钛铝复合载体催化剂对以CO为还原剂的同时脱硫脱硝反应的研究

发布时间：2018-03-11 02:00

  本文选题：钛铝复合载体　切入点：金属氧化物　出处：《北京石油化工学院》2015年硕士论文　论文类型：学位论文

【摘要】：大气污染物中SO2和NOx严重影响着人类的身体健康和我们的生存环境,我们应当寻找出防治空气污染的有效方法来解决二氧化硫和氮氧化物污染的问题,而直接催化还原烟气脱硫脱硝技术是在催化剂的作用下SO2和NOx与还原剂(NH3、CH4、CO等)发生还原反应生成S单质和N2的过程,此工艺操作简便、易控制,还原剂的选择具有多样性,并且能够达到同时脱除SO2和NOx的目的。本文为探寻同时脱硫脱硝活性较好的催化剂和较适宜的反应条件为目的,主要做了以下工作:1、制备了M/Ti O2/γ-Al2O3(M=Ce2O3、Co3O4、Cr2O3、CuO、NiO、Fe2O3)系列催化剂,为探求活性组分的种类、活性组分的负载含量、不同的载体以及催化剂的焙烧条件等对催化剂催化还原脱硫脱硝活性的影响,并采用XRD、H2-TPR、BET、TG-MS和SEM等技术手段对催化剂进行了晶相结构、还原活性、比表面积、表面形貌、前驱体分解温度等特性进行了一系列表征,并在气固相固定床反应装置上对催化剂的催化还原活性进行了评价,结果显示:NiO和Fe2O3为活性组分,且负载量为12%(金属氧化物占载体质量百分数),载体为15%TiO2/γ-Al2O3(TiO2占载体质量百分数),在500℃焙烧3 h的催化剂以CO为还原剂的同时脱硫脱硝性能最好,在0.05%NO+0.10%SO2+0.30%CO(N2为载气)的反应气条件下,其最高脱硫脱硝率分别96.0为%和98.6%;2、制备了多种双金属掺杂的TiO2/γ-Al2O3催化剂(x)Fe2O3(y)NiO/TiO2/γ-Al2O3、(x)Fe2O3(y)CuO/TiO2/γ-Al2O3、(x)NiO(y)CuO/TiO2/γ-Al2O3等,结果显示Fe2O3和Ni O在两者掺杂的催化剂中显示出协同的催化作用,其中2Fe2O310NiO/TiO2/γ-Al2O3催化剂脱硝率最高可达100%,最高脱硫率在97%以上,显示出较好脱硫脱硝活性。铁铜和镍铜掺杂的催化剂具有较好的同步脱硫脱硝活性,但反应温度较高;3、针对2Fe2O310NiO/TiO2/γ-Al2O3催化剂进行了体积空速、反应温度、氧气浓度系列因素对脱硫脱硝过程影响的考察,结果得到:空速为6000 h-1,反应温度500℃连续反应时具有较好的脱硫脱硝活性,脱硝率最高可达98%,脱硫率最高可达96.6%。
[Abstract]:SO2 and NOx in air pollutants seriously affect human health and our living environment. We should find effective ways to prevent and control air pollution to solve the problem of sulfur dioxide and nitrogen oxide pollution. The technology of direct catalytic reduction of flue gas desulfurization and denitrification is a process in which SO2 and NOx reacts with reductant NH _ 3H _ 4CH _ 4CO to produce S and N _ 2 under the action of catalyst. This process is simple and easy to control, and the choice of reducing agent is diverse. In this paper, in order to find out the better catalyst for simultaneous desulphurization and denitrification and the suitable reaction conditions, the following work was done: 1, to prepare M / Ti O _ 2 / 纬 -Al _ 2O _ 3 (M / Ti) O _ 2 / 纬 -Al _ 2O _ 3 (M / Ti) O _ 2O _ 3 / 纬 -Al _ 2O _ 3 / M _ 2O _ 3CO _ 3O _ 3O _ 4C _ 2O _ 3O _ 3C _ 2O _ 3O _ 3O _ 2O _ 3O _ 2O _ 3O _ 2O _ 3O _ 2O. In order to find out the kinds of active components, the loading content of active components, the different carrier and the calcination conditions of catalysts, the effects of catalyst on catalytic reduction desulphurization and denitrification activity were investigated. The crystal structure, reduction activity, specific surface area, surface morphology, precursor decomposition temperature and other properties of the catalyst were characterized by XRDX H2-TPRB TG-MS and SEM. The catalytic reduction activity of the catalyst was evaluated in a gas-solid fixed bed reactor. The results showed that: nio and Fe2O3 were active components. And the loading amount is 12: (metal oxide / mass percent of the support, support 15TiO2 / 纬 -Al2O3TiO2.The catalyst calcined at 500 鈩，

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