Ultrasound and Microwave-Assisted Synthesis of Hexagonally Ordered Ce-Promoted Mesoporous Silica as Ni Supports for Ethanol Steam Reforming

Anno: 2023

Autori: Tovar-Rodriguez J., Fratini E., Baglioni P., Ferrari C., de los Reyes-heredia JA., Ramirez-Hernandez Y., Galindo-Esquivel IR.

Affiliazione autori: Univ Florence, Dept Chem Ugo Schiff, Via Lastruccia 3, I-50019 Florence, Italy; Univ Florence, Ctr Colloid & Surface Sci CSGI, Via Lastruccia 3, I-50019 Florence, Italy; Natl Council Res CNR, Natl Inst Opt INO UOS Pisa, Via Giuseppe Moruzzi 1, I-56124 Pisa, Italy; Metropolitan Autonomous Univ, UAM, Proc Engn & Hydraul Dept, Ave San Rafael Atlixco 186, Mexico City 09340, DF, Mexico; Univ Guanajuato, Chem Engn Dept, Noria Alta S-N, Guanajuato 36050, Mexico.

Abstract: Solvothermal synthesis of mesoporous materials based on amphiphilic molecules as structure-directing agents can be enhanced using non-conventional technologies for stirring and thermal activation. Here, we disclose a green synthesis approach for the preparation of cerium-modified hexagonally ordered silica sieves. Ultrasound micromixing enabled us to obtain well-dispersed Ce in the self-assembled silica network and yielded ordered materials with high cerium content (Ce/Si molar ratio = 0.08). Microwave dielectric heating, applied by an innovative open-end coaxial antenna, was used to reduce the overall hydrothermal synthesis time and to improve the surface area and textural properties. These mesoporous materials were used as a Ni catalyst support (10 wt.% metal loading) for the ethanol steam reforming reaction. The new catalysts featured complete ethanol conversion, high H-2 selectivity (65%) and better stability, compared to the same catalyst prepared with magnetic stirring and conventional heating. The Ce-promoted silica sieves offered a suitable support for the controlled growth of nanocarbon that does not result in catalyst deactivation or poisoning after 6 h on stream.

Giornale/Rivista: NANOMATERIALS

Volume: 13 (6)      Da Pagina: 997-1  A: 997-18

Maggiori informazioni: This research was funded by National Council of Science and Technology CONACYT Mexico (project CB-2010-158193), the Consorzio per lo Sviluppo dei Sistemi a Grande Interfase (CSGI) and Italian Ministry MUR.
Parole chiavi: Cerium catalyst; green chemistry; MCM-41; mesoporous materials; microwave chemistry; nickel catalyst; SAXS
DOI: 10.3390/nano13060997

Citazioni: 5
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18
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