Influence of Mo modification on coaromatization coupling methanol with n-hexane over [Zn,Mo]/HZSM-5 catalysts

[Zn,Mo]/HZ-5 catalysts were prepared using an impregnation method and the influence of Mo content on the catalytic performance was investigated. All prepared catalysts were well characterized by XRD, FTIR, N-2 adsorption/desorption, TEM, ICP, XPS, NH3-TPD, Py-FTIR and GC-MS. It was found that coaromatization had higher aromatics yield and more stability. The modification with Mo species adjusted the acidity of Zn/HZ-5 and increased the amount of Zn(OH)(+) species. As a result, [Zn,Mo]/HZ-5 improved the dehydroaromatization ability and provided higher aromatics yield. The behaviors of carbon deposit and deactivation were also studied. The BTEX yield reached the maximum of 64.0% under the optimized conditions of 470 & DEG;C and WHSV = 1.0 h(-1).

Automated summary

The [Zn,Mo]/HZ-5 catalysts were prepared using the impregnation method, and the effect of Mo content on catalytic performance was investigated. The catalysts were characterized by various techniques, and it was found that coaromatization process had higher aromatics yield and better stability. The modification with Mo species regulated the acidity of Zn/HZ-5 and increased the amount of Zn(OH)(+) species, resulting in improved dehydroaromatization ability and higher aromatics yield. The carbon deposit and deactivation behaviors were also studied, and under the optimized conditions of 470°C and WHSV = 1.0 h(-1), the BTEX yield reached a maximum of 64.0%.