Studies on Characterization of Active Sites of Sulfided PtMo/γ-Al2O3 Catalysts by Using Low Temperature FTIR Spectroscopy of Adsorbed CO and Their Thiophene HDS Activity

Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (7): 1395.

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Studies on Characterization of Active Sites of Sulfided PtMo/γ-Al₂O₃ Catalysts by Using Low Temperature FTIR Spectroscopy of Adsorbed CO and Their Thiophene HDS Activity

QI Xing-Yi¹, GUO Lin¹, LI Wen-Zhao², XIN Qin², Michel-Lacroix³, Michel-Vrinat³, Francoise-Mauge⁴

1. Faculty of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
3. Institut de Recherches surla Catalyse, 2 Avenue Albert Einst ein, 69626 Villearbanne Cedex, France;
4. Laboratoire Catalyseet Spectrochimie, I.S.M.R.A., F-14050 Caen Cedex, France

Received:2001-06-18 Online:2002-07-24 Published:2002-07-24

Abstract

Abstract: Aseries of sulfided PtMo/γ-Al₂O₃ catalysts[ w (Mo)=9.0%] with different contents of Pt were characterized by using low temperature FTIRspectroscopy of adsorbed CO, while their HDS activity was investigated with thiophene as a model substrate. Experimentally, it was found that no existence of the bands related to the surface complexes of Al ³⁺ ←COand Pt⁰←CO→Pt⁰ was observed at 77 Kand that the rate of the thiophene HDS reaction(573 K) is well linearly proportional to the area of the Pt⁰←COband at 2093 cm^-1 with a higher extrapolated HDS rate compared to that of sulfided Mo/γ-Al₂O₃ catalyst at the zero content of platinum. On the basis of the results here, the conclusion may be made that the active monolayer phase of Pt Mo Smay be formed over sulfided PtMo/γ-Al₂O₃ catalysts during the sulfidation process and that both Mo ²⁺ and Pt⁰ sites for COadsorption should be the active reaction centers of thiophene HDS .

Key words: Sulfided /γ-Al₂O₃, Low temperature CO FTIR, Thiophene, HDS

CLC Number:

O643.36

TrendMD:

QI Xing-Yi, GUO Lin, LI Wen-Zhao, XIN Qin, Michel-Lacroix, Michel-Vrinat, Francoise-Mauge . Studies on Characterization of Active Sites of Sulfided PtMo/γ-Al₂O₃ Catalysts by Using Low Temperature FTIR Spectroscopy of Adsorbed CO and Their Thiophene HDS Activity[J]. Chem. J. Chinese Universities, 2002, 23(7): 1395.

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Studies on Characterization of Active Sites of Sulfided PtMo/γ-Al₂O₃ Catalysts by Using Low Temperature FTIR Spectroscopy of Adsorbed CO and Their Thiophene HDS Activity

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