XPS and TPR studies of nitrided molybdena-alumina

Journal Article · Thu Mar 09 04:00:00 EST 2000 · Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical

DOI:https://doi.org/10.1021/jp993631s· OSTI ID:20026908

Hada, Kenichiro; Nagai, Masatoshi; Omi, Shinzo

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.

• Research Organization: Tokyo Univ. of Agriculture and Technology (JP)
• OSTI ID: 20026908
• Journal Information: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Journal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical Journal Issue: 9 Vol. 104; ISSN 1089-5647; ISSN JPCBFK
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
03 NATURAL GAS
ALUMINIUM OXIDES
CATALYSTS
DENITRIFICATION
DESORPTION
DESULFURIZATION
MOLYBDENUM CARBIDES
MOLYBDENUM NITRIDES
MOLYBDENUM OXIDES
X-RAY SPECTROSCOPY