Journal
RSC ADVANCES
Volume 7, Issue 54, Pages 34012-34022Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra05924h
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- BIPC, Mahshahr, Iran [08-133/57666]
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A mild, specific one-step dealumination of ZSM-5 is reported for the first time that significantly increases para xylene selectivity and ethyl benzene conversion by disproportionation in the xylene isomerization reaction of xylene mixtures/ethyl benzene feeds under industrial conditions, i.e., 380 degrees C, 390 degrees C and 400 degrees C, at a pressure of 8 bar, weight hourly space velocity (WHSV) values of 2 to 8 h(-1), and a H-2/HC ratio of 4. Oxalic acid and ammonium hexafluorosilicate (AHFS) were used as dealuminating agents. Mild increases of the Si/Al molar ratio by one unit using oxalic acid or by 10 units using AHFS resulted in a more than 10% increase in para xylene when approaching equilibrium at 400 degrees C and WHSV = 2 h(-1). However, the oxalic acid-treated sample increased ethylbenzene conversion by more than 30% with respect to the parent zeolite under the applied operating conditions. The AHFS-treated samples exhibited decreases in ethylbenzene conversion irrespective of the extent of dealumination.
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