Isomerization of d-glucose to d-fructose over metallosilicate solid bases

Lima, Sérgio; Dias, Ana S.; Lin, Zhi; Brandão, Paula; Ferreira, Paula; Pillinger, Martyn; Rocha, João; Casilda, Vanesa Calvino; Valente, Anabela A.

doi:10.1016/j.apcata.2007.12.030

Cited by 103 publications

(90 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is consistent with the only value of BET surface area found in literature of 7 m 2 /g. [20] The seeded material obtained after 6 h of hydrothermal synthesis (sample E) has a BET surface area of 13.0 Ϯ 0.1 m 2 /g. Activation of UZAR-S2 was carried out by HCl extraction.…”

Section: Samplementioning

confidence: 99%

Synthesis, Swelling, and Exfoliation of Microporous Lamellar Titanosilicate AM‐4

et al. 2011

View full text Add to dashboard Cite

AM‐4 is a layered porous titanosilicate built from TiO6 and SiO4 polyhedra. An improved synthesis of AM‐4 crystalsenabling control of particle size by secondary growth and reducing synthesis time is presented. A new material, UZAR‐S2, has been obtained by exfoliation of the smaller AM‐4. The exfoliation consists of proton exchange with acetic acid, intercalation with nonylamine, and final activation by washing with HCl/water/ethanol. Besides XRD, TEM, N2 adsorption, FTIR, and UV/Vis characterization highlighting the delaminated character of UZAR‐S2, CO2 adsorption was also measured.

show abstract

Section: Samplementioning

confidence: 99%

Synthesis, Swelling, and Exfoliation of Microporous Lamellar Titanosilicate AM‐4

et al. 2011

View full text Add to dashboard Cite

show abstract

“…In the case of magnesium oxide, high glucose conversions (62-67%) are reached after 1h of reaction at 100°C, which were even higher than the equilibrium glucose conversion at 100°C (57% [21]), but with low fructose selectivities (38-44%) [35]. On the other hand, hydrotalcites, alkaline-exchanged zeolites and metallosilicates have demonstrated not only reasonable activity but also high selectivity to fructose (60 to 86%) under similar operating conditions [28][29][30][31][32]36].…”

Section: Introductionmentioning

confidence: 96%

“…Heterogeneous catalysts tested for the isomerisation of glucose into fructose are mostly basic solid materials such as hydrotalcites [28][29][30][31], alkaline-exchanged zeolites [28,30,32], anionexchanged resins [33], mesoporous ordered molecular sieves of the M41S family [34], magnesium oxide [35] and metallosilicate solid bases [36]. Temperatures below 120°C are usually used in order to avoid secondary transformations, and water is commonly selected as solvent.…”

Section: Introductionmentioning

confidence: 99%

Glucose isomerisation into fructose over magnesium-impregnated NaY zeolite catalysts

Graça

Iruretagoyena

Chadwick

2017

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

“…7 Compared to the well-understood Brønsted acidity in zeolites, 8 the nature and reactivity of basic sites in these materials remain a subject of debate. In ETS-10, one identifies octahedral Ti 4+ ions besides tetrahedral framework Si 4+ ions.…”

Section: Introductionmentioning

confidence: 99%

Structure and Basicity of Microporous Titanosilicate ETS-10 and Vanadium-Containing ETS-10

et al. 2012

View full text Add to dashboard Cite

ETS-10 has attracted considerable attention as a base catalyst. It is desirable to confirm the location of basic sites. Vanadium-substituted ETS-10 also attracts much attention for the interesting feature that the Ti can be fully replaced by V without changing its topology. It is important to characterize the local environment upon V substitution for understanding the property and reactivity of ETVS-10. The structural and acid−base properties of pure titanosilicate ETS-10 and a series of vanadium-substituted ETVS-10 with different framework V content were studied by a combination of Raman spectroscopy and FTIR of absorbed acetylene and carbon monoxide as molecular probes. The substitution of up to 70% of Ti atoms with V in the structure of ETS-10 results in ETVS-10 materials with a homogeneous distribution of Ti and V species. At higher V concentrations, a distinct phase separation between the vanadium-rich domains is observed. The intrinsic basicity of ETVS-10 as revealed by FTIR spectroscopy of adsorbed C 2 H 2 gradually increases with the increasing V content. It is shown that the specific basicity of the ETS-10 lattice is mainly associated with the presence of highly basic oxygen centers adjacent to the lattice defects. Liquid phase Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate was used as a test reaction to investigate the catalytic reactivity of different basic sites in the synthesized materials. The reactivity of the materials considered in the base-catalyzed Knoevenagel condensation is determined not only by the strength of the basic sites but also by their density. The optimum combination of both factors is achieved for the ETVS-10 material with V/(Ti+V) ratio of 70%.

show abstract

Isomerization of d-glucose to d-fructose over metallosilicate solid bases

Cited by 103 publications

References 35 publications

Synthesis, Swelling, and Exfoliation of Microporous Lamellar Titanosilicate AM‐4

Synthesis, Swelling, and Exfoliation of Microporous Lamellar Titanosilicate AM‐4

Glucose isomerisation into fructose over magnesium-impregnated NaY zeolite catalysts

Structure and Basicity of Microporous Titanosilicate ETS-10 and Vanadium-Containing ETS-10

Contact Info

Product

Resources

About