Precursores LaNiO3/La2NiO4 suportados em MCM-41 para obtenção de hidrogênio a partir da reforma a seco do metano.

• Autor(a) principal: Agostinho, Lenilton Vidal
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/38348
• topic: Hidrogênio.; MCM-41.; Perovskita.; Reforma a Seco do Metano.; Methane Dry Reforming.; Hydrogen.; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA

The energy generation in the face of growing energy demand is a challenge to maintain the social welfare, especially if we take into account the strong presence of oil in the energy matrix. Added to this, there is the link between oil and climate changes due to carbon dioxide (CO2) emissions. In an attempt to cease such problems, hydrogen (H2) stands out as an energy source due to its high conversion and efficiency. With the increase of environmental awareness, the Methane Dry Reforming, MDR, is highlighted due to the use of CO2 in synthesis gas generation (H2 and CO). Nickel catalysts are widely studied because of its low cost and stability. As a catalyst, nickel can be obtained from the perovskite LaNiO3 because of perovskite’s good stability. Perovskite compounds have low surface area, limiting their use. The use of supports with high surface area, such as MCM-41, increases the surface area of the catalyst. One of the problems in supporting perovskites on MCM-41 is the high temperature required to form them, which would destabilize the MCM-41 structure. The present work aims to put together MCM-41 and perovskite proprieties preparing LaNiO3 and La2NiO4 in situ by wet impregnation as precursors of Ni0/La2O3 supported on MCM-41. The calcination temperature (700°C) was chosen because it was intermediate to that of perovskite formation and destabilization of the MCM-41 structure. The XRD results show a mixture of NiO, La2O3, LaNiO3 and La2NiO4, whereas the post-TPR XRD show Ni0 and La2O3. MDR results in fixed-bed reactor show CH4 and CO2 conversion rates around 88.8 and 88.1%, respectively, for a ten-hour analysis, as well as H2/CO> 1 ratio, indicating good results for hydrogen generation.