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摘要: 以MoO3为前驱体,CH4/4H2为碳化介质,通过程序升温反应法(TPRe)制备了不同晶型碳化钼 (β-Mo2C和α-MoC1-x) 催化材料,并通过XRD、BET、TEM、SEM和XPS等表征手段对碳化钼材料的晶体结构、比表面积、形貌及电子特征进行了研究;同时考察了不同晶型碳化钼的CO加氢反应性能。结果表明,其具有很高CO加氢活性,产物主要为烷烃,同时有少量低碳醇生成。因此,碳化钼有望成为新型FT合成或低碳醇合成的催化剂。Abstract: Molybdenum carbide of both β-Mo2C and α-MoC1-x crystalline forms was prepared by temperature programmed reaction (TPRe) between MoO3 and CH4/4H2. The structure and morphology of molybdenum carbide were characterized by XRD, BET, TEM, SEM and XPS. Its catalytic activity in the hydrogenation of carbon monoxide were investigated under 573K, 8.0MPa, GHSV=2000h-1, n(H2)/n(CO)=1.0. The results indicated that light hydrocarbons of C1~4 are the main products in the hydrogenation of carbon monoxide over molybdenum carbides, with the formation small amounts of alcohols (< 4%). Molybdenum carbide could then be a potential catalyst for the F-T synthesis or the alcohol synthesis.
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Key words:
- molybdenum carbides /
- preparation /
- characterization /
- CO hydrogenation
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