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Materiais catalíticos à base de Ni e Co suportados em SBA-15 para aplicação em reforma a vapor do etanol e reforma a seco do metano

机译:SBA-15负载Ni和Co的催化材料在乙醇蒸汽重整和甲烷干重整中的应用

摘要

In the last years, the processes of reform for the production of hydrogen as an energetic vector have been well studied because of the increase of the demand for alternative technologies of energy generation, showing a good relation cost/benefit when compared to other technologies of hydrogen production. In addition, they have advantages from an environmental point of view, not contributing to the increase of CO2 concentration in the atmosphere. However, hydrogen production through reform processes, while promising, still presents many technological bottlenecks, requiring advances in new materials with catalytic properties. In this proposal, the goal of this work is to obtain catalytic materials with high reactivity and selectivity for products in the face of reactions of steam reforming of ethanol (SRE) and dry reforming of methane (DRM). Catalysts based on nickel and cobalt supported on SBA-15 were prepared by wet impregnation method and characterized before and after the catalytic tests by several techniques: Thermogravimetric Analysis (TGA), Fourier Transformer Infrared Spectroscopy (FT- IR), X-ray diffraction (XRD), Temperature Programmed Reduction (TPR), Nitrogen Adsorption and Desorption, X-ray Diffraction in situ (XRD in situ), and Scanning Electron Microscopy (SEM) with Energy Spectroscopy (ES) to understanding the mechanisms involved in the reforming reactions and also responsible for the deposition of carbon on the catalysts. The catalysts tested against the steam reaction of ethanol for 6 hours at 500 ºC presented an initial conversion around 80-100 %, with H2 (60-70 %), CO2 (18-23 %) and only traces of CO (0.5-10 %), but they suffered a rapid deactivation in the first hours of test, being more promising in the dry reforming reaction of methane, which showed good activity and stability during 10 hours of reaction at 700 ºC with conversions (CH4 and CO2) and H2 yields above 80 % and low carbon deposition.
机译:近年来,由于对能源生产替代技术的需求增加,对作为能量载体的氢生产过程的改革过程进行了深入研究,与其他氢技术相比,具有很好的相关成本/收益。生产。另外,从环境角度来看,它们具有优势,而不有助于增加大气中的CO2浓度。然而,通过重整工艺生产氢尽管很有希望,但仍然存在许多技术瓶颈,需要具有催化性能的新材料的发展。在该提案中,这项工作的目标是获得面对乙醇的蒸汽重整(SRE)和甲烷的干重整(DRM)的反应具有高反应活性和选择性的催化材料。采用湿法浸渍法制备了负载在SBA-15上的镍和钴基催化剂,并在催化试验之前和之后通过以下几种技术进行了表征:热重分析(TGA),傅立叶变换红外光谱(FT-IR),X射线衍射( XRD),程序升温还原(TPR),氮吸附和解吸,原位X射线衍射(原位XRD)以及具有能谱(ES)的扫描电子显微镜(SEM),以了解重整反应和还负责碳在催化剂上的沉积。在500ºC下针对乙醇的蒸汽反应6小时进行测试的催化剂表现出约80-100%的初始转化率,其中氢气(60-70%),二氧化碳(18-23%)和仅少量的二氧化碳(0.5-10) %),但它们在测试的头几个小时就迅速失活,在甲烷的干重整反应中更有希望,在700ºC的反应10个小时内,甲烷(转化为CH4和CO2)和H2表现出良好的活性和稳定性收率超过80%,碳沉积量低。

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