Effects of Potassium and Manganese Promoters on Nitrogen-Doped Carbon Nanotube-Supported Iron Catalysts for CO_2 Hydrogenation

作     者：Praewpilin Kangvansura Ly May Chew Chanapa Kongmark Phatchada Santawaja Holger Ruland Wei Xia Hans Schulz Attera Worayingyong Martin Muhler 

作者机构：Sciennfic Equipment Center Faculty of Science Kasetsart University Bangkok 10900 Thailand Laboratory of Industrial Chemistry Ruhr-University Bochum Bochum 44780. Germany Department of Materials Science Faculty of Science Kasetsart University Bangkok 10900 Thailand Department of Chemistry Faculty of Science Kasetsart University Bangkok 10900 Thailand Engler-Bunte-lnstitute Karlsruhe Institute of Technology Karlsruhe 76131 Germany 

出 版 物：《Engineering》 (工程（英文）)

年 卷 期：2017年第3卷第3期

页      面：385-392页

核心收录：

学科分类：0810[工学-信息与通信工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0808[工学-电气工程] 07[理学] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by the Synchrotron Light Research Institute(Public Organization) Thailand(GS-54-D01) the Commission on Higher Education Ministry of Education Thailand performed under the project"Sustainable Chemical Synthesis(Sus Chem Sys) "which is co-financed by the European Regional Development Fund(ERDF) the state of North Rhine-Westphalia Germany under the Operational Programme"Regional Competitiveness and Employment"2007–2013 

主　　题：CO_2 hydrogenation Iron catalyst Nitrogen-doped carbon nanotubes Manganese promoter Potassium promoter 

摘      要：Nitrogen-doped carbon nanotubes （NCNTs） were used as a support for iron （Fe） nanoparticles applied in car- bon dioxide （CO_2） hydrogenation at 633 K and 25 bar （1 bar = 10-5 Pa）. The Fe/NCNT catalyst promoted with both potassium （K） and manganese （Mn） showed high performance in CO_2 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 promot- ed 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 pro- moter stabilized wtistite （FeO） as an intermediate and lowered the TPR onset temperature. Catalytic ammo- nia （NH_3） 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.