本文選題：納米二氧化鈦　切入點(diǎn)：溶膠-凝膠　出處：《東北師范大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：選擇性催化還原(SCR)脫硝技術(shù)的核心是催化劑,載體是這種催化劑的一個(gè)重要組成部分,載體的好壞決定著催化劑的機(jī)械強(qiáng)度及比表面積,負(fù)載活性組分的載體需要具有大的比表面積,這樣可以使催化劑具有很好的性能。銳鈦礦型納米Ti O2具有粒徑小、比表面積大、吸附能力強(qiáng)的性質(zhì),利于活性組分負(fù)載,所以廣泛應(yīng)用在脫硝技術(shù)中。目前工業(yè)上用的脫硝催化劑大部分是以銳鈦礦型納米Ti O2為載體的,但商用納米二氧化鈦粒度分布不均勻,尺寸分布范圍較廣,且粒徑也普遍較大,用作光催化劑的納米二氧化鈦粒徑太小,一般為1-10 nm,制備這種類型的納米二氧化鈦所用的原料成本較高,而且制備工藝也不適合于工業(yè)生產(chǎn)。粒度分布均勻,粒徑大小在20-40 nm的二氧化鈦具有較大的比表面積、較強(qiáng)的表面酸性等特點(diǎn),滿足工業(yè)上對(duì)催化劑的要求。目前研究較多的是溶膠-凝膠法制備的二氧化鈦,但這些研究主要是針對(duì)作為光催化劑的納米二氧化鈦,所制得的納米Ti O2粒徑都較小,一般在1-10 nm之間,作為SCR脫硝催化劑載體,粒徑偏小。本文根據(jù)目前的研究現(xiàn)狀,旨在制備出適合做工業(yè)催化劑載體的二氧化鈦,分別用溶膠-凝膠法和均勻沉淀法合成了20~40 nm且粒度分布均勻的納米二氧化鈦。在本文的第二章中用溶膠-凝膠法探究出鈦酸丁酯用量為10 m L時(shí),無(wú)水乙醇用量為69-80 m L,冰醋酸用量為4-6 m L,蒸餾水用量為2-8 m L,p H值為2-3,表面活性劑SDS的用量為3%(占鈦酸丁酯的比例),在600℃下煅燒,合成了具有銳鈦礦型的納米二氧化鈦,粒徑在20~40 nm。在第三章中用均勻沉淀法,探究出制備20-40 nm二氧化鈦所需要的條件為:n(Ti OSO4):n(尿素)為1/2-1/4之間,反應(yīng)溫度為86-90℃,反應(yīng)時(shí)間為4 h,分散劑PEG400用量為0.5-1 m L,煅燒溫度為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，

本文編號(hào)：1605613