Melo, Dulce Maria de AraújoMaziviero, Fernando Velcic2021-08-022021-08-022021-01-05MAZIVIERO, Fernando Velcic. Influência dos promotores em catalisadores Ni-X/Al2O3 (X = Mn, Mg, P e Ce) aplicados na reforma a seco do metano. 2021. 82f. Dissertação (Mestrado em Química) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2021.https://repositorio.ufrn.br/handle/123456789/32961The dry reforming of methane process (RSM) is a technology that uses two of the main greenhouse gases (CH4 and CO2) for the production of syngas (H2 and CO), which has several industrial applications in addition to hydrogen be considered a source of clean and highly efficient energy, giving it high commercial value. Nickel-based catalysts based on alumina were prepared containing the Mg, Mn, Ce and P promoters, chosen due to their different chemical properties. The synthesis method used for the support was microwave assisted combustion where urea was used as fuel for the process in quantities below the stoichiometric point in order to obtain lower crystallinity Al2O3 in the gamma phase. The promoters and the active phase were incorporated into the support using the sequential impregnation method via incipient wetness, ending the synthesis stage with heat treatment at a temperature of 550 ° C for three hours. The obtained materials were characterized by X-Ray Diffraction (XRD), spectroscopy in the infrared region with Fourier transform (FTIR), Temperature Programmed Reduction (TPR) and in-situ X-Ray Diffraction using a synchrotron radiation source to analyze the variation of the structure during the activation step. The catalytic test was carried out at a temperature of 700 °C with GHSV = 100 L.g -1 .h-1 for 20 hours and the carbon formed was quantified through thermogravimetric analysis. The results indicated that successive steps of solubilization and calcination resulting from the sequential impregnation method cause structural changes, altering the degree of crystallinity of the Al2O3 support in the catalyst with the promoters. In the catalytic stability test the material containing Mn promoter obtained the best performance with 79.9% conversion of methane in the first minutes of reaction, in which the presence of MnO2 favored parallel reactions of decomposition of methane during the DRM process. The catalysts containing phosphorus and cerium produced smaller amounts of coke compared to the standard catalyst, decreasing by up to 30.7% the carbon generated due to the interaction of the promoters with the carbon on the surface of the catalytic sites, in addition to acting on the particle size obtained for an active phase.Acesso AbertoReforma do metanoGás de síntesePromotores catalíticosNi/Al2O3masterThesis