Tar reduction in downdraft biomass gasifier using a primary method

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Correlation between structural and catalytic properties of copper supported on porous alumina for the ethanol dehydrogenation reaction

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Photoelectrochemical reduction of CO2 on Cu/Cu2O films: Product distribution and pH effects

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Lichenoid reaction: case report

Lichenoid lesions are mucocutaneous disease of chronic inflammatory origin. Can produce side effects to drugs, dental materials, affecting 0.5 to 1% of the world population mainly in women in the fourth decade of life. The history and meticulous clinical servation may clarify the reactive nature, but the clinical diagnosis will only be conclusive when associated with tests such as histopathology. Therefore the objective of the study is to report a case of a woman of 55 years old, complaining of "white spots sore". Reported being allergic to metals, chocolate, acidic foods and certain types of clothes. From accurate intraoral clinical examination, white plaques were found in the dorsum of the tongue, hard palate and buccal mucosa, inaccurate and rough limits, and ulcerations throughout the labial edge and upper palate. Histopathology revealed a lichenoid reaction. Was instituted as pharmacological treatment, the use of systemic corticosteroids. Clinical follow-up of one year showed reduction of clinical symptoms, allowing to conclude that the clinical follow-up of this disease is necessary since its dubious malignant potential and diagnostic difficulty. Thus, early recognition of this disease allows instituting appropriate treatment with relief of anxiety of the patient and their family.

Bio-hydrogen production based on catalytic reforming of volatiles generated by cellulose pyrolysis: an integrated process for ZnO reduction and zinc nanostructures fabrication

The paper presents a process of cellulose thermal degradation with bio-hydrogen generation and zinc nanostructures synthesis. Production of zinc nanowires and zinc nanoflowers was performed by a novel processes based on cellulose pyrolysis, volatiles reforming and direct reduction of ZnO. The bio-hydrogen generated in situ promoted the ZnO reduction with Zn nanostructures formation by vapor–solid (VS) route. The cellulose and cellulose/ZnO samples were characterized by thermal analyses (TG/DTG/DTA) and the gases evolved were analyzed by FTIR spectroscopy (TG/FTIR). The hydrogen was detected by TPR (Temperature Programmed Reaction) tests. The results showed that in the presence of ZnO the cellulose thermal degradation produced larger amounts of H2 when compared to pure cellulose. The process was also carried out in a tubular furnace with N2 atmosphere, at temperatures up to 900 °C, and different heating rates. The nanostructures growth was catalyst-free, without pressure reduction, at temperatures lower than those required in the carbothermal reduction of ZnO with fossil carbon. The nanostructures were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM). The optical properties were investigated by photoluminescence (PL). One mechanism was presented in an attempt to explain the synthesis of zinc nanostructures that are crystalline, were obtained without significant re-oxidation and whose morphologies are dependent on the heating rates of the process. This route presents a potential use as an industrial process taking into account the simple operational conditions, the low costs of cellulose and the importance of bio-hydrogen and nanostructured zinc.