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Sousa-Aguiar E.F.,Petrobras | Sousa-Aguiar E.F.,Federal University of Rio de Janeiro | Trigueiro F.E.,Instituto Nacional Of Propriedade Industrial | Zotin F.M.Z.,State University of Rio de Janeiro
Catalysis Today | Year: 2013

This brief review has the objective of showing the role of the rare earth in the context of Fluid Catalytic Cracking (FCC). REHY and RENaY zeolites, two of the most important components of FCC catalysts, were extensively studied in the past years. Their properties were evaluated in different conditions and the discussions of their main characteristics were revisited. It has been shown that RE elements migrate to smaller cages upon calcination and, once located in these cages, they form bridges with framework oxygen atoms, stabilising the zeolite structure. Some hydrolysis reactions take place over RE cations, generating Brønsted acidity and the higher the ionic radius of the RE atom, the higher the degree of hydrolysis. Besides, a correlation between the ionic radius of the RE atom, the Brønsted acidity of the zeolite and the rate of hydrogen transfer reaction was observed. Also, the use of rare earth elements as a vanadium trap has been analysed. Finally, new applications of rate earth containing zeolites in other fields than FCC catalysis indicate that this subject is still a matter of great interest. © 2013 Elsevier B.V. All rights reserved. Source


Da Silva M.L.A.,University Federeal Do Rio Of Janeiro | Britto A.C.M.,Fundacao Oswaldo Cruz | De Souza-Antunes A.M.,Instituto Nacional Of Propriedade Industrial
Quimica Nova | Year: 2010

The present work provides an overview of patent protection for second medical use of known chemical compounds, in Brazil and other countries, through the approach of the main controversies related to this theme. That issues encompass aspects related to the legality of the protection granted by the patent, the general requirements of patenteability, the ethic and social concepts and the politic and economic factors involved. This work also introduces the diverging views of the two Brazilian government agencies involved in the procedure for granting patent in the pharmaceutical area, INPI and ANVISA. Source


de Souza Antunes A.M.,Instituto Nacional Of Propriedade Industrial | de Menezes Alencar M.S.,Institute Comunicacao e Informacao Cientifica e Tecnologica em Saude | da Silva C.H.,Institute Comunicacao e Informacao Cientifica e Tecnologica em Saude | Nunes J.,Instituto Nacional Of Propriedade Industrial | Mendes F.M.L.,Federal University of Rio de Janeiro
Recent Patents on Nanotechnology | Year: 2012

The aim of the article is to present a method for identifying trends in patent applications for nanotechnology applied to the health sector around the world, based on the International Patent Classification. This classification divides the sector into: dental care, drugs, diagnostic kits, and medical apparatus & medical care. The Derwent database was mined for patent documents using nanotechnology terms associated with the IPC subclasses from the health subsectors. The number of patents was found to be rising, led by the United States, particularly universities and R&D centers. In the dental care subsector, nanotechnology was found to be used in composite material for manufacturing dental appliances. In drugs, the focus is on the use of nanoparticulate compositions comprising agents that are useful for a variety of diseases. In diagnostic kits, nanostructures have been patented that are capable of detecting target analytes. Meanwhile, in medical apparatus & medical care, patent applications have been made for nanocapsules and/or nanocomposite materials inserted in devices and guide catheters. A study was also made of patents in Brazil, where the same assignees and the same country (United States) as in the survey of global patents were found to be the leading patent applicants/holders. © 2012 Bentham Science Publishers. Source


Parkinson's disease (PD) is a neurodegenerative disorder associated to selective degeneration of dopaminergic neurons caused by an intricate relationship among dopamine metabolism, oxidative stress and α-synuclein fibrillation. Most therapies for PD have focused on dopamine replacement through the use of both monoamine oxidase inhibitors (MAOIs) and dopamine precursor L-dopa. Interestingly, certain MAOIs have a broad spectrum of action including anti-fibrillogenic properties in a-synuclein aggregation. Herein we revisit the chemical properties of MAOIs and their action on important targets associated with PD, notably α-synuclein fibrillation and dopamine metabolism, discussing the strategies associated with the development of multi-target drugs for neurodegenerative diseases. Source


Polato C.M.S.,Federal University of Rio de Janeiro | Polato C.M.S.,Instituto Nacional Of Propriedade Industrial | Rodrigues A.C.C.,Federal University of Rio de Janeiro | Rodrigues A.C.C.,ANP Technologies, Inc. | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2010

Mn, Mg, Al-spinels derived from hydrotalcite-like compounds with different Al/(M2+ + Al) molar ratios (0.25 and 0.50) and Mn/Mg of 0.30 were evaluated as catalysts for SOx removal under conditions similar to those found in fluid catalytic cracking (FCC) units. For both samples, the maximum rate of SOx pickup took place in the first 5 min of reaction, which is an interesting feature since the contact time inside the FCC regenerator is about 5-10 min. As to the regeneration step, propane seems to be a less effective reducing agent than hydrogen since it favored the release of SO2 as reduction product and shifted the reduction profile to higher temperatures. The results from XRD indicate that SO2 was mainly fixed as MgSO4, although the formation of MnSO4 has been indirectly evidenced. The performance of both samples for SOx uptake and sulfur release was also evaluated in the presence of CO and NO and no adverse effect was observed. The obtained results suggest that Mn-containing spinels are promising additives for SOx removal. © 2010 American Chemical Society. Source

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