硫化态PtMo/γ-Al_2O_3催化剂活性位的低温CO-FTIR方法表征及噻吩HDS活性的研究  

Studies on Characterization of Active Sites of Sulfided PtMo/γ-Al_2O_3 Catalysts by Using Low Temperature FTIR Spectroscopy of Adsorbed CO and Their Thiophene HDS Activity

作　　者：齐兴义[1] 郭林[1] 李文钊[2] 辛勤[2] Michel Lacroix Michel Vrinat Francoise Mauge 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083 [2]中国科学院大连化学物理研究所,大连116023 [3]Institut de Recherches surla Catalyse [4]Laboratoire Catalyseet Spectrochimie

出　　处：《高等学校化学学报》2002年第7期1395-1399,共5页Chemical Journal of Chinese Universities

摘　　要：A series of sulfided PtMo/ γ Al 2O 3 catalysts[ w (Mo)=9.0%] with different contents of Pt were characterized by using low temperature FTIR spectroscopy 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+ ←CO and Pt 0←CO→Pt 0 was observed at 77 K and that the rate of the thiophene HDS reaction(573 K) is well linearly proportional to the area of the Pt 0←CO band at 2 093 cm -1 with a higher extrapolated HDS rate compared to that of sulfided Mo/ γ Al 2O 3 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 S may be formed over sulfided PtMo/ γ Al 2O 3 catalysts during the sulfidation process and that both Mo 2+ and Pt 0 sites for CO adsorption should be the active reaction centers of thiophene HDS.A series of sulfided PtMo/ γ Al 2O 3 catalysts[ w (Mo)=9.0%] with different contents of Pt were characterized by using low temperature FTIR spectroscopy 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+ ←CO and Pt 0←CO→Pt 0 was observed at 77 K and that the rate of the thiophene HDS reaction(573 K) is well linearly proportional to the area of the Pt 0←CO band at 2 093 cm -1 with a higher extrapolated HDS rate compared to that of sulfided Mo/ γ Al 2O 3 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 S may be formed over sulfided PtMo/ γ Al 2O 3 catalysts during the sulfidation process and that both Mo 2+ and Pt 0 sites for CO adsorption should be the active reaction centers of thiophene HDS.

关 键 词：硫化态 PtMo/γ-Al2O3催化剂 表征 HDS 低温CO-FTIR 噻吩 加氢脱硫 活性中心 催化活性 氧化铝负载铂钼催化剂 

分 类 号：O626.12[理学—有机化学] O643.361[理学—化学]