Lanfredi, Silvania [UNESP]Matos, JuanSilva, Suzane Rosa da [UNESP]Djurado, ElisabethSadouki, Ahmed S.Chouaih, AbdelkaderPoon, Po ShanGonzález, Eduardo René Pérez [UNESP]Nobre, Marcos Augusto de Lima [UNESP]2021-11-232021-11-232020-04-12Applied Catalysis B: Environmental, v. 272, p. 118986, 2020. DOI: https://doi.org/10.1016/j.apcatb.2020.118986.0926-3373http://hdl.handle.net/11449/215186New functional polycation oxide-type catalysts were synthesized by the ultrasonic spray-pyrolysis method. The catalytic activity in the production of fatty acid ethyl esters (FAEE´s) using soybean oil was studied. Catalysts are conformed by nanostructured hollow spheres of low density with a stoichiometric formula Ca1-KxTiCux/2O3. The influence of the substitutional ratio (x) upon the catalytic activity was verified. The Ca1-xKxTiCux/2O3 sample with x=0.3 showed the highest activity with a yield up to 89 % to produce fatty acid ethyl esters (FAEE´s) after 24h reaction using 15wt.% catalysts, 120°C and 40bars. The enhancement in the activity was ascribed to the substitution of the Ca+2 sites by K+ and Ti+4 by Cu+2 and to the hollow morphology favoring a more effective interaction between the soybean oil and the active basic sites of the catalysts.engFAEE´s synthesisCaTiO3-based catalystsUltrasonic spray pyrolysisHollow spheresK- and Cu-dopingArtigoAcesso aberto02397521899179511569816987020833594391909361718172019286007045300000-0002-6432-54080000-0003-1348-85540000-0003-4843-3975