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In situ laser raman spectroscopy during sequential oxidizing and reducing conditions for a vanadium‐phosphorous‐oxide catalyst
Author(s) -
Soejarto A. D.,
Schrader G. L.,
Coulston G. W.
Publication year - 1996
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450740507
Subject(s) - oxidizing agent , raman spectroscopy , maleic anhydride , vanadium , butane , catalysis , oxidation state , materials science , reducing agent , vanadium oxide , inorganic chemistry , analytical chemistry (journal) , oxide , chemistry , organic chemistry , metallurgy , optics , physics , copolymer , polymer
A VPO catalyst prepared in an organic medium has been studied by in situ laser Raman spectroscopy for n ‐butane oxidation to maleic anhydride. Data could be obtained at low laser power and brief collection times. Raman characterization during continuous flow (steady‐state) studies revealed that (VO) 2 P 2 O 7 was present. Sequential oxidizing (10% O 2 in N 2 ) and reducing (2% n ‐butane in N 2 ) conditions were explored at 350°C and 400°C. These cycling (unsteady‐state) operations revealed that formation of V(5 + ) phases was enhanced during oxidizing conditions. The intensity of Raman bands due to (VO) 2 P 2 O 7 increased during reducing conditions.