研究报告
李文成,王际童,黄海鸿,乔文明,龙东辉,凌立成.聚合物辅助成型法制备纳米Co3O4/CeO2催化剂及其对CO低温氧化性能研究[J].环境科学学报,2016,36(1):294-300
聚合物辅助成型法制备纳米Co3O4/CeO2催化剂及其对CO低温氧化性能研究
- Polymer-assisted synthesis of nanoparticle Co3O4/CeO2 catalyst for carbon monoxide low-temperature oxidation
- 基金项目：中国博士后科学基金(No.2013M540338)
- 作者
- 单位
- 李文成
- 华东理工大学化学工程联合国家重点实验室, 上海 200237
- 王际童
- 1. 华东理工大学化学工程联合国家重点实验室, 上海 200237;2. 中国科学院山西煤炭化学研究所炭材料重点实验室, 太原 030001
- 黄海鸿
- 华东理工大学化学工程联合国家重点实验室, 上海 200237
- 乔文明
- 华东理工大学化学工程联合国家重点实验室, 上海 200237
- 龙东辉
- 华东理工大学化学工程联合国家重点实验室, 上海 200237
- 凌立成
- 华东理工大学化学工程联合国家重点实验室, 上海 200237
- 摘要：采用聚合物辅助成型法,以乙二胺四乙酸(EDTA)和聚乙烯亚胺(PEI)为配位体制备了Co3O4/CeO2催化剂,对其进行了氮气吸附、XRD、XPS、SEM、TEM、H2-TPR和CO-TPR等表征,并考察了材料的CO低温催化性能.结果表明,采用聚合物辅助成型法能够合成出具有三维空间网络结构的纳米Co3O4/CeO2催化剂,Ce的加入有利于获得具有更小尺寸的Co3O4颗粒,并提高Co3+的相对含量,从而有利于CO低温催化性能的提高;Ce/Co的摩尔比为1时,样品具有最佳的CO催化性能,在催化温度为30℃时,可使初始浓度为100 ppm的CO完全转化;同时,纯氧气加热吹扫有利于催化剂的稳定再生.本研究可为CO低温催化剂的制备提供重要参考.
- Abstract：Co3O4/CeO2 catalysts were prepared by a polymer-assisted chemical solution using ethylenediaminetetraacetic acid (EDTA) and polyethyleneimine (PEI) as binding ligands. The physicochemical properties of the catalysts were characterized by N2 adsorption/desorption, X-ray diffraction (XRD), X-ray photoelectron (XPS), scanning electron microscopy (SEM), transmission electron microscope (TEM), H2 temperature programmed reduction (H2-TPR) and CO temperature programmed reduction (CO-TPR). The catalytic activities toward oxidation of CO over the catalysts were investigated at ambient condition. The results showed that Ce could facilitate the dispersion of Co3O4, resulting in the Co3O4 with small crystallite size. Moreover, it could also increase the content of higher valence state cobalt (Co3+), which possesses higher catalytic activity. The optimal Ce/Co mole ratio was found to be 1:1, achieving a complete oxidation of CO at 30℃ for a CO concentration of 100 ppm. The deactivated catalyst could be easily regenerated via the heat treatment in the percent of oxygen. The present work provides a new approach of preparing the catalyst for low temperature CO oxidation.
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