期刊信息
- 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
- 主办： 河北师范大学
- ISSN： 1000-5854
- CN： 13-1061/N
- 中国科技核心期刊
- 中国期刊方阵入选期刊
- 中国高校优秀科技期刊
- 华北优秀期刊
- 河北省优秀科技期刊
α-MnO2纳米颗粒的可控制备及其催化性能
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1. 河北师范大学 化学与材料科学学院, 河北 石家庄 050024;
2. 河北省栾城县楼底中学, 河北 石家庄 051430 -
DOI：10.11826/j.issn.1000-5854.2014.03.013
Controllable Preparation and Catalytic Performance of α-MnO2 Nanoparticles
摘要/Abstract
以高锰酸钾和硫代硫酸钠为前驱物，采用氧化还原沉淀法可控制备了α-MnO2纳米颗粒，并以邻二甲苯为目标污染物评价了α-MnO2纳米颗粒对其深度催化氧化性能的影响.考察了pH值、反应物的摩尔比、焙烧温度对催化剂结构和活性的影响.采用X射线衍射、扫描电子显微镜和比表面积分析仪对催化剂进行了表征.结果发现，该类α-MnO2纳米颗粒的催化活性和稳定性良好，在400~700℃保持晶型稳定，粒径为25~50nm.其中，当反应原料的反应摩尔比为8∶3、pH=5、焙烧温度400℃时所制备的催化剂可在220℃时使0.06%（体积分数）的邻二甲苯完全转化为CO2和H2O，表现出最好的催化活性，并且其活性在连续60h的测试中保持稳定.
α-MnO2 nanoparticles were prepared by using redox-precipitation reaction method, in which the KMnO4 and Na2S2O3 were used as the precursors.The paper inspected the reaction mechanism of α-MnO2 on catalytic combution o-xylene .Effects of pH, molar ratio of reactants, and calcination temperature on its catalytic activity were investigated.The X-ray diffraction(XRD), brunauer emmett teller(BET), scanning electron microscope(SEM) were used to characterize these catalysts.The results found that the α-MnO2 nanoparticles showed good thermal stability and good catalytic activity.The catalyst keep stable crystal shape from 400 to 700℃ and its particle size is between 25 to 50 nm.Among them, α-MnO2 nanoparticles which were prepared at the condition of the raw materials for reaction molar ratio is 8:3, pH=5, and calcination temperature is 400℃, can make 0.06% o-xylene completely transformed into water and carbon dioxide at 220℃, and showed the best catalytic activity.The catalyst remained stable after a continuous activity test 60h.
关键词
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