FeN particles confined inside CNT for light olefin synthesis from syngas: Effects of Mn and K additives
FeN particles confined inside CNT for light olefin synthesis from syngas: Effects of Mn and K additives
复制标题
FeN 颗粒限制在 CNT 内，用于合成气合成轻质烯烃：Mn 和 K 添加剂的影响
DOI：
10.1016/j.cattod.2011.11.034
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发表时间：
2012-06-01
期刊：
影响因子：
5.3
通讯作者：
Bao, Xinhe
中科院分区：
文献类型：
--
作者：
Yang, Zhiqiang;Pan, Xiulian;Bao, Xinhe
采用X射线衍射（XRD）、透射电子显微镜（TEM）、Fe-57穆斯堡尔效应谱（MES）和CO程序升温脱附（TPD）等手段，研究了锰和钾对碳纳米管负载FeN催化剂的结构和形貌、物相组成以及CO吸附行为的影响。结果表明，锰的存在有利于氮在立方相FeCxN 1-x中的保留，有利于CO的吸附。Mn（1.0 wt%）/FeN/CNT催化剂对（C_2C_4 =）-C-=低碳烯烃的选择性提高，但活性在Mn的负载量为0.5-2.0 wt%范围内降低。虽然K的进一步促进可以稍微提高活性，但低碳烯烃的选择性降低。同时，钾的加入增强了水煤气变换活性，并改变了对重质烃（C5+）的选择性，类似于常规的还原铁催化剂。(C)2011年爱思唯尔B。V.保留所有权利。
The effects of manganese and potassium on the structural and morphological properties, phase compositions and CO adsorption behavior of the CNT-confined FeN catalyst were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fe-57 Mossbauer effect spectroscopy (MES) and CO temperature-programmed desorption (TPD). The results suggested that the presence of manganese helps retain nitrogen in cubic FeCxN1-x and facilitates CO adsorption. The selectivity to (C2C4=)-C-= light olefins is enhanced over Mn(1.0 wt%)/FeN/CNT although the activity decreases within the loading range of 0.5-2.0 wt% for Mn. Although further promotion with K could improve the activity slightly, the selectivity to light olefins decreases. At the same time, the addition of potassium enhanced the water gas shift activity and shifted the selectivity to heavy hydrocarbons (C5+), similar to the conventional reduced iron catalysts. (C) 2011 Elsevier B. V. All rights reserved.