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Issue
Korean Journal of Chemical Engineering,
Vol.35, No.4, 867-874, 2018
Methanol aromatization over CrZn-modified HZSM-5 catalysts
Liu B, Lu S, Liu E, Hu X, Fan J
HZSM-5 (HZ) zeolite co-modified with Zn and second promoters (Zr, Ce, Mo and Cr) was synthesized and the aromatization of methanol over the modified HZ in a fixed-bed reactor was investigated. The results of catalytic tests revealed that the methanol conversion and yield of benzene, toluene, and xylene (BTX) over the Cr, Zn comodification HZ (CrZn/HZ) were higher than that over ZrZn/HZ, CeZn/HZ, and MoZn/HZ. The catalysts were characterized by XRD, SEM, TEM, XPS, N2 isothermal adsorption-desorption and NH3-TPD. The results suggest that Zn species exist in two forms in the HZ zeolite. One is ZnO particle, the other one is ZnOH+, which significantly improveds the yield of BTX. Furthermore, the Cr species on the external surface promoted the dispersion of ZnO, increased the amount of ZnOH+, which further improved the yield of BTX. In addition, the optimal Cr2Zn1/HZ catalyst exhibited better catalytic performance and prolonged lifetime of reaction.
Keywords: Methanol to Aromatics; Bimetal-modified; CrZn/HZSM-5; BTX; ZnOH+
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[Cited By]
  1. Lee HW, Lee HJ, Park YK, Applied Chemistry for Engineering, 31(1), 57, 2020
  2. Jeong BJ, Shin MC, Jeong BH, Park JH, Korean Journal of Chemical Engineering, 38(7), 1394, 2021
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