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Hydrodeoxygenation of guaiacol over Ni/carbon catalysts: effect of the support and Ni loading

机译：镍/碳催化剂上愈创木酚的加氢脱氧：载体和镍负载量的影响

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Commercial carbon nanotubes (CNT), oxidized CNT (CNTox) and activated carbon (AC) were used as supports to prepare Ni/C catalysts with a nominal loading of 15 wt%. In addition, xNi/CNT catalysts with loadings of x: 10, 12, 15, 17, 20 wt% were prepared. The catalysts were characterized by N-2 physisorption, temperature-programmed decomposition (TPD), potentiometric titration, H-2-temperature programmed reduction (TPR), CO chemisorption and X-ray photoelectron spectroscopy (XPS). The catalysts were evaluated for the conversion of guaiacol at 573 K and 5 MPa H-2 pressure for 4 h in a batch reactor. The activity of the xNi/CNT catalysts was related to Ni dispersion, while their selectivity was similar and favored the formation of hydrogenation products. The activity of 15Ni/CNT catalyst was higher than those of 15Ni/CNTox and 15Ni/AC catalysts. The higher activity of the 15Ni/CNT catalyst compared to 15Ni/AC catalyst was possibly due to their different morphologies, while the lower activity of the 15Ni/CNTox catalyst was attributed to the limiting effect of surface oxygen groups on the support. In addition, the higher acidity of the 15Ni/CNTox catalyst enhanced its hydrogenolysis and deoxygenation capacities.
机译：使用商业碳纳米管（CNT），氧化的CNT（CNTox）和活性炭（AC）作为载体来制备标称载量为15 wt％的Ni / C催化剂。另外，制备了xNi / CNT催化剂，其负载量为x：10、12、15、17、20wt％。催化剂的特征在于N-2物理吸附，程序升温分解（TPD），电位滴定，H-2-程序升温还原（TPR），CO化学吸附和X射线光电子能谱（XPS）。在间歇反应器中评估催化剂在573 K和5 MPa H-2压力下4小时的愈创木酚转化率。 xNi / CNT催化剂的活性与Ni的分散性有关，而它们的选择性相似并且有利于氢化产物的形成。 15Ni / CNT催化剂的活性高于15Ni / CNTox和15Ni / AC催化剂。与15Ni / AC催化剂相比，15Ni / CNT催化剂的较高活性可能是由于它们的形态不同，而15Ni / CNTox催化剂的较低活性归因于表面氧基团对载体的限制作用。另外，15Ni / CNTox催化剂的较高酸度增强了其氢解和脱氧能力。

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