Navegação Física por Autor "Bernardi, Fabiano"
Resultados 1-11 de 11
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Determinação da posição reticular de F em Si
Bernardi, Fabiano (2006) [Dissertação]Neste trabalho, estudamos a posição de átomos de F na estrutura cristalina do Si. As amostras foram pré-amorfizadas utilizando um feixe de Si de 200 keV e, após, implantadas com F. Então recristalizamos a camada amorfa ... -
Elucidating the electronic nature of the Strong Metal-Support Interaction (SMSI) effect
Figueiredo, Wallace Torres de (2022) [Tese]As industrial interest turned to the development of petrochemical processes, the investment in the development of the heterogeneous catalysis field increased. Nevertheless, classical catalysts still present unsettled ... -
Elucidation of catalytic events at atomic level in Cu𝑥Ni1-𝑥/CeO2 (0<𝑥<1) nanoparticles applied to the reverse water-gas shift (RWGS) reaction
Figueiredo, Wallace Torres de (2017) [Dissertação]The CO2 molecule is the main responsible for the negative consequences of the greenhouse effect. The increasing numbers associated to the amount of CO2 emission in the atmosphere have attracted the attention of scientists ... -
Elucidation of the kinetics of the redox reaction of highly reducible CeO2-x (0 < x < 0.5) nanoparticles
Vogt, Marco Antônio Haas (2020) [Dissertação]The cerium oxide CeO2-x (0 < x < 0.5) has been strongly studied due to the high technological potential for several applications. CeO2-x presents high facility to change the oxidation state between Ce(III) (x = 0.5) and ... -
Estudo das propriedades eletrônicas e estruturais de catalisadores avançados
Bernardi, Fabiano (2010) [Tese]Neste trabalho, foram elucidadas as propriedades eletrônicas e estruturais de catalisadores avançados na forma de nanopartículas bimetálicas de PtxPd1-x (x = 1, 0,7, 0,5, 0,3 ou 0) submetidas a diferentes tratamentos ... -
Improving the photodegradation of dyes with SrTiO3-modified nanoparticles
Girotto, Gustavo Zottis (2021) [Dissertação]Nowadays, thousands of tons of dyes are produced worldwide annually by the industry, and almost one-third of these substances is thrown into effluents. Methylene blue is a widely used dye. Thus, there is a strong need to ... -
Influência da composição, arranjo atômico e suporte na reatividade de nanopartículas de Pt-Pd com o enxofre
Gorgeski, Andreia (2014) [Tese]Neste trabalho, foram produzidas e caracterizadas nanopartículas (NPs) de Pt-Pd com diferentes composições e arranjos atômicos suportadas em sílica (SiO2), carvão ativado (CA) e carbono Vulcan (C). As NPs de diferentes ... -
A new proposal for avoiding sintering of nanoparticles in catalysis
Figueiredo, Fabio Rasera (2021) [Dissertação]Sintering is a process whereby nanoparticles increase their size and reduce their number under high temperatures. Since catalytic activity depends on the number of active sites, and those lie on the surface of nanoparticles, ... -
Superhydrophobic Pt-CeO2 nanoparticles as efficient catalyst for the reverse water-gas shift reaction
Santos, Kauê Giese Gomes dos (2023) [Dissertação]The excessive burning of fossil fuels like oil and coal increased the CO2 concentration in the atmosphere and it currently exceeds 400 ppm. Consequently, the greenhouse effect increases the average Earth’s temperature, ... -
Tuning the electronic and structural properties of cerium oxide nanoparticles for the H2 production photocatalytic reaction
Thill, Alisson Steffli (2018) [Dissertação]The photocatalytic water splitting reaction showed to be a promising process to obtain renewable and clean energy, but the efficiency reached in this process is still low and must be improved to be viable. Considering this, ... -
Unraveling the influence of the CeO2-x (0 ≤ x ≤ 0.5) properties on the reactivity of the Cu-CeO2-x nanoparticles towards the CO oxidation reaction
Matte, Lívia Pugens (2019) [Dissertação]Carbon monoxide is a poisonous, odor- and colorless gas, formed by incomplete combustion of organic matter, such as fossil fuels and vegetation. An efficient way to reduce the emission of this gas in the atmosphere is by ...