Novel Fe/MnK-CNTs nanocomposites as catalysts for direct production of lower olefins from syngas

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• 作者：Di Wang ; Jian Ji ; Bingxu Chen ; Wenyao Chen ; Gang Qian ; Xuezhi Duan ; Xinggui Zhou ; Anders Holmen ; De Chen and John C. Walmsley
• 刊名：AIChE Journal
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：63
• 期：1
• 页码：154-161
• 全文大小：935K
• ISSN：1547-5905

文摘

Novel Fe/MnK-CNTs nanocomposites are developed as catalysts for direct production of lower olefins from syngas, delivering a high iron time yield of 337.2 μmol_CO· gFe−1·s⁻¹ with 51.3%C selectivity toward C₂C₄ olefins under the optimal reaction conditions (270°C, 2.0 MPa, 30,000 mL h⁻¹ gcat−1). These catalysts are optimized by varying calcination temperature from 150 to 400°C. Multiple techniques including transmission electron microscopy, Elemental mapping, X-ray diffraction, X-ray photoelectron spectroscopy, H₂-temperature-programmed reduction, and Raman were employed to reveal the relationship between the catalyst nature and unique catalytic behavior. In particular, the resultant catalyst from the calcination temperature of 220°C exhibits the highest selectivity of C₂C₄ olefins as well as good stability, which are enabled by the trade-off among the effects of iron particle sizes, promoters, metal-support interaction and support surface chemistry. Moreover, influences of reaction temperature, reaction pressure and space velocity are also investigated.