Dehydration of glycerol on H-MFI zeolite investigated by FT-IR

Yoda, Eisuke; Ootawa, Ayako

doi:10.1016/j.apcata.2009.03.009

Cited by 79 publications

(68 citation statements)

References 9 publications

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“…All solid-state NMR experiments were carried out on a 600 MHz Varian NMR system equipped with a 3.2 mm Varian HX CPMAS probe. Larmor frequencies for 1 H, 29 Si, and 27 Al nuclei were 599.53 MHz, 119.10 MHz, and 156.22 MHz, respectively. For 27 Al magic-angle spinning (MAS) measurements excitation pulse of 0.8 μs was used, number of scans was 4000 and repetition delay between scans was 0.5 s. Sample rotation frequency was 12.5 kHz.…”

Section: Characterizationmentioning

confidence: 99%

“…The additional peak registered at 275 nm is attributed to the presence of nanosized ZrO2 particles [35], which is more intensive for Zr-modified hierarchical mordenite. 27 Al and 29 Si NMR spectra were used for characterization of the changes of Si/Al ratio after the etching and impregnation procedures. (Table 1) reveal the presence of the weak, strong and moderate acidic sites on the surface of catalysts which were evidenced by the three desorption peaks: 150-300 °C for weak, 300-600 °C for moderate, and above 600 °C for strong acidic sites, respectively.…”

Section: Physico-chemical Propertiesmentioning

confidence: 99%

“…Therefore, employing heterogeneous acid catalysts can contribute to overcome these drawbacks [1,11,[13][14][15][16]. Due to their stronger Brönsted acidity than conventional solid acids like mixed oxides and zeolites, Keggin type heteropolyacids (HPAs) can be employed instead of classical homogeneous acids [17][18][19][20][21][22][23][24][25][26][27][28][29]. Some drawbacks of bulk HPAs like low thermal stability, high solubility in water and polar media and low surface area (1-10 m 2 g −1 ) can be improved by functionalizing them into the framework of high surface area porous supports (silica, activated carbon, zirconia, polymers and acidic ionexchange resin) [11,18,19].…”

Section: Introductionmentioning

confidence: 99%

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Zr-modified hierarchical mordenite as heterogeneous catalyst for glycerol esterification

Popova

Lazarova

Kalvachev

et al. 2017

Catalysis Communications

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Hierarchical mordenite catalysts were prepared by HF and NH4F etching. Materials' zirconia modification was performed by incipient wetness impregnation in order to vary surface acidity type and strength. XRD, N2 physisorption, solid-state NMR and UV-Vis spectroscopies were applied for characterization. Acidic properties of the obtained materials were investigated by TPD of adsorbed ammonia and FT-IR spectra of adsorbed pyridine. Catalytic performance was studied for the glycerol esterification with acetic acid. Zr increased reaction turnover activity compared to raw zeolite substrate due to abundant Brönsted and Lewis moiety presence. The demonstrated biomass valorization processes to bio-based platform chemicals are of interest, as they employ biodiesel production waste.11

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Section: Characterizationmentioning

confidence: 99%

Section: Physico-chemical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Zr-modified hierarchical mordenite as heterogeneous catalyst for glycerol esterification

Popova

Lazarova

Kalvachev

et al. 2017

Catalysis Communications

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“…Various solid acid catalysts, viz. metal phosphates, 8,9,[13][14][15][16] metal sulfates, 17 metal oxides, [17][18][19] supported heteropolyacids (HPAs) 17,[20][21][22][23][24][25][26] and zeolites, 11,17,27,[28][29][30][31][32] have been reported. HPAs with well defined Keggin structures are well-known solid acid catalysts.…”

Section: Introductionmentioning

confidence: 99%

Gas-phase Dehydration of Glycerol over Supported Silicotungstic Acids Catalysts

Kim¹,

Jung²,

Park³

2010

Bulletin of the Korean Chemical Society

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The gas-phase dehydration of glycerol to acrolein was carried out over 10 wt % HSiW catalysts supported on different supports, viz. γ-Al2O3, SiO2-Al2O3, TiO2, ZrO2, SiO2, AC, CeO2 and MgO. The same reaction was also conducted over each support without HSiW for comparison. Several characterization techniques, N2-physisorption, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), the temperature-programmed desorption of ammonia (NH3-TPD), temperature-programmed oxidation (TPO) with mass spectroscopy and CHNS analysis were employed to characterize the catalysts. The glycerol conversion generally increased with increasing amount of acid sites. Ceria showed the highest 1-hydroxyacetone selectivity at 315 o C among the various metal oxides. The supported HSiW catalyst showed superior catalytic activity to that of the corresponding support. Among the supported HSiW catalysts, HSiW/ZrO2 and HSiW/SiO2-Al2O3 showed the highest acrolein selectivity. In the case of HSiW/ZrO2, the initial catalytic activity was recovered after the removal of the accumulated carbon species at 550 o C in the presence of oxygen.

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“…In a previous paper by the authors [4] as well as a few available reviews [5][6][7] gives a good overview of the subject; the classes of catalysts used include: heteropoly acids and other supported inorganic acids [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], zeolites [21,[27][28][29][30][31][32][33], mixed oxides [34][35][36][37][38][39][40][41], and sulphated zirconia [42,43], all of which are solid acid materials. The acids usually contain or are promoted with P, W, S, Mo, and B, Abstract Pore condensation has been suggested as an initiator of deactivation in the dehydration of glycerol to acrolein.…”

Section: Introductionmentioning

confidence: 99%