REGENERACION EN ETAPAS DE CATALIZADORES DE Ag/CaO-Al2O3 PARA LA ELIMINACION DE ACIDO ACETICO: CARACTERIZACION FISICOQUIMICA

CECILIA, JUAN A.; MAIA MONTAÑA; LICK, ILEANA D.; ENRIQUE RODRIGUEZ CASTELLÓN; ELENA RODRIGUEZ-AGUADO; CASELLA, MÓNICA L.

Natal

Congreso; XXVIII CONGRESSO IBERO-AMERICANO DE CATÁLISE; 2022

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This paper presents results of activity and regeneration of Ag/CaO-Al catalysts for the removal of acetic acid, one of the main molecules that generate acidity in bio-oils.At first, gamma-Al2O3- supports catalysts containing 20 wt% CaO were prepared (CaO-Al), and later the oxidic support was modified in order to obtain metallic systems based on silver with two concentration levels, 1 and 10 wt% (1Ag/CaO-Al and 10Ag/CaO-Al).Catalysts were activated by reduction in H2(g) to obtain the Ag(0) phase. The acetic acid elimination reaction was carried out in a batch reactor and an elimination of 94.4 and 97.5% was achieved for the 1Ag/CaO-Al and 10Ag/CaO-Al catalysts, respectively. However, carbonaceous deposits are formed on the catalytic surface, causing a decrease in the activity.By carrying out a two-step regeneration process, a calcination stage followed by a reduction stage, the catalysts recover a high level of activity. It is proposed, based on data obtained through various characterization techniques, that the treatment in an oxidizing atmosphere allows the elimination of a high percentage of the carbonaceous phases, while the subsequent reducing treatment activates the supported metallic phases again.