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Characterization of some perovskite oxides based on YBa 2 Cu 3 O 7 − x in relation to their use in methanol production
Author(s) -
Dursun G,
Winterbottom J M
Publication year - 2000
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/1097-4660(200011)75:11<997::aid-jctb280>3.0.co;2-n
Subject(s) - catalysis , methanol , materials science , methanation , temperature programmed reduction , perovskite (structure) , cobalt , atmospheric temperature range , inorganic chemistry , fischer–tropsch process , selectivity , autoclave , metal , chemistry , metallurgy , crystallography , organic chemistry , physics , meteorology
The oxidized and weakly reducible perovskite oxide YBa 2 Cu 3 O 7 − x (YBCO) has been prepared as a catalyst, supported on γ‐Al 2 O 3 . It was further modified by (i) impregnation with Ru and Pd and (ii) cobalt incorporation via co‐precipitation. All the catalysts were either 20% (w/w) YBCO/γ‐Al 2 O 3 or 2% (w/w) Ru, Pd or Co/20% (w/w) YBCO/γ‐Al 2 O 3 . The catalysts were characterized using temperature programmed reduction (TPR), surface area measurements and X‐ray diffraction (XRD) studies before and after various treatments. They were studied as catalysts in the pressure range 20–50 atmospheres and in the temperature range 523–573 K in an autoclave equipped with a spinning basket catalyst container. The Pd‐, Ru‐ and Co‐modified catalysts gave predominantly methanation products, along with some C 2 –C 4 hydrocarbons. However the YBCO/γ‐Al 2 O 3 catalyst exhibited significant methanol selectivity at 50 atmospheres and at 523 K X‐ray diffraction studies revealed the presence of Cu(0), Cu(I) and Cu(II) after reduction and the species Cu(0) and Cu(I) are probably essential to CH 3 OH production. © 2000 Society of Chemical Industry