATURAL GAS; CATALYSTS; MOLYBDENUM OXIDES; ALUMINIUM OXIDES; DESULFURIZATION; MOLYBDENUM NITRIDES; MOLYBDENUM CARBIDES; X-RAY SPECTROSCOPY; DESORPTION; DENITRIFICATION

Citation Formats

Hada, Kenichiro, Nagai, Masatoshi, and Omi, Shinzo. XPS and TPR studies of nitrided molybdena-alumina. United States: N. p., 2000. Web. doi:10.1021/jp993631s.
Hada, Kenichiro, Nagai, Masatoshi, & Omi, Shinzo. XPS and TPR studies of nitrided molybdena-alumina. United States. doi:10.1021/jp993631s.
Hada, Kenichiro, Nagai, Masatoshi, and Omi, Shinzo. Thu . "XPS and TPR studies of nitrided molybdena-alumina". United States. doi:10.1021/jp993631s.
@article{osti_20026908,
title = {XPS and TPR studies of nitrided molybdena-alumina},
author = {Hada, Kenichiro and Nagai, Masatoshi and Omi, Shinzo},
abstractNote = {The relationship between the surface molybdenum species and absorbed nitrogen species on nitrided 1.0-19.7% MoO{sub 3}/Al{sub 2}O{sub 3} was elucidated by XPS and temperature-programmed reduction (TPR). The MoO{sub 3}/Al{sub 2}O{sub 3} samples were nitrided by temperature-programmed reaction with NH{sub 3}. From the XPS analysis, Mo{sup 3+} and Mo{sup 4+} ions were predominant on the surface of the nitrided Mo/Al{sub 2}O{sub 3} samples. From the TPR measurement, the ammonia desorption was due to nitrogen species adsorbed on alumina. The nitrogen desorption was due to two kinds of nitrogen desorption from the structures of {gamma}-Mo{sub 2}N and {beta}-Mo{sub 2}N{sub 0.78} and four kinds of nitrogen desorption from NH{sub X} species adsorbed on MoO{sub 2}, Mo{sup 3+} ion ({gamma}-Mo{sub 2}N), Mo{sup 2}+ ion (molybdenum nitride on alumina such as highly dispersed molybdenum nitride), and alumina.},
doi = {10.1021/jp993631s},
journal = {Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical},
issn = {1089-5647},
number = 9,
volume = 104,
place = {United States},
year = {2000},
month = {3}
}