IR spectroscopy evidence of MoS2 morphology change by citric acid addition on MoS2/Al2O3 catalysts - A step forward to differentiate the reactivity of M-edge and S-edge

被引：73

作者：

Chen, Jianjun ^{[1
]}

Mauge, Francoise ^{[1
]}

El Fallah, Jaafar ^{[1
]}

Oliviero, Laetitia ^{[1
]}

机构：

[1] Univ Caen, CNRS, ENSICAEN, Lab Catalyse & Spectrochim, F-14050 Caen, France

来源：

JOURNAL OF CATALYSIS | 2014年 / 320卷

关键词：

Chelating agent; Hydrodesulfurization; MoS2 slab-support interaction; CO adsorption; Sulfur vacancy formation; Thiophene adsorption; Intrinsic activity; SCANNING-TUNNELING-MICROSCOPY; CHEMICAL-POTENTIAL ANALYSIS; ATOMIC-SCALE STRUCTURE; HYDROTREATING CATALYSTS; HYDRODESULFURIZATION CATALYSTS; MOLYBDENUM SULFIDE; CARBON-MONOXIDE; CO ADSORPTION; ACTIVE PHASE; AB-INITIO;

D O I：

10.1016/j.jcat.2014.10.005

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Citric acid was used as chelating agent to prepare a series of MOS2/Al2O3 catalysts. CO adsorption followed by infrared spectroscopy characterization (IR/CO) was employed to probe the M-edge and S-edge of MOS2 slabs on these catalysts. Addition of citric acid promotes the growth of S-edge, whereas it inhibits that of M-edge: The morphology of MoS2 is progressively modified from a slightly truncated triangle with predominately M-edge to a hexagon with both M-edge and S-edge with increasing citric acid amount. Such morphology change is of great importance to the catalytic performance as M-edge and S-edge demonstrate different reactivity in hydrodesulfurization (HDS) reactions. Indeed, IR/CO data reveal that sulfur vacancy creation occurs more easily on M-edge, whereas at room temperature, thiophene tends to adsorb more strongly on S-edge. Moreover, parallel between IR/CO study and HDS test shows that S-edge has a higher intrinsic activity than M-edge in thiophene HDS reaction. (C) 2014 Elsevier Inc. All rights reserved.

引用

页码：170 / 179

页数：10

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