钾/锰助剂对氮掺杂碳纳米管负载铁基催化剂在CO2加氢过程中的影响研究

工程（英文） ›› 2017, Vol. 3 ›› Issue (3) : 385-392.

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工程（英文） ›› 2017, Vol. 3 ›› Issue (3) : 385-392. DOI: 10.1016/J.ENG.2017.03.013
研究论文
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钾/锰助剂对氮掺杂碳纳米管负载铁基催化剂在CO2加氢过程中的影响研究

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Effects of Potassium and Manganese Promoters on Nitrogen-Doped Carbon Nanotube-Supported Iron Catalysts for CO2 Hydrogenation

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Abstract

Nitrogen-doped carbon nanotubes (NCNTs) were used as a support for iron (Fe) nanoparticles applied in carbon dioxide (CO2) hydrogenation at 633 K and 25 bar (1 bar= 105 Pa). The Fe/NCNT catalyst promoted with both potassium (K) and manganese (Mn) showed high performance in CO2 hydrogenation, reaching 34.9% conversion with a gas hourly space velocity (GHSV) of 3.1 L·(g·h)−1. Product selectivities were high for olefin products and low for short-chain alkanes for the K-promoted catalysts. When Fe/NCNT catalyst was promoted with both K and Mn, the catalytic activity was stable for 60 h of reaction time. The structural effect of the Mn promoter was demonstrated by X-ray diffraction (XRD), temperature-programmed reduction (TPR) with molecular hydrogen (H2), and in situ X-ray absorption near-edge structure (XANES) analysis. The Mn promoter stabilized wüstite (FeO) as an intermediate and lowered the TPR onset temperature. Catalytic ammonia (NH3) decomposition was used as an additional probe reaction for characterizing the promoter effects. The Fe/NCNT catalyst promoted with both K and Mn had the highest catalytic activity, and the Mn-promoted Fe/NCNT catalysts had the highest thermal stability under reducing conditions.

Keywords

CO2 hydrogenation / Iron catalyst / Nitrogen-doped carbon nanotubes / Manganese promoter / Potassium promoter

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. . Engineering. 2017, 3(3): 385-392 https://doi.org/10.1016/J.ENG.2017.03.013

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Acknowledgements

This work is supported by the Synchrotron Light Research Institute (Public Organization), Thailand (GS-54-D01) and the Commission on Higher Education, Ministry of Education, Thailand, and was performed under the project “Sustainable Chemical Synthesis (SusChemSys),” which is co-financed by the European Regional Development Fund (ERDF) and the state of North Rhine-Westphalia, Germany, under the Operational Programme “Regional Competitiveness and Employment” 2007–2013.

Compliance with ethics guidelines

Praewpilin Kangvansura, Ly May Chew, Chanapa Kongmak, Phatchada Santawaja, Holger Ruland, Wei Xia, Hans Schulz, Attera Worayingyong, and Martin Muhler declare that they have no conflict of interest or financial conflicts to disclose.

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2017 2017 THE AUTHORS. Published by Elsevier LTD on behalf of the Chinese Academy of Engineering and Higher Education Press Limited Company. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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