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Vanadium oxide monolayer catalysts. I. Preparation, characterization, and thermal stability
Author(s) -
Roozeboom F.,
Fransen T.,
Mars P.,
Gellings P. J.
Publication year - 1979
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19794490102
Subject(s) - monolayer , chemisorption , vanadium oxide , catalysis , inorganic chemistry , oxide , thermal stability , vanadium , ternary operation , transition metal , materials science , chemistry , ionic bonding , ion , nanotechnology , organic chemistry , computer science , programming language
Vanadium oxide catalysts of the monolayer type have been prepared by means of chemisorption of vanadate(V)‐anions from aqueous solutions and by chemisorption of gaseous V 2 O 3 (OH) 4 . Using Al 2 O 3 , Cr 2 O 3 , TiO 2 , CeO 2 and ZrO 2 , catalysts with an approximately complete monomolecular layer of vanadium(V) oxide on the carrier oxides can be prepared, if temperature is not too high. Divalent metal oxides like CdO and ZnO may already form threedimensional surface vanadates at moderate temperature. The thermal stability of a monolayer catalyst is related to the parameter z/a, i. e. the ratio of the carrier cation charge to the sum of ionic radii of carrier cation and oxide anion. Thus, monolayer catalysts will be thermally stable only under the condition that z/a is not too high (aggregated catalyst) nor too small (ternary compound formation).