An FFIR study of the dispersed Ni species on Ni-YSZ catalysts

被引：29

作者：

Resini, Carlo ^{[1
,2
]}

Venkov, Tzvetomir ^{[3
]}

Hadjiivanov, Konstantin ^{[3
]}

Presto, Sabrina ^{[2
,4
]}

Riani, Paola ^{[2
,4
]}

Marazza, Rinaldo ^{[2
,4
]}

Ramis, Gianguido ^{[1
,2
]}

Busca, Guido ^{[1
,2
]}

机构：

[1] Univ Geneva, Dipartimento Ingn Chim & Proc, I-16129 Genoa, Italy

[2] Consorzio INSTM, I-50132 Florence, Italy

[3] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria

[4] Univ Genoa, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy

来源：

APPLIED CATALYSIS A-GENERAL | 2009年 / 353卷 / 01期

关键词：

Ni catalysts; Zirconia support; Yttria-stabilized zirconia; IR spectroscopy; CO adsorption; NO adsorption; Ethanol steam reforming; Steam reforming; Reduction; Reducibility; HYDROGEN-PRODUCTION; CO ADSORPTION; ZIRCONIA; ETHANOL; NICKEL; IR; METHANATION; CHEMISTRY; NI(111); OXIDES;

D O I：

10.1016/j.apcata.2008.10.042

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

IR spectroscopy of low temperature adsorbed CO and CO + NO has been used to characterize the Surface species on a 5% Ni-YSZ catalyst. Dispersed surface Ni species are present on the fresh catalyst, essentially formed by Ni2+, although it is evident that these species are very easily reduced in very mild conditions to zerovalent atomic nickel. Reduction in stronger conditions gives rise to small Ni metal particles, which are however easily reoxidized to bivalent nickel. This work has demonstrated how elastic is the redox state of this catalyst. This is supposed to be a key properties explaining the behaviour of this catalyst in converting ethanol in the presence of water. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：137 / 143

页数：7

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