A comparison of MoS2 catalysts hydrothermally synthesized from different sulfur precursors in their morphology and hydrodeoxygenation activity
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摘要: 分别采用硫脲、L-胱氨酸和硫磺为硫源水热合成了三种MoS2催化剂，对其结构和形貌特征进行了表征，并以对甲酚为探针化合物，比较研究了三种MoS2的加氢脱氧（HDO）催化活性。结果表明，硫源对MoS2晶体结构的影响不大，但对其形貌和比表面积影响较大。与商业MoS2相比，所制备的MoS2催化剂都表现出更高的HDO活性；其中，以硫脲为原料合成的MoS2具有较高的比表面积和花状结构，其催化活性最高，在300℃下进行对甲酚的HDO反应，脱氧度可达99.3%。Abstract: Three MoS2 catalysts were synthesized by a hydrothermal method using different sulfur precursors such as thiourea, L-cystine and sulfur powder; their differences in the structure, morphology, and catalytic activity in the hydrodeoxygenation (HDO) of p-cresol were comparatively investigated. The results illustrated that the sulfur source has a significant influence on the morphology and surface area of the as-synthesized MoS2 catalysts. All the hydrothermally synthesized MoS2 catalysts show much higher activity in HDO than the commercial MoS2 sample. Among three MoS2 catalysts, the one prepared from thiourea, with a high surface area and flower-like morphology, exhibits the highest activity in HDO; over it, a deoxygenation degree of 99.3% is achieved at 300℃.
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Key words:
- MoS2 /
- hydrothermal synthesis /
- sulfur precursor /
- morphology /
- hydrodeoxygenation /
- p-cresol
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Figure 1 XRD patterns of MoS2 catalysts synthesized by using different sulfur precursors (Mo-S-T, Mo-S-L and Mo-S-S are from thiourea, L-cystine and sulfur powder, respectively)
Figure 6 Kinetic relations (ln(1-x) vs. t) for the HDO of p-cresol over Mo-S-C, Mo-S-L, Mo-S-S and Mo-S-T at 275 ℃
Table 1 Reaction results for HDO of p-cresol on MoS2 catalysts at 275 and 300 ℃ for 8 h
Catalyst p-cresol conversion x/% Product distribution wm/% D.D./% 4-methylcyclohexene methylcyclohexane toluene 275 ℃ Mo-S-C 8.8 7.1 3.1 89.9 7.6 Mo-S-T 87.4 5.5 26.1 68.4 85.8 Mo-S-L 84.4 4.4 25.5 70.2 82.5 Mo-S-S 70.3 5.9 20.2 73.9 67.2 300 ℃ Mo-S-C 29.1 6.5 7.9 85.6 26.0 Mo-S-T 99.4 4.3 16.1 79.7 99.3 Mo-S-L 95.2 3.9 17.5 78.7 94.4 Mo-S-S 90.1 4.4 13.5 82.2 88.7 
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