Investigation of boron, gallium, and thallium doping effects on Mo2C-HZSM-5 catalysts, revealing distinct selectivity and coke behaviors.
Methane dehydroaromatization (MDA) is a promising route for direct conversion of methane into value-added aromatics such as benzene, toluene and naphthalene. This study investigates the effect of IIIA group metals like boron (B), gallium (Ga), and thallium (Tl) doped into Mo₂C/HZSM-5 catalysts tested for MDA at 700 oC and 1800 mL.gcat-1.h-1. The influence of promoters on catalyst acidity and coke formation was investigated through various analytical techniques including NH₃-TPD and TPO. Among the samples, Ga-Mo₂C/HZSM-5 demonstrated greater benzene selectivity and consistent stability due to abundant Mo2C and low temperature coke formations. Whereas, B- or Tl-Mo₂C/HZSM-5 suffered from high temperature coke formations related to their greater acidity and greater extent of surface molybdenum oxidized species.
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Pasupulety et al. (2025) studied this question.
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