Korean Journal of Chemical Engineering

, Volume 35, Issue 4, pp 867–874 | Cite as

Methanol aromatization over CrZn-modified HZSM-5 catalysts

Catalysis, Reaction Engineering
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Abstract

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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Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2018

Authors and Affiliations

  • Bei Liu
    • 1
  • Siwu Lu
    • 1
  • Enzhou Liu
    • 1
  • Xiaoyun Hu
    • 2
  • Jun Fan
    • 1
  1. 1.School of Chemical EngineeringNorthwest UniversityXi’anP. R. China
  2. 2.School of PhysicsNorthwest UniversityXi’anP. R. China

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