FORMATION, REACTIVITY AND CATALYTIC ACTIVITY SELECTIVITY OF PT(CLX)(CONH)Y SPECIES PREPARED BY INTERACTION OF H2PTCL6 WITH NYLON SUPPORTS

被引:5
作者
SERMON, PA
AZHARI, CH
机构
[1] Department of Chemistry, Brunei University, Uxbridge
来源
JOURNAL OF MOLECULAR CATALYSIS | 1990年 / 59卷 / 02期
关键词
D O I
10.1016/0304-5102(90)85057-O
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
Samples of platinum supported on nylon-66 have been prepared by the adsorption of hexachloroplatinic acid from aqueous solution and characterised. After reduction these catalysts were selective in the hydrogenation of benzene (373 - 493 K, H2:hydrocarbon = 18) to cyclohexene rather than cyclohexane, while in the hydrogenation of cyclohexene (373 - 453 K, H2: hydrocarbon = 214) the samples were active without simultaneous disproportionation. Such selectivity was greatest for Pt/nylon with highest Pt loading. Apparent turnover numbers for both reactions on Pt were low (possibly reflecting the difficulty of assessing the active surface areas of these catalysts). Activation energies for both reactions suggest the importance of reactant product diffusion into the porous support. Since the active species (i.e. -NH⋯ PtClx⋯CO-, where x remains uncertain)are thought to be coordinatively bonded to support amide groups, it is an important finding that Pt in a positive oxidation state is active in these reactions. © 1990.
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页码:267 / 277
页数:11
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