Rates of C₃-C₅ ketone hydrogenation are measured in the vapor phase over Ru/SiO₂. Reaction kinetics are considered through a range of ketone partial pressures (0.3–30Torr), hydrogen partial pressures (90–900Torr), and reaction temperatures (322–456K). Ketone hydrogenation is observed to be facile, with site time yields ranging from 0.14s⁻¹ for 2-pentanone to 0.37s⁻¹ for acetone at 322K and 1.2 bar H₂. At low temperatures, apparent reaction orders and kinetic barriers are similar for all ketones. During acetone hydrogenation at higher temperatures, (422K), the ketone order increases from 0 to 0.4, while the hydrogen order increases from 0.5 to 0.9. Furthermore, the apparent barrier decreases from ≈50kJmol⁻¹ at 322K to ≈18kJmol⁻¹. Apparent trends in hydrogenation rates are interpreted at an elementary level using a microkinetic analysis that is based on a Horiuti-Polanyi mechanism involving two distinct surface sites.

中文翻译：

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负载型Ru催化剂上C3-C5酮加氢的动力学分析

在Ru / SiO _2上在气相中测量C ₃ -C ₅酮氢化的速率。通过一系列的酮分压（0.3–30Torr），氢分压（90–900Torr）和反应温度（322–456K）来考虑反应动力学。观察到酮氢化很容易，在322K和1.2 bar H _2下，位点时间产率范围从2-戊酮的0.14s ^-1到丙酮的0.37s ^-1。在低温下，所有酮的表观反应阶数和动力学垒均相似。在较高温度（422K）下的丙酮加氢过程中，酮级从0增加到0.4，而氢级从0.5增加到0.9。此外，明显的阻挡从≈50kJmol减小^-1在322K到≈18kJmol ^-1。使用基于包括两个不同表面位点的Horiuti-Polanyi机理的微动力学分析，可以在基本水平上解释氢化速率的明显趋势。