INFLUENCE OF THE REDUCTION TEMPERATURE ON THE CHARACTERISTICS OF THE METALLIC PHASE OF PT-GE/AL2O3 CATALYSTS

被引:21
作者
DEMIGUEL, SR [1 ]
CORREA, JAM [1 ]
BARONETTI, GT [1 ]
CASTRO, AA [1 ]
SCELZA, OA [1 ]
机构
[1] INST INVEST CATALYSIS & PETROQUIM, SANTIAGO ESTERO 2654, RA-3000 SANTA FE, ARGENTINA
来源
APPLIED CATALYSIS | 1990年 / 60卷 / 01期
关键词
catalyst characterization (TPR; hydrogen chemisorption); naphta reforming; platinum-germanium/alumina;
D O I
10.1016/S0166-9834(00)82171-5
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 state of the metallic phase of Pt-Ge (0.3-0.3 wt.-%) /Al2O3 catalysts prepared by different deposition sequences of the metallic precursors (H2PtCl6 and GeCl4) was studied by temperature programmed reduction (TPR), hydrogen chemisorption and various test reactions. The characteristics of the metallic phase do not depend on the deposition sequence used for the catalyst preparation. At reduction temperatures lower than 350°C, germanium species placed near platinum atoms provide only a geometric effect, but at higher reduction temperatures, germanium, which is mainly in the zerovalent state, modifies the electronic properties of platinum with probably alloys formation. Studies on the acidic function of Pt/Al2O3, Ge/Al2O3 and Pt-Ge/Al2O3 catalysts indicate that the acidic strength distribution of γ-Al2O3 is not modified by the addition of platinum, germanium or platinum and germanium. © 1990.
引用
收藏
页码:47 / 59
页数:13
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