Abstract Here in, for the first time we are reporting molybdenum carbide reduction into metallic molybdenum during methane aromatization on HZSM-5 (Si/Al ratio = 23, 30, 50 and 80) at methane space velocity of 1800 mL.gcat−.h−. Benzene yield was influenced by the surface metallic molybdenum through the non-aromatic carbon deposits formation via linear hydrocarbons degradation on HZSM-5 with fewer acidity (Si/Al ratio = 30, 50 and 80). Our XPS analysis results demonstrated improved surface metallic molybdenum in spent Mo2C/HZSM-5 = 80 (0.71 atom. %) and 50 (0.54 atom. %) samples over Mo2C/HZSM-5 = 30 (0.33 atom. %) and 23 (0.20 atom. %) samples. Furthermore, HR-TEM and FFT analysis images clearly established fine distribution of distorted spherical shaped Mo2C particles with 6–14 nm size in spent Mo2C/HZSM-5 = 23. On the other hand, Mo2C particle size was increased upto 22 nm in Mo2C/HZSM-5 = 80. The ease reduction of Mo2C into metallic molybdenum and aggregation of Mo2C particles in spent higher Si to Al ratio (50 and 80) samples was associated with weak interactions between Mo2C and the HZSM-5 with fewer acidity. At 700 °C, the order of benzene yield as follows: Mo2C/HZSM-5 = 80 (2.2%)

中文翻译：

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碳化钼负载HZSM-5（Si/Al=23、30、50和80）催化剂用于甲烷芳构化的研究

摘要 在此，我们首次报道了在 HZSM-5（Si/Al 比 = 23、30、50 和 80）上以 1800 mL.gcat−.h 的甲烷空间速度进行甲烷芳构化过程中碳化钼还原为金属钼的情况。 -. 苯产率受表面金属钼的影响，通过非芳香族碳沉积形成，通过线性烃在 HZSM-5 上降解，酸度较低（Si/Al 比 = 30、50 和 80）。我们的 XPS 分析结果表明，与 Mo2C/HZSM-5 = 30（0.33 原子%）和 23（0.33 原子0.20 原子。%) 样品。此外，HR-TEM 和 FFT 分析图像清楚地确定了在废 Mo2C/HZSM-5 = 23 中尺寸为 6-14 nm 的扭曲球形 Mo2C 颗粒的精细分布。在 Mo2C/HZSM-5 = 80 中，Mo2C 的粒径增加到 22 nm。Mo2C 容易还原为金属钼，并且 Mo2C 颗粒在高硅铝比（50 和 80）样品中的聚集与 Mo2C 之间的弱相互作用有关和酸度较低的HZSM-5。700℃时苯产率顺序为：Mo2C/HZSM-5 = 80 (2.2%)