abstract
The composites of heteropolyacids (H3PW12, H3PMo12) incorporated into amine-functionalized silica materials were used for the first time as heterogeneous catalysts in the valorization of glycerol (a major waste from the biodiesel industry) through acetalization reaction with acetone. The polyoxotungstate catalyst H3PW12@AptesSBA-15 exhibited higher catalytic efficiency than the phosphomolybdate, achieving 97% conversion and 97% of solketal selectivity, after 60 min at 25 degrees C, or 91% glycerol conversion and the same selectivity, after 5 min, performing the reaction at 60 degrees C. A correlation between catalytic performance and catalyst acidity is presented here. Furthermore, the stability of the solid catalyst was investigated and discussed.
keywords
FUEL ADDITIVES; SBA-15; REACTIVITY; ACETONE; APTES
subject category
Chemistry; Science & Technology - Other Topics; Materials Science; Physics
authors
Dias, CN; Santos-Vieira, ICMS; Gomes, CR; Mirante, F; Balula, SS
our authors
Isabel Cristina Maia da Silva Santos Vieira
Junior Researcheracknowledgements
S.S.B. thanks FCT/MCTES for supporting her contract positions via the Individual Call to Scientific Employment Stimulus (Ref. CEECIND/00793/2018 and Ref. CEECIND/03877/2018, respectively). C.R.G. thanks FCT (Foundation for Science and Technology, Portugal) within the scope of UIDB/04423/2020 and UIDP/04423/2020. The position held by I.C.M.S.S.-V. (Ref. 197_97_ARH-2018) was supported by national funds (OE), through FCT, I.P., in the scope of the framework contract foreseen in the numbers 4, 5, and 6 of article 23 of the Decree-Law 57/2016 of 29 August, changed by Law 57/2017 of 19 July.