关键词:

Pt-Sn-Li/Al₂O₃/FeCrAl催化剂, 金属基载体, 长链烷烃（十二烷）, 脱氢, 表征

Abstract:

Pt-Sn-Li/Al₂O₃/FeCrAl catalyst was prepared by using FeCrAl alloy foil as the base of support and Pt-Sn-Li/γ-Al₂O₃ as the active coating.The catalyst was characterized by means of XRD，SEM，H₂-TPR.The effects of temperature，LHSV and the molar ratio of hydrogen to alkane on the catalytic performance for the long chain alkane dehydrogenation were investigated in a fixed-bed microreactor.The results indicated that the adhesiveness between support and active coating was very good，and only less than 2% coating was peeled off after ultrasonic vibration treatment.The interaction between Al₂O₃/FeCrAl metallic composite support and active components was strengthened distinctly，after the active coating was supported on FeCrAl alloy foil.A higher temperature benefited the dehydrogenation reaction，but an overly high temperature would accelerate the coking deactivation of catalyst.A lower LHSV benefited the conversion of the alkanes，but a further decrease of LHSV would reduce the selectivity of the alkenes.A lower molar ratio of hydrogen to alkane benefited the conversion of the alkanes，but similarly，a too low molar ratio of hydrogen to alkane would accelerate the catalyst deactivation by carbon deposition.

Key words:

Pt-Sn-Li/Al₂O₃/FeCrAl催化剂, 金属基载体, 长链烷烃（十二烷）, 脱氢, 表征