Characterization and reactivity of silica-supported bimetallic molybdenum and stannic oxides for the transesterification of dimethyl oxalate with phenol

Ma, Xinbin; Gong, Jinlong; Wang, Shengping; He, Fei; Xia, Yang; Wang, Gang; Xu, Genhui

doi:10.1016/j.molcata.2004.04.022

Cited by 13 publications

(7 citation statements)

References 30 publications

(28 reference statements)

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“…It is interesting that, for SiO 2 , despite low DMO conversion observed (1.7%), 100% selectivity to MPO is obtained. Moreover, as shown previously, catalytic efficiency of metal oxides can be promoted when the formation of AN is suppressed by using SiO 2 as a support (entries 2–10) 16, 29, 43, 44. It is notable that, although TiO 2 support has a small surface area of 4 m 2 /g, the MoO 3 /TiO 2 shows significant activity (59.5% of DMO conversion) and selectivity (88.1%, 11.4% for MPO and DPO, respectively) (entry 11).…”

Section: Resultssupporting

confidence: 52%

Dispersion and catalytic activity of MoO₃on TiO₂‐SiO₂binary oxide support

et al. 2008

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in Wiley InterScience (www.interscience.wiley.com).The authors present results of an investigation into the dispersion of MoO 3 on TiO 2 -SiO 2 composite and its reactivity in transesterification of dimethyl oxalate (DMO) with phenol to produce methyl phenyl oxalate (MPO) and diphenyl oxalate (DPO). They examined the effects of support composition, MoO 3 content, and reaction time on activities of the transesterification. The results show that MoO 3 /TiO 2 -SiO 2 is more active and selective than MoO 3 /TiO 2 , MoO 3 /SiO 2 , and TiO 2 /SiO 2 catalysts in the transesterification reaction. The best catalytic performance is obtained over a 12%MoO 3 /8%TiO 2 -SiO 2 , providing a 71.8% DMO conversion and 59.0%, 40.1% selectivities for MPO and DPO, respectively. Through employing X-ray diffraction and inductively coupled plasma-optic emission spectrometry, they show evidence strongly suggesting that improvement of catalytic reactivity over the TiO 2 -modified SiO 2 support can be ascribed to the enhanced metal oxide support interactions and the increased dispersion capacity of MoO 3 phase. They also present evidence showing that incorporation of TiO 2 in SiO 2 can elevate the monolayer dispersion capacity of MoO 3 on SiO 2 . Thus, they conclude that increased DPO selectivity from MoO 3 /TiO 2 -SiO 2 catalysts can be primarily attributed to the improvement of MoO 3 dispersion and the synergistic effect between amorphous MoO 3 and amorphous TiO 2 .

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Section: Resultssupporting

confidence: 52%

Dispersion and catalytic activity of MoO₃on TiO₂‐SiO₂binary oxide support

et al. 2008

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“…The data indicates the presence of both weak and strong acidic sites in the catalyst. The middle and high‐temperature peaks around 488.3 and 548.7 °C for Sn‐H β , and 484.5 and 549.4 °C for Sn‐dAlH β , respectively, are representative of desorption from Lewis acid sites 60,61 . Table 2 reveals that the impregnation of Sn onto H β resulted in a reduction in total acidity.…”

Section: Resultsmentioning

confidence: 99%

“…Observing Table 1, it is apparent that the specific The t-plot method, V meso = V pore − V micro , external surface area. 60,61 Table 2 reveals that the impregnation of Sn onto Hβ resulted in a reduction in total acidity. Specifically, the total acid sites on Sn-Hβ and Sn-dAlHβ decreased to 1.34 and 2.77 mmol g −1 from 2.85 mmol g −1 .…”

Section: Surface Areas External Surface Area and Pore Volumesmentioning

confidence: 99%

Effect of tunable acidic properties on the selectivity of biofuel candidate 2,5‐bis (propoxymethyl)furan (BPMF) using Sn‐Hβ and Sn‐dAlHβ catalysts

