Hexagonally ordered mesoporous highly acidic AlSBA-15 with different morphology: An efficient catalyst for acetylation of aromatics

Vinu, Ajayan; Justus, Josena; Anand, Chokkalingam; Sawant, Dhanashri P.; Ariga, Katsuhiko; Mori, Toshiyuki; Srinivasu, Pavuluri; Balasubramanian, Veerappan V.; Velmathi, Sivan; Alam, Sher

doi:10.1016/j.micromeso.2008.03.033

Cited by 38 publications

(33 citation statements)

References 38 publications

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“…As known, the reactivity of materials is largely dependent on their structural properties that are determined by the morphological structure and composition Lefferts et al, 1987;Vinu et al, 2008). Accordingly, it is believed that the FeeAl composite oxides prepared with different urea dosages may afford the generation of diverse products during degradation of BDE-47.…”

Section: Characterization Of Feeal Composite Oxidesmentioning

confidence: 99%

Thermal degradation of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) over synthesized Fe–Al composite oxide

Yang

et al. 2016

Chemosphere

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h i g h l i g h t sFeeAl composite oxide materials for BDE-47 degradation were successfully synthesized. Component and morphology of material were controlled by concentration of urea. Distribution of hydrodebromination products are analyzed over different material. Morphology and component might affect degradation pathway. a r t i c l e i n f o a b s t r a c tA series of FeeAl composite oxides were synthesized by the hydrothermal method using different urea dosages and examined towards the degradation of 2,2 0 ,4,4 0 -tetrabromodiphenyl ether (BDE-47) at 300 C. The as-prepared oxides were characterized by field-emission scanning electron microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy. The morphology and composition of the prepared materials could be regulated by controlling the urea concentration. Interestingly, these properties influenced the nature and amount of the hydrodebromination products generated during the degradation of BDE-47. The degradation of BDE-47 over the composite oxide prepared at a urea dosage of 3 mmol generated BDE-17 as the major isomer product, followed by BDE-28/33, -30, and -32, among the tribromodiphenyl ethers (tri-BDEs). Regarding the dibromodiphenyl ethers (di-BDEs) produced, the amount of the isomers decreased in the order of BDE-8/11 > BDE-7 > BDE-15 > BDE-10. And the BDE-1 among monobromodiphenyl was determined. In contrast, over the composite oxides prepared at urea dosages greater than 3 mmol, BDE-28/33 gradually become the major isomer product instead of BDE-17 among tri-BDEs. The amount of the other di-BDEs isomer such as BDE-15 and -10 approach to be comparable to that BDE-8/11. However, regardless of the urea dosage, BDE-47 converted into BDE-75 via an isomerization reaction. Based on these intermediate products identification, a possible hydrodebromination mechanism of BDE-47 over FeeAl composite oxide was comprehensively traced.

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Section: Characterization Of Feeal Composite Oxidesmentioning

confidence: 99%

Thermal degradation of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) over synthesized Fe–Al composite oxide

Yang

et al. 2016

Chemosphere

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“…Recently, the synthesis of acetoveratrole by acetylation of veratrole with acetic anhydride over three-dimensional aluminosilicate of the Al-KIT-5 type as well as hexagonal Al-SBA-15 has been reported [26,27]. Conversion of acetic anhydride of 92% with 100% selectivity to acetoveratrole was achieved over Al-SBA-15, working at 60 • C.…”

Section: Friedel-crafts Acylationmentioning

confidence: 99%

Zeolites as Catalysts for the Synthesis of Fine Chemicals

Climent

Corma

Iborra

2010

Zeolites and Catalysis

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“…Because of its large surface, low diffusion limit, excellent surface condensation ability [5][6][7][8][9][10], the mesoporous material has great potential in adsorption processes, shape separation, high efficient catalysis and nano-equipment applications etc. [11][12][13][14][15][16]. Compared to the simple mechanical mixture between micro-and meso-porous materials, the micro@-meso composite obtained from the chemical means could make their combination truly at nano-scale level [17].…”

Section: Introductionmentioning

confidence: 99%