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首页> 外文期刊>Catalysis science & technology >Synergistic effect of Mo-W carbides on selective hydrodeoxygenation of guaiacol to oxygen-free aromatic hydrocarbons
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Synergistic effect of Mo-W carbides on selective hydrodeoxygenation of guaiacol to oxygen-free aromatic hydrocarbons

机译：协同Mo-W碳化物对选择性的影响hydrodeoxygenation愈创木酚氧芳烃

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摘要

Mo-W carbide was synthesized via temperature-programmed reduction to generate a -Mo2C phase with bulk morphology. The catalyst was characterized using X-ray diffraction (XRD), N-2 physisorption, X-ray photoelectron spectroscopy (XPS), H-2-chemisorption, and ammonia temperature programmed desorption (NH3-TPD) to investigate the synergistic effect of the combination of molybdenum and tungsten in carbide. Due to the interaction of Mo-W, the bimetallic carbide exhibited a significantly higher density of H-2-activating sites than the corresponding monometallic carbides prepared using the same method. In the HDO of guaiacol at 350 degrees C, MoWC exhibited the highest hydrodeoxygenation (HDO) activity and produced completely deoxygenated products with a selectivity of 92 mol% in which the benzene selectivity was approximate to 70 mol%. The superior catalytic activity is attributed to the presence of H-2-activating sites and oxophilic sites. Under the testing conditions, the HDO of guaiacol over monometallic molybdenum carbide followed both direct deoxygenation (DDO) and hydrogenation-dehydration (HYD) pathways, while MoWC strongly favored the DDO route. Over 8 h on stream, the catalyst still retained a high catalytic stability.
机译：Mo-W碳化合成通过程序升温还原生成-Mo2C阶段批量形态。特点是使用x射线衍射(XRD),n -物理吸附、x射线光电子能谱(XPS)、H-2-chemisorption和氨程序升温解吸(NH3-TPD)调查协同效应钼和钨硬质合金。双金属硬质合金表现出显著更高的密度比H-2-activating网站准备相应的使用单金属的碳化物使用相同的方法。350摄氏度,MoWC表现出最高的hydrodeoxygenation (HDO)活动和生产完全缺氧与产品92摩尔%的苯的选择性选择性是70摩尔%的近似。优越的催化活性是由于H-2-activating网站和oxophilic的存在网站。愈创木酚单矿物碳化钼之后直接脱氧(DDO)和hydrogenation-dehydration(海德拉巴)通路,而MoWC强烈赞成DDO路线。流,催化剂仍然保留一个高催化稳定性。

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