Dehydroaromatization of methane (MDA) reaction was investigated over platinum modified Mo/H-ZSM-5 catalysts which were pre-carbided at 750 °C. The influence of platinum on the catalytic performance and product selectivity of Mo/H-ZSM-5 catalysts for the MDA reaction at 700 °C were studied. The presence of platinum led to a slight decrease in methane conversion from 7.5 to 4.2%. Aromatic selectivities above 90% were obtained with catalysts containing low platinum loadings (0.5 and 1.0 wt.%), with benzene being the most prominent product. A decrease in coke selectivity and coke deposits was noted with the platinum modified Mo/H-ZSM-5 zeolite catalysts. A comparative study was performed to compare platinum, palladium and ruthenium promoted Mo/H-ZSM-5 zeolite catalysts with un-promoted Mo/H-ZSM-5. The ruthenium promoted catalyst proved to be superior in catalytic performance, with a higher methane conversion obtained than that found for platinum promoted and palladium promoted Mo/H-ZSM-5 catalysts. Benzene selectivity of about 60% was obtained for ruthenium and palladium promoted Mo/H- ZSM-5 catalysts and the total aromatic selectivity was maintained at 90%. TGA results showed a total reduction of 50% by weight of carbon deposited on the promoted Mo/H-ZSM-5 catalyst.

Graphic abstract

中文翻译：

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负载贵金属的Mo / H-ZSM-5沸石催化剂上甲烷的脱氢芳构化

在铂改性的Mo / H-ZSM-5催化剂上研究了甲烷的脱氢芳构化（MDA）反应，该催化剂在750°C时预碳化。研究了铂对Mo / H-ZSM-5催化剂在700°C下MDA反应的催化性能和产物选择性的影响。铂的存在导致甲烷转化率从7.5％略降至4.2％。用低铂含量（0.5和1.0重量％）的催化剂获得高于90％的芳族选择性，其中苯是最突出的产物。用铂改性的Mo / H-ZSM-5沸石催化剂发现焦炭选择性和焦炭沉积的降低。进行了比较研究，以比较铂，钯和钌促进的Mo / H-ZSM-5沸石催化剂与未促进的Mo / H-ZSM-5催化剂。事实证明，钌助催化剂的催化性能优越，与铂助催化剂和钯助催化剂的Mo / H-ZSM-5催化剂相比，甲烷转化率更高。对于钌和钯促进的Mo / H-ZSM-5催化剂，获得约60％的苯选择性，并且总芳族选择性保持在90％。TGA结果显示沉积在促进的Mo / H-ZSM-5催化剂上的碳的总重量减少了50％。

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