Rana,

Rana

2024

Biofuels Bioprod Bioref

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Abstract2,5‐Bis(propoxymethyl)furan (BPMF) is a potential biofuel candidate but it is difficult to synthesize it selectively. The Lewis acid sites and Brønsted acid sites of the catalyst play a key role BPMF's selectivity. In the present work, the effect of tunable acidic properties such as the Lewis and Brønsted acidity of Sn‐Hβ and Sn‐dAlβ (Sn in dealuminated Hβ) catalysts on the selectivity of BPMF was studied by carrying out one‐pot reductive etherification of 5‐hydroxymethylfurfural (5‐HMF) using 2‐propanol as a hydrogen donor. The catalysts that were prepared underwent analysis using techniques such as temperature‐programmed desorption of ammonia (NH3‐TPD), powder X‐ray diffraction, transmission electron microscopy, pyridine‐IR spectroscopy, Brunauer–Emmett–Teller (BET) surface area measurement, and Fourier transform infrared spectroscopy. Under the optimized reaction conditions, which included a temperature of 150 °C, a catalyst loading of 0.25 g, a reaction time of 4 h, and a concentration of 1 g of 5‐HMF, impressive results were obtained: 93.57% conversion of 5‐HMF and 98.54% selectivity towards BPMF. It was observed that the catalysts remained active for up to five cycles and slight/moderate change was observed in the conversion of 5‐HMF, while the selectivity of BPMF remained intact.

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“…The higher temperature peaks represent desorption the of NH 3 from the Lewis acid sites. 43,44 According to Table 2, it can be said that the impregnation of Zr in Hβ reduced its total acidity. It can be observed that the amount of total acid sites on Zr-Hβ was reduced to 1.28 mmol g −1 from 2.14 mmol g −1 .…”

Section: Resultsmentioning

confidence: 99%

One-pot reductive etherification of 5-hydroxymethylfurfural into biofuel (2,5-bis(propoxymethyl) furan (BPMF)) using mixed catalyst ZrO(OH)₂and Zr-Hβ

Rana

2023

New J. Chem.

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Characterization and reactivity of silica-supported bimetallic molybdenum and stannic oxides for the transesterification of dimethyl oxalate with phenol

Cited by 13 publications

References 30 publications

Dispersion and catalytic activity of MoO₃on TiO₂‐SiO₂binary oxide support

Dispersion and catalytic activity of MoO₃on TiO₂‐SiO₂binary oxide support

Effect of tunable acidic properties on the selectivity of biofuel candidate 2,5‐bis (propoxymethyl)furan (BPMF) using Sn‐Hβ and Sn‐dAlHβ catalysts

One-pot reductive etherification of 5-hydroxymethylfurfural into biofuel (2,5-bis(propoxymethyl) furan (BPMF)) using mixed catalyst ZrO(OH)₂and Zr-Hβ

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Characterization and reactivity of silica-supported bimetallic molybdenum and stannic oxides for the transesterification of dimethyl oxalate with phenol

Cited by 13 publications

References 30 publications

Dispersion and catalytic activity of MoO3on TiO2‐SiO2binary oxide support

Dispersion and catalytic activity of MoO3on TiO2‐SiO2binary oxide support

Effect of tunable acidic properties on the selectivity of biofuel candidate 2,5‐bis (propoxymethyl)furan (BPMF) using Sn‐Hβ and Sn‐dAlHβ catalysts

One-pot reductive etherification of 5-hydroxymethylfurfural into biofuel (2,5-bis(propoxymethyl) furan (BPMF)) using mixed catalyst ZrO(OH)2and Zr-Hβ

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Dispersion and catalytic activity of MoO₃on TiO₂‐SiO₂binary oxide support

Dispersion and catalytic activity of MoO₃on TiO₂‐SiO₂binary oxide support

One-pot reductive etherification of 5-hydroxymethylfurfural into biofuel (2,5-bis(propoxymethyl) furan (BPMF)) using mixed catalyst ZrO(OH)₂and Zr-Hβ