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Braulio Silva Barros Bráulio Silva Barros holds a DSc in Materials Science and Engineering from the Federal University of Rio Grande do Norte at Natal and PhD in Chemistry of Catalytic Materials from the University of Strasbourg in France. He was a Lecturer at the School of Science and Technology of the Federal University of Rio Grande do Norte, where he was the coordinator of the Laboratory of Multifunctional Materials and Numerical Experimentation. He is currently a Lecturer in the Department of Mechanical and Materials Engineering of the Federal University of Pernambuco and Researcher of the National Council for Scientific and Technological Development (CNPq). He is acting mainly in the following topics: Nanostructured catalysts for hydrogen production via catalytic reforming of natural gas; Bifunctional catalyst materials/absorbent for hydrogen production with simultaneous capture of CO2; Luminescent nanoparticles as platforms for the development of biomarkers; Synthesis and characterization of new coordination polymers (MOFs - Metal Organic Frameworks). |
Braulio Silva Barros
UFPE – Recife - PE
Resumo
Hydrogen is considered one of the most promising alternatives to fossil fuels. However, it is mainly obtained from syngas resulting from natural gas steam reforming (SMR), producing a significant amount of carbon dioxide as a side product. Carbon dioxide emission (CO2) is a major contributor to global warming, and one-third of those emissions come from fuel combustion for power generation. A new interesting process has been described to control CO2 emission: the reforming optimized by CO2 sorption, which associates conventional methane reforming and in situ capture of CO2 via absorption in a solid oxide. Furthermore, this strategy can increase the H2 production and concentrate CO2 for the eventual use as chemicals or energy vectors. Alkaline and alkaline-earth ceramics have been proposed for CO2 capture through adsorption and chemisorption processes. These materials can be classified into two large groups: dense and porous ceramics. Dense ceramics mainly trap CO2 chemically: the CO2 is chemisorbed. Among these ceramics, CaO is the most studied one. CaO-based materials have been highlighted as the solid sorbents in the capture of CO2 because of their favorable thermodynamic and chemical properties. The main problem with CaO is the strong decrease in the sorption capacity after multiple carbonation–calcination cycles. This talk will cover some strategies to improve this sorption capacity, such as the deposition of calcium oxide on an inert support, Ca12Al14O33 (mayenite). This oxide has no sorption properties but presents a large surface area, and provides stable network inhibiting deactivation of CaO by sintering.