再次从透射电子显微镜数据计算MoS2平板形态描述符。柠檬酸和处理条件对MoS2 / Al2O3性能影响的案例研究,Applied Catalysis A: General

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再次从透射电子显微镜数据计算MoS2平板形态描述符。柠檬酸和处理条件对MoS2 / Al2O3性能影响的案例研究
Applied Catalysis A: General ( IF 4.7 ) Pub Date : 2016-10-14 09:56:42
P. Afanasiev

从透射显微镜（TEM）图像获得的硫化钼MoS ₂平板长度L和堆积量S是加氢处理硫化催化剂的主要特征，被广泛用作形态描述符。在这项工作中，我们证明了应该重新使用常规用于估计均值L和S的公式。为了获得具有物理意义的值L和S，两者均应计算为表面加权平均值。此外，必须考虑L和S之间的相关性。使用平均L和S的表面加权值，研究了一系列MoS ₂ / Al ₂ O ₃催化剂的MoS ₂相形态。Mo负载，柠檬酸添加和H ₂ S / N硫化作用的影响_研究了在350至550°C不同温度下的₂或H ₂ S / H ₂混合物。在噻吩的加氢脱硫（HDS）中对催化剂进行了评估，并通过程序升温还原（TPR）对催化剂进行了研究。对TEM，HDS和TPR数据进行彻底的统计处理表明，MoS ₂活性相的固有性质主要取决于处理气氛和温度，而不取决于柠檬酸的添加。如果将浸渍的催化剂在高于120℃的温度下干燥，则柠檬酸可以适度地改善MoS ₂形态。然而，负载的硫化物的边缘比活性仍然不受影响。

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Calculation of MoS2 slabs morphology descriptors from transmission electron microscopy data revisited. Case study of the influence of citric acid and treatment conditions on the properties of MoS2/Al2O3

Molybdenum sulfide MoS₂ slabs length L and stacking S obtained from the transmission microscopy (TEM) images are the major characteristics of hydrotreating sulfide catalysts, widely used as morphology descriptors. In this work we demonstrate that the formulae routinely used to estimate mean L and S should be revisited. To obtain physically meaningful values L and S, both should be calculated as surface weighted averages. Moreover, correlation between L and S must be taken into account. Using surface weighted values of mean L and S, MoS₂ phase morphology was studied for a series of MoS₂/Al₂O₃ catalysts. The effects of Mo loading, addition of citric acid and sulfidation by H₂S/N₂ or H₂S/H₂ mixtures at different temperatures from 350 to 550°C were studied. The catalysts were evaluated in hydrodesulfurization of thiophene (HDS) and studied by temperature programmed reduction (TPR). Thorough statistical treatment of TEM, HDS and TPR data suggests that the intrinsic properties of MoS₂ active phase depend primarily on the treatment atmosphere and temperature rather than on the addition of citric acid. If the impregnated catalyst is dried at temperature above 120°C, citric acid allows moderate improvement of MoS₂ morphology. However the edge-specific activity of supported sulfide remains unaffected.

更新日期：2016-10-15

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