Polymer-Induced Selectivity Enhancement in the Hydrogenation of 2-Hexyne Catalyzed by Poly(vinylpyrrolidone)-Stabilized Platinum Colloids in an Amorphous Mixed Metal Oxide Support
Polymer-Induced Selectivity Enhancement in the Hydrogenation of 2-Hexyne Catalyzed by Poly(vinylpyrrolidone)-Stabilized Platinum Colloids in an Amorphous Mixed Metal Oxide Support
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无定形混合金属氧化物载体中聚（乙烯基吡咯烷酮）稳定的铂胶体催化的 2-己炔氢化中聚合物诱导的选择性增强
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
W. Maier
中科院分区：
文献类型：
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作者：
Christian Lange;D. Caro;A. Gamez;S. Storck;†. A. J. S. Bradley;W. Maier
采用改进的−-−凝胶法将聚乙烯吡咯烷酮(PVP)稳定的铂纳米团簇(平均粒径为1.4 nm)包埋在非晶态微孔二氧化钛-二氧化硅混合氧化物(AMM-MeSi30Ti)中。透射电子显微镜观察表明，铂颗粒的平均直径基本保持不变。在间歇反应器中考察了含铂胶体的二氧化钛−二氧化硅复合氧化物催化剂对2-己烯在正庚烷和正丙醇中1bar加氢的催化活性。对顺式/反式-2-己烯的选择性高于分散在液相中的PVP稳定胶体。在PVP稳定的催化剂的丙醇胶体分散体中，当己炔转化率达到50%时，2-己烯的初始选择性为80%，转化率为94%；在完全转化时，2-己烯的选择性为88%(顺式-2-己烯选择性为91%).
Poly(vinylpyrrolidone) (PVP)-stabilized Pt clusters (1.4 nm average particle size) were embedded in an amorphous microporous titania−silica mixed oxide (AMM-MeSi30Ti) by means of a modified sol−gel procedure. The Pt particles were shown by transmission electron microscopy to retain their approximate original average diameter. The catalytic activity of the Pt-colloid-containing titania−silica mixed oxide catalysts was tested with the hydrogenation of 2-hexyne at 1 bar in decane or 1-propanol in a batch reactor. Selectivities to cis/trans-2-hexene were higher than those for PVP-stabilized colloids dispersed in the liquid phase. In colloidal dispersions of the PVP-stabilized catalyst in propanol, an initial 2-hexene selectivity of 80% at a conversion of 94% was observed at hexyne conversions up to 50%, and at complete conversion a selectivity to 2-hexenes of 88% was achieved (cis-2-hexene selectivity of 91%)....