|
10:00-10:40
|
Starbons - a versatile family of mesoporous solids derived from biomass
James H. Clark (University of York)
Abstract: Potential applications of the new class of carbonaceous porous materials, Starbons®, developed in the Green Chemistry Centre of Excellence at the University of York, have been growing, and include water treatment, catalysis and solid phase extractions. The material is produced from renewable polysaccharides, such as waste starch, alginic acid and pectin, which are widely available from agricultural and food industry waste streams. Some materials can be made directly from seaweed. Through process optimization the large-scale route to these materials is becoming solvent and energy efficient, and therefore more economically viable. The characteristic feature of Starbons® is their mesoporosity, greater pore volume and tenability of the surface energy characteristics. These characteristics can lead to faster adsorption and desorption diffusion rates and hence potential for selective adsorption and the recovery of species from solution. In this way we have been able to use Starbons in separations of various complex organics and in the recovery of valuable metals from waste streams. Thus we can aim for the "double green" application of materials derived from waste being used to recover valuable materials form other waste streams.
Selected references
Titirici, M-M., White, R.J., Brun, N., Budarin, V.L., Sheng Su, D., del Monte, F., Clark, J.H., and MacLachlang, M.J. (2015). Sustainable Carbon Materials. Chemical Society Reviews, 44, 250-290.
Dodson, J.R., Budarin, V.L., Hunt, A.J., Shuttleworth, P.S. & Clark, J.H. (2013). Shaped mesoporous materials from fresh macroalgae. J. Mater. Chem. A, 1 (17), 5203 – 5207.
|
|
10:40-11:20
|
Design of supported metal nanoparticle catalysts for green reactions
Liane Márcia Rossi, Instituto de Química, USP, São Paulo, Brasil
Abstract: The development of the field of nanoscience brought great advances to the design and characterization of heterogeneous catalysts. One of the main advantages of employing metal nanoparticles in catalysis is the growing number of metal centers and thus potential active sites, as the size decreases; however this is not the only and often not even the most important advantage with respect to traditional heterogeneous catalysts. Metallic nanoparticles are able to develop catalytic activities not seen in the corresponding bulk materials and high selectivity in catalytic transformations. Much remains to be discovered regarding the influence of nanoparticle size and composition on catalytic activity. The control of those parameters is of pivotal importance for catalytic studies. Here we will discuss the strategies under development in our research group for the synthesis of supported metal nanoparticles (mono and bimetallic) and their application for green oxidations and reductions. We will highlight their application in liquid phase and gas phase reactions of industrial interest.
|
|
11:20-12:00
|
Etanol: uma surpreendente molécula plataforma
Lucia Gorenstin Appel, Divisão de Catálise e Processos Químicos, INT, Rio de Janeiro, Brasil.
Resumo: A recém-iniciada produção do etanol de segunda geração no Brasil sinaliza no sentido de uma futura grande disponibilidade deste álcool como insumo industrial. O etanol é atualmente reconhecido como uma molécula plataforma extremamente versátil. A partir dela é possível obter diversos intermediários e produtos químicos de larga utilização via processos em uma etapa empregando catalisadores multifuncionais. Nesta apresentação serão exemplificadas as diversas possibilidades de emprego do etanol como matéria-prima para a Indústria Química, com destaque para os seguintes tópicos: relevância dos compostos gerados, os mecanismos reacionais envolvidos e o estagio da pesquisa nos temas em questão.
|
|
14:00-14:40
|
Catalytic conversion of renewable biomass resources
James A. Dumesic, Department of Chemical and Biological Engineering, University of Wisconsin, Madison, EUA
Abstract: The high selectivity of biocatalysis to remove functionality from biomass can be used to produce platform molecules that are suitable for subsequent upgrading over heterogeneous catalysts. Accordingly, the more robust continuous processing allowed by chemical catalysis can be leveraged to upgrade biologically-derived platform molecules to produce direct or functional replacements for petroleum products. We will discuss recent results that utilize a combination of chemical and biological catalysis, and we will identify challenges that need to be addressed to bridge the gap between the two catalytic approaches. For example, new generations of heterogeneous catalysts are required for stable operation under liquid phase reaction conditions in the presence of biogenic impurities. In addition, the design and syntheses of new catalysts are required to tailor the active sites and the environment around these sites to achieve selective conversion of the functional groups present in bio-renewable platform molecules.
|
|
14:40-15:20
|
Exemplos de catálise para o desenvolvimento sustentável: produção de hidrogênio a partir da decomposição do ácido acético e conversão catalítica do glicerol em presença do dióxido de carbono
Fábio Barboza Passos, Departamento de Engenharia Química Universidade Federal Fluminense, Niterói, Brasil
Resumo: O crescente interesse no desenvolvimento sustentável exige que os processos químicos otimizem o seu consumo de energia e que se valorizem as chamadas tecnologias limpas. A presente conferência apresenta dois casos da aplicação de catalisadores heterogêneos para o uso eficiente de matérias-primas e energia. Serão apresentados os resultados de estudos sobre o efeito do suporte na produção de hidrogênio a partir da decomposição do ácido acético sobre o ácido acético e resultados sobre a conversão de glicerol sub-produto do biodiesel, em presença do bio-diesel.
|
