Title of article
Reactivity of nanocrystalline copper oxide and its modification under magnetic field
Author/Authors
Yermakov، نويسنده , , A.Ye. and Feduschak، نويسنده , , T.A. and Uimin، نويسنده , , M.A. and Mysik، نويسنده , , A.A. and Gaviko، نويسنده , , V.S. and Chupakhin، نويسنده , , O.N. and Shishmakov، نويسنده , , A.B. and Kharchuk، نويسنده , , V.G. and Petrov، نويسنده , , L.A. and Kotov، نويسنده , , Y.A. and Vosmerikov، نويسنده , , A.V. and Korolyov، نويسنده , , A.V.، نويسنده ,
Issue Information
هفته نامه با شماره پیاپی سال 2004
Pages
7
From page
317
To page
323
Abstract
The influence of magnetic field on the rate of oxidative dehydrogenation of 2,3,5-trimetyl-1,4-hydroquinone (TMHQ) to 2,3,5-trimetyl-1,4-benzoquinone (TMBQ) with catalysts based on copper oxide nanopowders has been investigated. The initial transformation rate of TMHQ and the final product yield greatly increase after a preliminary magnetization of nanopowders. The adsorption ability of Cu-oxide-based nanopowders with respect to ammonia enhances by 1.5 after their magnetization. Physical mechanism of reactivity variation of CuO nanopowders under the influence of weak stationary external magnetic field (H≤3 kOe) has been proposed. As a result of magnetic field influence, the ferromagnetic regions with modified spin and charge state have appeared in an antiferromagnetic CuO of nonstoichiometric composition. These regions can be new catalytic or adsorption centers.
Keywords
Reactivity , Reaction Rate , Magneto-controlled catalyst and adsorbent , Nanoparticles , Charge phase separation
Journal title
Solid State Ionics
Serial Year
2004
Journal title
Solid State Ionics
Record number
1716598
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