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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第5期    总第285期    2018年5月

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文章编号:1672-7207(2018)05-1103-07
铁镍物质的量比对双金属催化剂性能的影响
安晓倩,张古承,张静,卫陈默,周鹏,徐浩,叶倩,周冠宇,杨富花

(四川大学 建筑与环境学院,四川 成都,610065)

摘 要: 采用溶胶-凝胶法制备铁镍双金属氧化物((Fe-NiOx)催化剂以避免均相体系金属离子污染的问题。制备不同物质的量比的铁镍双金属催化剂,利用X线衍射(XRD)、X线光电子能谱(XPS)、扫描电子显微镜(SEM)、傅里叶变换红外线光谱(FT-IR)对催化剂表面特性进行表征;同时以邻苯二甲酸二甲酯(DMP)的降解率为指标衡量其异相催化臭氧(O3)的能力,并且重复使用5次以探究催化剂的稳定性。研究结果表明:制备的上述5种催化剂均表现出优越的催化性能,实验进行5 min后DMP降解率分别为85.93%,63.33%,83.92%,78.58%和80.93%;投加催化剂后,O3分解率与DMP降解率具有相似的趋势。Fe-NiOx催化剂表面组成主要为Fe3O4,NiFe2O4和NiO; Fe-NiOx催化剂微粒主要由0.1~0.3 μm颗粒集聚形成,并产生较多孔洞;Fe-NiOx催化剂表面存在表面羟基(—OH),由此推测催化过程主要为多价态金属元素及—OH共同作用的结果。

 

关键字: 高级氧化;异相催化;双金属氧化物;臭氧

Effect of Fe-Ni bimetal oxides with different element molar ratios on catalytic activity
AN Xiaoqian, ZHANG Gucheng, ZHANG Jing, WEI Chenmo, ZHOU Peng, XU Hao, YE Qian, ZHOU Guanyu, YANG Fuhua

School of Architecture & Environment, Sichuan University, Chengdu 610065, China

Abstract:Bimetal Fe-Ni oxides (Fe-NiOx) catalysts prepared by sol-gel method were synthesized to avoid the pollution caused by metal ions in homogeneous system. Different bimetal catalysts were prepared with different mole ratios of Fe and Ni, and the surface properties were characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FT-IR). The degradation rate of dimethyl phthalate (DMP) was measured as the target that revealed the activity of catalysts to activated O3, and the stability of bimetal catalysts was investigated after being used for 5 times. The results show that the prepared 5 catalysts work well and the degradation rates of DMP are 85.93%, 63.33%, 83.92%, 78.58% and 80.93% in 5 min, respectively. The O3 decomposition rates have the similar trend, indicating that the degradation rate of DMP is almost caused by the decomposition of O3. Fe3O4, NiFe2O4 and NiO are the main phases in the surface of Fe-NiOx catalysts. The average grain size of Fe-NiOx catalysts is in the range of 0.1-0.3 μm and many holes are generated with these grain assembled. There are hydroxyl groups (—OH) on the surface of catalysts. Therefore, it can be inferred that the catalytic process is possible due to the combined action of multi-valence of metal elements and —OH.

 

Key words: advanced oxidation process; heterogeneous catalysis; bimetal oxides; ozone

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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