Copper/Zinc oxide catalysts.: Part XII.: Solid solution formation in the CuO/ZnO system.: X-ray powder diffraction study

被引:7
作者
Cernák, J
Gérard, F
Kappenstein, C
Chomic, J
机构
[1] Safarik Univ, Inst Chem, Dept Inorgan Chem, Kosice 04154, Slovakia
[2] Univ Poitiers, UMR CNRS 6503, LACCO, F-86022 Poitiers, France
来源
MONATSHEFTE FUR CHEMIE | 2004年 / 135卷 / 09期
关键词
copper oxide; zinc oxide; solid solution; XRD; calcination;
D O I
10.1007/s00706-004-0205-7
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Coordination compounds Zn(ma1)(H(2)O)(2) (ZMH) (mal=maleate anion (C(2)H(2)(CO(2))(2)(2-))), Cu(0.06)Zn(0.94)(mal)(H(2)O)(2) (ZCMH), Cu(mal)(H(2)O) (CMH), and physical mixtures of CMH and ZMH were used as precursors for calcination experiments in air at 500 and 1000degreesC lasting 18 hours. The obtained oxides were investigated by X-ray powder diffraction technique. Calcination at 500degreesC yielded pure zincite phase (ZnO), tenorite phase (CuO), or their mixtures. The calcination of the Zn-rich sample ZCMH at 1000degreesC lead to zincite phase displaying a slightly lower cell volume than the pure zincite phase obtained from Zn-only containing precursor (ZMH). These results suggest that the assumed solid solution Cu(x)Zn(1-x)O (x=0.01-0.02) exhibits a solubility limit lower than the copper content in the ZCMH precursor (6 mol-%). On the other hand, the calcination of the Cu-rich samples at 1000degreesC, in the presence of Zn(II), yielded tenorite phase exhibiting cell parameters significantly different from those reported for the pure tenorite phase, due to the formation of Zn(0.03)Cu(0.97)O solid solutions. All these results are corroborated by intensity analysis of the diffraction peaks.
引用
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页码:1081 / 1088
页数:8
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