Get access

Base-free catalytic aerobic oxidation of mercaptans for gasoline sweetening over HTLcs-derived CuZnAl catalyst

Authors

  • Lida Gao,

    1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Dept. of Chemistry, East China Normal University, Shanghai 200062, China
    Search for more papers by this author
  • Qingsong Xue,

    1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Dept. of Chemistry, East China Normal University, Shanghai 200062, China
    Search for more papers by this author
  • Ye Liu,

    1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Dept. of Chemistry, East China Normal University, Shanghai 200062, China
    Search for more papers by this author
  • Yong Lu

    Corresponding author
    1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Dept. of Chemistry, East China Normal University, Shanghai 200062, China
    • Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Dept. of Chemistry, East China Normal University, Shanghai 200062, China
    Search for more papers by this author

Abstract

An aerobic oxidative removal of mercaptans from gasoline in the absence of liquid base has been demonstrated for gasoline sweetening over CuZnAl catalyst. This process could proceed at large WHSV of gasoline (50–70 h−1) with >95% mercaptan conversion at 150°C (or 300°C) using an O2/S molar ratio of 20–40. At 150°C, dimerization of mercaptans occurred dominantly to form their disulfides. At 300°C, deep oxidation of the mercaptans to SO2 was the dominant process in the first tens of hours, but it decreased then with prolonged time on stream and meanwhile the dimerization increased. The spent catalyst could be restored to its fresh activity level only through a calcination treatment in air. This process was also demonstrated to be effective and efficient for sweetening of a real cracking gasoline. © 2009 American Institute of Chemical Engineers AIChE J, 2009

Get access to the full text of this article

Ancillary