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粒径均匀脱硝催化剂载体纳米二氧化钛的制备

发布时间:2018-03-13 08:35

  本文选题:纳米二氧化钛 切入点:溶胶-凝胶 出处:《东北师范大学》2015年硕士论文 论文类型:学位论文


【摘要】:选择性催化还原(SCR)脱硝技术的核心是催化剂,载体是这种催化剂的一个重要组成部分,载体的好坏决定着催化剂的机械强度及比表面积,负载活性组分的载体需要具有大的比表面积,这样可以使催化剂具有很好的性能。锐钛矿型纳米Ti O2具有粒径小、比表面积大、吸附能力强的性质,利于活性组分负载,所以广泛应用在脱硝技术中。目前工业上用的脱硝催化剂大部分是以锐钛矿型纳米Ti O2为载体的,但商用纳米二氧化钛粒度分布不均匀,尺寸分布范围较广,且粒径也普遍较大,用作光催化剂的纳米二氧化钛粒径太小,一般为1-10 nm,制备这种类型的纳米二氧化钛所用的原料成本较高,而且制备工艺也不适合于工业生产。粒度分布均匀,粒径大小在20-40 nm的二氧化钛具有较大的比表面积、较强的表面酸性等特点,满足工业上对催化剂的要求。目前研究较多的是溶胶-凝胶法制备的二氧化钛,但这些研究主要是针对作为光催化剂的纳米二氧化钛,所制得的纳米Ti O2粒径都较小,一般在1-10 nm之间,作为SCR脱硝催化剂载体,粒径偏小。本文根据目前的研究现状,旨在制备出适合做工业催化剂载体的二氧化钛,分别用溶胶-凝胶法和均匀沉淀法合成了20~40 nm且粒度分布均匀的纳米二氧化钛。在本文的第二章中用溶胶-凝胶法探究出钛酸丁酯用量为10 m L时,无水乙醇用量为69-80 m L,冰醋酸用量为4-6 m L,蒸馏水用量为2-8 m L,p H值为2-3,表面活性剂SDS的用量为3%(占钛酸丁酯的比例),在600℃下煅烧,合成了具有锐钛矿型的纳米二氧化钛,粒径在20~40 nm。在第三章中用均匀沉淀法,探究出制备20-40 nm二氧化钛所需要的条件为:n(Ti OSO4):n(尿素)为1/2-1/4之间,反应温度为86-90℃,反应时间为4 h,分散剂PEG400用量为0.5-1 m L,煅烧温度为600℃。
[Abstract]:The core of selective catalytic reduction (SCR) denitrification is the catalyst, and the support is an important part of the catalyst. The quality of the support determines the mechanical strength and specific surface area of the catalyst. The support of the active component should have a large specific surface area, which can make the catalyst have good performance. The anatase nano-TiO _ 2 has the properties of small particle size, large specific surface area and strong adsorption ability, which is beneficial to the loading of the active component. So it is widely used in denitrification technology. At present, most of the denitrification catalysts used in industry are supported by anatase nano-TiO _ 2, but the size distribution of commercial nano-TiO _ 2 is not uniform, and the size distribution range is relatively wide. The particle size of nano-TiO _ 2 used as photocatalyst is too small, generally ranging from 1-10 nm to 10 nm, so the cost of raw materials for preparing this type of nano-TiO _ 2 is high. The preparation process is not suitable for industrial production. Titanium dioxide with particle size of 20-40 nm has large specific surface area and strong surface acidity. At present, most of the researches are on the preparation of TIO _ 2 by sol-gel method, but these studies mainly focus on the nanometer TIO _ 2 which is used as photocatalyst, and the diameter of nano-TiO _ 2 is smaller. Generally, the particle size of SCR denitrification catalyst is small in the range of 1-10 nm. According to the present research situation, the purpose of this paper is to prepare titanium dioxide suitable for industrial catalyst support. Nanocrystalline TIO _ 2 was synthesized by sol-gel method and homogeneous precipitation method respectively. In the second chapter of this paper, the amount of butyl titanate was found to be 10 mL by sol-gel method. Anatase nano-TiO _ 2 with anatase type was synthesized by calcination of anatase type TIO _ 2 at 600 鈩,

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