Exploring a new preparation pathway for the synthesis of silica based xerogels as crack-free monoliths

Çok, Selay Sert; Koç, Fatoş; Balkan, Firuz; Gi̇zli̇, Nilay

doi:10.1016/j.ceramint.2018.10.038

Cited by 17 publications

(7 citation statements)

References 28 publications

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“…6b and c). Figures 5b, c, d, e, f and g 6d also shows the formation of open pores presenting a continuous channel of communication with sample external surface (d ~ 74 nm, indicated by yellow arrows) as described in literature [40,52].…”

Section: Morphological Analysis (Sem/tem)supporting

confidence: 63%

“…An excess of IL could clog the porous silica network channels preventing the CO 2 or propylene oxide to access these channels [51]. Also, the excess of ILs in the synthesis of SXs could bring fragileness to the porous silica network [52,56]. The SX-EMIM MSO 3 demonstrated the same trend presented by SX-BMIM Cl, but with better results for an increase in ILs concentration.…”

Section: Synthesis Of Propylene Carbonatementioning

confidence: 86%

“…5e-h. As seen in Fig. 5i the xerogel synthesized without ILs addition presents a dense appearance due to gel shrinkage during the solvent evaporation step [52]. In xerogels synthesized with different concentrations of the ILs BMIM Cl and EMIM MSO 3 (a-h), agglomerated spheres that increase in size with the increasing concentration of IL contained in xerogels were formed.…”

Section: Thermogravimetric Analysismentioning

confidence: 93%

“…The IL presences make it difficult for the spheres to collapse during solvent evaporation, avoiding shrinkage and formation of a dense structure as shown in Fig. 5i for pristine SX [40,52,53].…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

“…) attributed to the IL confinement and also open pores in the SX structure (Indicated by yellow arrows)[40,52,54].…”

mentioning

confidence: 99%

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Imidazolium-based ionic liquid silica xerogel as catalyst to transform CO2 into cyclic carbonate

et al. 2020

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In this work silica xerogel samples containing different imidazolium ILs (EMIM-CF 3 SO 3 , EMIM-MSO 3 , BMIM-Cl, MBMIM-TF 2 N, BMIM-TF 2 N and EMIM-TF 2 N) were synthesized, characterized and used as catalyst in cyclic carbonate synthesis. ILs mass percentage was varied from 5% to 25%. The effect fostered by the ILs mass variation in the synthesis of silica xerogel was observed both in the materials characterization as well as in the performance of these materials as solid catalysts in the cyclic carbonate synthesis from the cycloaddition reaction of CO 2 with propylene epoxide. The obtained silica xerogel samples (SXs) were characterized by FTIR, RAMAN, TGA, SEM and TEM. The selectivity of the cycloaddition reaction was analyzed by GC and 1 H and 13 C NMR. The best results were obtained for SX-EMIM MSO 3 (20% of IL) and SX-BMIM Cl (15% of IL) with propylene carbonate yields of 91.4% and 83.4% and selectivities >99% and 97.4% respectively.

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Section: Morphological Analysis (Sem/tem)supporting

confidence: 63%