Melo, Dulce Maria de AraújoAnjos, Gineide Conceição dos2017-09-192017-09-192017-05-26ANJOS, Gineide Conceição dos. Uso da diatomita como suporte de catalisadores de Ni e Co na reação de reforma a seco do metano. 2017. 107f. Tese (Doutorado em Ciência e Engenharia de Materiais) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2017.https://repositorio.ufrn.br/jspui/handle/123456789/23945Due to environmental requirements and to the development of the chemical industry, the demand for hydrogen has been getting an important focus in the energy, input and environmental sectors. Since the two major methods used in obtaining hydrogen are steam and dry methane reforming reactions. The greatest challenge faced by hydrogen production reactions is to find long-term stable catalysts that are also resistant to carbon accumulation and selective to the formation of hydrogen gas. Besides lowering the cost, the utilization of catalytic supports has important role for the reforming reactions, increasing the chemical and thermal resistance during the processes, besides, it provides good dispersion of the active phase, avoiding avoiding the sinterization of the active phase, influencing positively the activity and stability of the catalyst. In this context, this work aims to use diatomite as catalytic support to disperse the metallic phases of Ni and Co, evaluating the catalysts obtained for the methane dry reforming process, as well as evaluating the effects of addition of Ce and La as promoters to the most effective catalysts. Monometallic and bimetallic Ni and Co catalysts were prepared with different active phase concentrations using the wet impregnation methodology. The support and the active phases were evaluated according to the following characterization methods: X-ray diffraction (XRD), adsorption and desorption of N2, thermogravimetric analysis (TGA), X-ray fluorescence (XRF), programmed reduction temperature (TPR) and scanning electron microscopy (SEM). The catalytic tests were performed in a quartz fixed bed differential reactor at 700°C. The products formed during a reaction were analyzed by gas chromatography. The results showed that the mono and bimetallic Ni and Co were formed. The catalyst with 8% of Ni and 2% of Co concentrations supported on diatomite showed good interaction with the support, low reduction temperature profile and and good stability over the 10h test. The catalyst containing 10% Ni had the greatest activity during this reaction. The use Ce or O promoters had no influence to the catalytic properties and led to a higher formation of coke. In all cases studied, the diatomite was shown to be chemical and thermally stable during the preparation of the catalysts and the catalytic test, being considered, therefore, an excellent support for the dry reforming reaction of methane.Acesso AbertoDiatomitaNíquelCobaltoHidrogênio e reforma a secodoctoralThesisCNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA