聚合物辅助成型法制备纳米Co_3O_4/CeO_2催化剂及其对CO低温氧化性能研究  

Polymer-assisted synthesis of nanoparticle Co_3O_4/CeO+2 catalyst for carbon monoxide low-temperature oxidation

作　　者：李文成[1] 王际童[1,2] 黄海鸿[1] 乔文明[1] 龙东辉[1] 凌立成[1] 

机构地区：[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

出　　处：《环境科学学报》2016年第1期294-300,共7页Acta Scientiae Circumstantiae

基　　金：中国博士后科学基金(No.2013M540338)~~

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Co_3O_4/CeO_2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Co_3O_4/CeO_2催化剂,Ce的加入有利于获得具有更小尺寸的Co_3O_4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.Co3O_4/ CeO_2 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 N2adsorption/ 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 Co_3O_4, resulting in the Co_3O_4 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.

关 键 词：聚合物辅助成型法 CO3O4 CEO2 CO低温氧化 

分 类 号：X131[环境科学与工程—环境科学] X511