On the reactivity of K2O-, CaO- and P2O5-doped nickel molybdate catalysts in a periodic-flow reactor

被引：13

作者：

Kaddouri, A ^{[1
]}

Del Rosso, R ^{[1
]}

Mazzocchia, C ^{[1
]}

Gronchi, P ^{[1
]}

Céntola, P ^{[1
]}

机构：

[1] Politecn Milan, Dept Chem Engn & Ind Chem, I-20133 Milan, Italy

来源：

CATALYSIS LETTERS | 1999年 / 63卷 / 1-2期

关键词：

propane ODH; periodic-flow reactor; NiMoO4; promoters; acid-base; reducibility;

D O I：

10.1023/A:1019036114414

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：

The propane oxydehydrogenation with monolayer lattice oxygen of undoped and K2O-, CaO- and P2O5-NiMoO4 was investigated by using a periodic-flow reactor (PFR). The influence of the nature and the extent of the promoter has been emphasized relative to the doped catalysts with respect to pure NiMoO4 phases. It was observed that calcium and potassium promoters satisfactorily enhance propylene selectivity, and phosphorus promoter specifically increases the total activity while maintaining the propylene selectivity. Evidence found by thermogravimetric (TG) analyses (oxygen depletion rate) has shown a dependence on lattice oxygen mobility due to the presence of promoters. This dependence has been correlated to the propane conversion while the propylene selectivity was attributed to the acid-base properties.

引用

页码：65 / 71

页数：7

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