A controllable transformation in copper valence states and its applications

ABSTRACTVia electrical property measurements (conductivity, thermopower) at 700°C on sinter-forged YBa Cu O, it was YBa2Cu3O7−x, it was determined that conduction occurs via small polaron conduction in the tetragonal phase. From the thermopower and oxygen content the distribution of copper valence states was determined.

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Studies of copper valence states with CuL3x-ray-absorption spectroscopy

Physical Review B ◽

10.1103/physrevb.39.1541 ◽

1989 ◽

Vol 39 (3) ◽

pp. 1541-1545 ◽

Cited By ~ 202

Author(s):

M. Grioni ◽

J. B. Goedkoop ◽

R. Schoorl ◽

F. M. F. de Groot ◽

J. C. Fuggle ◽

...

Keyword(s):

Absorption Spectroscopy ◽

Valence States ◽

Copper Valence

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Tailoring copper valence states in CuOδ/γ-Al2O3 catalysts by an in situ technique induced superior catalytic performance for simultaneous elimination of NO and CO

Physical Chemistry Chemical Physics ◽

10.1039/c3cp52493k ◽

2013 ◽

Vol 15 (36) ◽

pp. 14945 ◽

Cited By ~ 20

Author(s):

Xiaojiang Yao ◽

Fei Gao ◽

Yuan Cao ◽

Changjin Tang ◽

Yu Deng ◽

...

Keyword(s):

Catalytic Performance ◽

Valence States ◽

Copper Valence ◽

Simultaneous Elimination ◽

In Situ Technique

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A DFT and microkinetic study of propylene oxide selectivity over copper-based catalysts: effects of copper valence states

Catalysis Science & Technology ◽

10.1039/d0cy01611j ◽

2020 ◽

Vol 10 (22) ◽

pp. 7640-7651

Author(s):

Tian-Tian Xiao ◽

Gui-Chang Wang

Keyword(s):

Selective Oxidation ◽

Propylene Oxide ◽

High Performance ◽

Valence States ◽

Copper Valence ◽

Scientific Fields

The development of high-performance copper-based catalysts is critical for the selective oxidation of propylene in both technology and scientific fields.

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Valence state analysis of elements by EPMA and its application

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100134752 ◽

1990 ◽

Vol 48 (2) ◽

pp. 230-231

Author(s):

Chen Liqing ◽

Liu Zuqin ◽

Zhang Wei

Keyword(s):

Valence State ◽

Line Intensities ◽

Valence States ◽

Valence Electrons ◽

Fe And Mn ◽

Intensity Ratios ◽

State Analysis

Valence state analyses of Fe and Mn in oxides by EPMA have been reported in literature. In this paper, the effects of valence state on intensity ratios ILα/IKα and ILα/ILβ of Cu, Ni, Co, Fe, Mn, Cr and their oxides, and on intensity ratios ILβ2/ILα1 and ILγ1/ILα1 of Mo, Nb, Zr and their oxides were studied. It was observed that intensity ratios change with valence states in accordance with some regularities, and these effects could be utilized for analyzing the valence states of catalysts.Valence state analysis of elements by EPMA is based on the fact that changes in the states of valence electrons in the outer shells of an atom cause corresponding changes in line intensities. The M electrons of Cu, Ni, Co, Fe, Mn, Cr and the N electrons of Mo, Nb, Zr are valence electrons. Line Kα1,2 and six lines of L are produced from the transitions of K-L2,3 and L-M or L-N respectively.

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Valence states of O2 Feynman's way

Molecular Physics ◽

10.1080/00268979609482559 ◽

1996 ◽

Vol 89 (5) ◽

pp. 1577-1602 ◽

Cited By ~ 4

Author(s):

THOMAS SORENSEN ◽

WALTER ENGLAND

Keyword(s):

Valence States

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On definition of electronegativity within the framework of MO methods

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19821479 ◽

1982 ◽

Vol 47 (5) ◽

pp. 1479-1485 ◽

Cited By ~ 4

Author(s):

Robert Ponec

Keyword(s):

Valence States ◽

Cndo Approximation ◽

Definition Of

The possibility of generalization of the electronegativity concept to valence states of atom in molecule has been studied by semiempirical CNDO and INDO approximations. It is shown that the concept of electronegativity as the property of a given atom in molecule can be defined only on the basis of the simplest CNDO approximation.

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