Controlled synthesis of α-Al2O3 supported Ag particles with tuning catalytic performance

IF 2.6 4区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Yang Nan, Zhuoran Deng, Zhao Xi, Dengfeng Wu
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引用次数: 1

Abstract

Abstract Herein, α-Al2O3 supported Ag particles with controllable size distribution are prepared successfully by tuning of the calcination conditions through an impregnation method. The size of Ag particles could be adjusted by changing the calcination time and temperature. The catalyst samples were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and other characterization methods under different calcination conditions, and the performance differences of their catalytic reduction of p-nitrophenol (4-NP) were investigated by UV-Vis spectroscopy. The results show that the Ag particles with increased particle size can be obtained on the surface of α-Al2O3 support by increasing the calcination time or calcination temperature. The catalytic performance of the samples obtained by increasing the calcination time decreased, while the catalytic performance of the samples obtained by increasing the calcination temperature increased. This may be due to the interaction between Ag particles and the support, which changes the valence state of Ag species. Also the particle size effect acts on the catalyst and affects its catalytic performance together with the change of valence.
α-Al2O3负载银颗粒的可控合成及其调控催化性能
摘要通过浸渍法制备了粒径分布可控的α-Al2O3负载银颗粒。通过改变煅烧时间和温度可以调节银颗粒的大小。采用扫描电镜(SEM)、x射线衍射(XRD)、x射线光电子能谱(XPS)等表征方法对催化剂样品在不同焙烧条件下进行了分析,并利用紫外可见光谱研究了它们催化还原对硝基苯酚(4-NP)的性能差异。结果表明:随着煅烧时间的延长或煅烧温度的升高,α-Al2O3载体表面均可获得粒径增大的Ag颗粒;增加煅烧时间得到的样品的催化性能降低,而增加煅烧温度得到的样品的催化性能提高。这可能是由于银粒子与载体之间的相互作用改变了银的价态。此外,粒径效应还与价态的变化一起影响催化剂的催化性能。
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来源期刊
Journal of Experimental Nanoscience
Journal of Experimental Nanoscience 工程技术-材料科学:综合
CiteScore
4.10
自引率
25.00%
发文量
39
审稿时长
6.5 months
期刊介绍: Journal of Experimental Nanoscience, an international and multidisciplinary journal, provides a showcase for advances in the experimental sciences underlying nanotechnology and nanomaterials. The journal exists to bring together the most significant papers making original contributions to nanoscience in a range of fields including biology and biochemistry, physics, chemistry, chemical, electrical and mechanical engineering, materials, pharmaceuticals and medicine. The aim is to provide a forum in which cross fertilization between application areas, methodologies, disciplines, as well as academic and industrial researchers can take place and new developments can be encouraged.
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