Hydrodeoxygenation of p-Cresol on MoS2/Amorphous Carbon Composites Synthesized by a One-Step Hydrothermal Method: The Effect of Water on Their Activity and Structure

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• 作者：Guohua Zhu ; Weiyan Wang ; Kui Wu ; Song Tan ; Liang Tan ; Yunquan Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：November 30, 2016
• 年：2016
• 卷：55
• 期：47
• 页码：12173-12182
• 全文大小：659K
• ISSN：1520-5045

文摘

Associated with the carbonization of glucose in the hydrothermal process, MoS₂/amorphous carbon composites were synthesized by a one-step hydrothermal method and characterized by various technologies. Introducing carbon into MoS₂ increased its surface area and enlarged the edge-to-corner ratio of the MoS₂ slab of the MoS₂ phase, which contributed to a high deoxygenation degree in the hydrodeoxygenation (HDO) of p-cresol, but excessive carbon covered some MoS₂ edges that acted as active sites for HDO reaction and lowered the conversion. The presence of water modified the surface structure of MoS₂ and had a great effect on the HDO activity and product distribution. During the HDO reaction, sulfur–oxygen exchange at the edges of MoS₂ resulted in the loss of S atoms and the intensity decrease of the (002) diffraction peak for MoS₂ phase, which was accelerated by increasing the amount of added water. Carbon in MoS₂ only acted as a support and had no preventing effect on water. When the added water was 0.2 g, i.e., water/p-cresol molar ratio was 0.5:1, after reaction at 275 °C for 8 h, toluene selectivity and deoxygenation degree increased to 91.3% and 94.2%, respectively.