纳米二氧化钛的制备及其催化氧化一氧化碳研究

发布时间：2018-03-09 02:31

本文选题：溶胶-凝胶　切入点：水凝胶　出处：《上海应用技术学院》2015年硕士论文　论文类型：学位论文

【摘要】：纳米二氧化钛作为一种功能材料,具备一系列优良的性能。由于二氧化钛中存在晶体缺陷,为氧空位存在提供了条件,其作为催化剂受到了越来越多的关注。本文采用溶胶一凝胶法、水凝胶模板法制备出了纳米二氧化钛,采用微流控制备出了二氧化钛微球,并比较了它们负载氧化铜之后的催化性能。采用正交试验的方法制备出不同配比下的凝胶,根据正交试验发现了水解抑制剂是影响钛酸四丁酯水解的主要因素,丙烯酸做抑制剂时凝胶时间比乙酸做抑制剂时长,且制备出的晶粒直径更小；抑制剂的加入延缓了晶相的转变抑制了晶粒的长大。采用水凝胶模板法制备出了纳米二氧化钛,在制备过程中,有效的抑制了钛酸四丁酯的水解,在水凝胶未吸水之前没有或只有很少量的钛酸四丁酯水解。讨论了影响微流控前驱体溶液稳定性的因素—丙烯酰胺的用量、硝酸的加入量和加水量。选用聚乙二醇/聚丙烯酸前驱体溶液合成的微球,制备的Ti02微球尺寸均匀,球形度较好,但焙烧后微球表面比较粗糙。XRD分析表明Ti02微球的晶粒尺寸10nm,晶体结构为锐钛矿相。测定了锐钛矿催化氧化一氧化碳的活性,发现锐钛矿型二氧化钛具有催化活性,但是不高。制备了负载氧化铜的催化剂,比较了各个催化剂的催化活性。
[Abstract]:Nano titanium dioxide as a kind of functional material, has a series of excellent performance. Due to the presence of crystal defects in titanium dioxide, provided the conditions for the existence of oxygen vacancies, the catalyst has attracted more and more attention. This paper adopts the method of sol-gel, hydrogel template method prepared nanometer titanium dioxide was prepared by micro flow control TiO2 microspheres and their catalytic performance of supported copper oxide. After preparation by orthogonal test method was prepared under different ratio of the gel, according to orthogonal test found that hydrolysis inhibitors are the main factors influencing the hydrolysis of titanium acid butyl ester four, acrylic acid as inhibitor gel time inhibitors than acetic acid, and the prepared the grain diameter is smaller; inhibitors added delay phase shift inhibit grain growth. The hydrogel template prepared two nanometer titanium dioxide, In the preparation process, effectively inhibited the hydrolysis of four butyl titanate, no water or not before the hydrogel with only a small amount of four butyl titanate hydrolysis. The paper discusses the factors affecting the microfluidic precursor solution stability of acrylamide, nitrate content and water content. The polyethylene glycol / polyacrylic acid precursor solution the synthesis of microspheres, preparation of Ti02 microspheres with uniform size, good sphericity, but after roasting microspheres with rough surface.XRD analysis showed that the grain size of 10nm Ti02 microspheres, the crystal structure of anatase anatase. The catalytic oxidation of carbon monoxide were investigated, found that anatase TiO2 with catalytic activity, but not the high load oxidation catalyst. Copper was prepared and compared the catalytic activity of different catalysts.

【学位授予单位】：上海应用技术学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ134.11;TB383.1

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