Effect of basic promoters on porous supported alumina catalysts for acetins production
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A facile strategy for the design of porous supports was obtained by modifying the sol-gel
method followed by the wet impregnation technique. In this respect, herein, the acidity of the
-Al2O3
phase was modulated by adding basic MgO, La2O3 or ZnO promoters to form binary supported
catalysts. The Ni and Co dispersion on the supports associated with their tunable acidity and
morphologies resulted in highly porous supported alumina-based catalysts. The physicochemical
properties of the solids were comprehensively investigated by XRD, textural properties, Raman
and FTIR spectroscopy, SEM-EDS, TEM, EPR and XPS analyses. The catalytic performances in
the esterification of glycerol in the presence of acetic acid (EG) for the acetins production were
evaluated. The highly dispersed NiO and Co3O4 active species on binary porous supports produced
synergistic effects appearing to be the reason for the activity of the solids in the EG reaction. Under
the optimized reaction conditions, NiCo/MgO-Al2O3 was found to be a robust solid with superior
catalytic performance and improved stability in four reaction cycles with 65.0% of glycerol conversion
with an exclusive selectivity of 53% for triacetin. The presence of Co2+/Co3+ and Ni2+ strongly
interacting with the spinel
-Al2O3 and MgAl2O4 phases, the latter having a large number of
lattice oxygen species, was considered another active component besides those of Ni and Co in the
esterification of glycerol.
Como referenciar
BEZERRA, RITA de C.F.; MOTA, GABRIELA; VIDAL, RUTH M.B.; CARMO, JOSE V. do; SARAIVA, GILBERTO D.; CAMPOS, ADRIANA; OLIVEIRA, ALCINEIA C.; LANG, ROSSANO; OTUBO, LARISSA; JIMENEZ, JOSE J.; RODRIGUEZ-CASTELLON, ENRIQUE. Effect of basic promoters on porous supported alumina catalysts for acetins production. Catalysts, v. 12, n. 12, p. 1-23, 2022. DOI: 10.3390/catal12121616. Disponível em: http://repositorio.ipen.br/handle/123456789/33864. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.