Melo, Dulce Maria de AraújoMaziviero, Fernando Velcic2018-08-272021-09-272018-08-272021-09-272018-07-09MAZIVIERO, Fernando Velcic. Estudo comparativo entre os suportes γ-Al2O3 e α-Al2O3 obtidos via combustão por micro-ondas para catalisadores de Ni no processo de reforma a seco do metano. 2018. 53f. Trabalho de Conclusão de Curso (Graduação em Química) Instituto de Química, Universidade Federal do Rio Grande do Norte, Natal - RN, 2018.https://repositorio.ufrn.br/handle/123456789/38238The dry reforming of methane process is a technology that uses two of the greenhouse gases (CO2 and CH4) to produce synthesis gas (H2 and CO) which has several industrial applications and is a source of clean energy. The process occurs with CO2 acting as oxidizing agent of CH4 in the presence of a heterogeneous catalyst. Among the catalysts used in the dry reforming of methane, the nickel supported in alumina (Al2O3) is outstanding due to its high stability, high conversion values and low cost when compared with noble metal catalysts. This work aims to prepare the Al2O3 substrates in the gamma (γ) and alpha (α) phases by means of the micro-wave assisted combustion synthesis method for subsequent impregnation with Ni as the active phase and the catalytic stability test process of methane reforming. The materials prepared were characterized by the techniques of X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Programmed Temperature Reduction (RTP). The results showed that the α-Al2O3 obtained presents a high degree of crystallinity without the presence of secondary phases, whereas the γ-Al2O3 presents amorphous structure characteristic of this type of material indicating that the synthesis method is quite effective in the preparation of oxide powders aluminum. In the process of dry reforming of methane the Ni γ-Al2O3 catalyst showed a better yield since it had initial CH4 and CO2 conversion rates close to 90% and a drop of only 14% during the 20 hour test, the catalyst Ni/α-Al2O3 obtained good conversion values in the initial moments, equating to the catalyst supported in gamma alumina, but presented a rapid and progressive decrease in the performance finishing the 20 hours of test with conversion rates around 45% for the CH4 and CO2. The carbon deposited in the form of coke on the surface of the catalyst was quantified through thermogravimetric (TG) analysis and it was found that the catalyst supported on alpha alumina produced more coke, which was the reason why it was attributed the rapid drop in the performance of the catalyst.openAccessReforma a seco do metanoGás de sínteseSíntese por combustãoAlfa aluminaGama aluminaNi/Al2O3bachelorThesisCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::FISICO-QUIMICA::CINETICA QUIMICA E CATALISE