-The liquid phase oxidation of glycerol was performed producing fine organic acids. Catalysts based on Pt, Pd and Bi supported on activated carbon were employed to perform the conversion of glycerol into organic acids at 313 K, 323 K and 333 K, under atmospheric pressure (1.0 bar), in a mechanically agitated slurry reactor (MASR). The experimental results indicated glycerol conversions of 98% with production of glyceric, tartronic and glycolic acids, and dihydroxyacetone. A yield of glyceric acid of 69.8%, and a selectivity of this compound of 70.6% were reached after 4 h of operation. Surface mechanisms were proposed and rate equations were formulated to represent the kinetic behavior of the process. Selective formation of glyceric acid was observed, and the kinetic parameter values indicated the lowest activation energy (38.5 kJ/mol) for its production reaction step, and the highest value of the adsorption equilibrium constant of the reactant glycerol (10 -4 dm 3 /mol).
As reações de oxidação do glicerol em meio alcalino utilizando catalisador de ouro 3% suportado em carvão ativado mostraram eficientes a produção de ácido glicérico. Estudos experimentais realizados a pressão atmosférica e temperatura ótima de 60 o C em reator trifásico do tipo de leito de lama apontaram para um aumento da conversão superior a 90% e seletividade em ácido glicérico de 83,58% a partir da comparação dos resultados obtidos com diferentes proporções molares Glicerol/Au. O catalisador com teor de ouro (3%), preparado por impregnação úmida, seguiu a metodologia da Solução de ouro, utilizando como agente redutor o THPC, tendo sido caracterizado pelos métodos de DRX, TGA e BET, e relacionado com o seu desempenho nas reações de oxidação, possibilitando previsões ótimas de conversão, seletividade e estabilidade da fase metálica.
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