Estudo dos parÃmetros influentes no sistema de hidrogenaÃÃo eletrocatalÃtica com Ãnodo de sacrifÃcio, utilizando planejamento fatorial como ferramenta de anÃlise

AUTOR(ES)

MÃrcio Vilar FranÃa Lima

DATA DE PUBLICAÇÃO

2007

RESUMO

A full factorial design 24 was used in the analysis of the main factors that can influence the electrocatalytic hydrogenation of the (+)-pulegone, using a Ni sacrificial anode (HECAS). The following factors of control had been appraised: co-solvent (H2O/MeOH or H2O/ethylene glycol (1:1)), temperature (25oC or 50oC), cathodic material (Cu or Fe/Ni (64:36) alloy) and supporting electrolyte (NH4Cl or NH4Ac (0,2 mol L-1)). The use of Ni sacrificial anode has pair purpose: to allow the use of an undivided cell and the activation of the cathodic surface. The analysis of the effect of the factors and its possible interactions disclosed that the temperature does not have significant effect for the studied system (HECAS). The factors of highest influence in the results had been cosolvent (MeOH) and supporting electrolyte (NH4Cl). The cathodic matrix presented a less significant effect in the HECAS process. The performance of the cathodic materials, Cu and Fe/Ni, had been similar, however, in the validation of the method, the use of a matrix of Fe showed that this factor can have greater influence on the process due to morphology and quality of the Ni deposit. For validation of the method four composite groups had been studied: (i) a,b-unsaturated ketones, (ii) aromatic ketones, (iii) conjugated olefins and (IV) aromatic aldehydes. For this group of composites it was observed that external factors to the HECAS process, as: extension of the substrate conjugation, type and position of the substituent, can also influence in the results

ASSUNTO(S)

hidrogenaÃÃo eletrocatalÃtica pulegona chemometrics quimiometria electrochemistry eletroquÃmica factorial design eletroquimica planejamento fatorial electrocatalytic hydrogenation pulegone

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