The hydrodeoxygenation (HDO) of 2-methoxyphenol (or guaiacol, GUA) over Pd, Ru, and Mo₂C catalysts supported on activated carbon (AC) is compared. The activities of the catalysts for hydrogenation versus deoxygenation on a per site basis, measured over a range of temperatures in a liquid phase batch reactor at high H₂ pressure (3.4 MPa), are quantified using lumped kinetics. The overall GUA consumption rate decreases in the order Pd > Ru > Mo₂C. Hydrogenation of the phenyl ring of GUA occurs at a low temperature (240 °C) on both the Pd/AC and Ru/AC catalysts. At a higher temperature (≥300 °C), the R–OCH₃ and R–OH bonds of the hydrogenated products are cleaved yielding cyclohexanol, cyclohexane (Pd and Ru), and benzene (Ru) as major products. On the Mo₂C/AC catalyst, HDO of GUA occurs by direct demethoxylation yielding phenol followed by Ar–OH bond cleavage to ultimately yield benzene at high temperatures. The lumped kinetics indicate that the hydrogenation activity of the Pd catalyst (on a per site basis, as determined from CO uptake measurements) is about 6 times higher than the Ru, but Ru is more active for O removal. Although the Mo₂C is the least active, it is the most efficient in terms of O-removal with minimal H₂ consumption.

中文翻译：

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碳负载Ru，Pd和Mo ₂ C催化剂上2-甲氧基苯酚的加氢脱氧

比较了在活性炭（AC）上负载的Pd，Ru和Mo ₂ C催化剂上2-甲氧基苯酚（或guaiacol，GUA）的加氢脱氧（HDO）。使用集总动力学对在高H ₂压力（3.4 MPa）下在液相间歇反应器中在一定温度范围内测得的每位置上氢化和脱氧催化剂的活性进行定量。GUA的总消耗速率按Pd> Ru> Mo ₂ C的顺序降低。GUA的苯环加氢在低温（240°C）的Pd / AC和Ru / AC催化剂上进行。在较高温度（≥300°C）下，R–OCH ₃氢化产物的R-OH键断裂，产生环己醇，环己烷（Pd和Ru）和苯（Ru）作为主要产物。在Mo ₂ C / AC催化剂上，GUA的HDO通过直接脱甲氧基化生成苯酚，然后进行Ar-OH键断裂而最终在高温下生成苯。集总动力学表明，Pd催化剂的加氢活性（基于每个位点，由CO吸收测量确定）比Ru高约6倍，但Ru对除O的活性更高。尽管Mo ₂ C的活性最低，但在O去除方面最有效，而H _2的消耗却最少。