Characterization and acidic properties of Al-SBA-3 mesoporous material

Anunziata, Oscar A.; Martínez, María Laura; Costa, Marcos B. Gómez

doi:10.1016/j.matlet.2009.11.072

Cited by 30 publications

(36 citation statements)

References 10 publications

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“…The spectra of all samples show additional features in the vicinity of the $1085 and 805 cm À1 stretching bands, whose absorption frequency shifted upward after ball milling relative to pristine sample. These features can be assigned to more M-O-Si bending vibrations, indicating incorporation of hetero-atom into the clay-silica matrix [36]. The low frequency of the hydroxyl site in H-KB-Ca is explained in terms of a hydrogen-bonding perturbation of the corresponding proton by interaction with the framework oxygen atoms.…”

Section: Dehydration Methodsmentioning

confidence: 92%

The performance of chemically and physically modified local kaolinite in methanol dehydration to dimethyl ether

Solyman

Betiha

2014

Egyptian Journal of Petroleum

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The catalytic activity of modified natural kaolinite as a solid acid catalyst for dimethyl ether (DME) preparation was investigated by following up the conversion% of methanol and the yield% of DME. Natural kaolinite (KN) was treated chemically with H 2 O 2 (KT) followed by thermal treatment at 500°C (KC) and then mechano-chemically by ball milling with and without CaSO 4 (KB-Ca and KB, respectively). These samples were characterized by XRD, FTIR, SEM, HRTEM, TGA and NH 3 -TPD techniques. The different techniques showed that the chemical treatment of kaolinite with H 2 O 2 resulted in partial exfoliation/delamination of kaolinite, decreased the amount of acidic sites which is accompanied by increasing their strength. Calcination only decreased the acidic strength and slightly enlarged the particle size mostly due to heat effect. Ball milling resulted in multitude randomly-oriented crystals and increased the amount of acidic sites with the same strength of KT sample. CaSO 4 mostly produced ordered monocrystalline kaolinite and created new acidic sites with slightly lower strength relative to KB. The catalytic activity and selectivity depend on the reaction temperature, the space velocity and the strength of acid sites. The most active sample is KB-Ca, which gives 84% DME due to its high amount and strength of acidic sites. The different modification methods resulted in 100% selectivity for DME. ª 2014 Production and hosting by Elsevier B.V. on behalf of Egyptian Petroleum Research Institute.

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Section: Dehydration Methodsmentioning

confidence: 92%

The performance of chemically and physically modified local kaolinite in methanol dehydration to dimethyl ether

Solyman

Betiha

2014

Egyptian Journal of Petroleum

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“…3, it can be found that both Lewis and Brønsted acidic sites increase with Al contents. It was well documented that there was no B acid sites observed in the spectrum of pure SBA-15 [41][42][43]. Hence, it can be concluded that the Brønsted acid sites are generated due to the presence of Zr and Al in the framework of SBA-15.…”

Section: Pyridine Adsorption Irmentioning

confidence: 89%

“…3. According to the literatures [34,[39][40][41][42][43], bands at 1445 and 1595-1602 cm À1 can be assigned to the hydrogen-bonded pyridine. The bands at 1450 and 1620 cm À1 are attributed to the pyridine adsorbed onto Lewis acidic (L) sites, and the bands at 1545 and 1638 cm À1 are assigned to the pyridine adsorbed onto Brønsted (B) acidic sites, while the band at 1490 cm À1 is ascribed to the pyridine adsorbed onto both B and L acid sites.…”

Section: Pyridine Adsorption Irmentioning

confidence: 99%

Short-channeled mesoporous Zr–Al-SBA-15 as a highly efficient catalyst for hydroxyalkylation of phenol with formaldehyde to bisphenol F

Wei

Tan

et al. 2016

Chemical Engineering Journal

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“…One of the appropriate methods for the preparation of such sorbent is embedding of proper metal oxides such as ZnO (active part) on silicate mesoporous materials [43][44][45][46]. Three-dimensional mesoporous materials are good candidates for this goal [47][48][49][50][51]. SBA-3 has a peculiar bimodal pore system, same as SBA-15, but can be synthesized in two hours instead of two days [52].…”

Section: Introductionmentioning

confidence: 99%

H2S Removal Using ZnO/SBA-3: New Synthesis Route and Optimization of Process Parameters

2017

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Abstract. H 2 S is a major toxic compound that could be found in air, water, and fossil fuels and causes some bad e ects such as acidic rain and corrosion. In the present work, SBA-3 (Santa Barbara University no. 3) with three di erent weight percentages of ZnO, namely, 5%, 10%, and 15%, was synthesized via an in situ approach. All synthesized samples were characterized using atomic absorption spectrometry, X-Ray Di raction (XRD), nitrogen adsorption, and Transmission Electron Microscopy (TEM). The obtained results from XRD and nitrogen adsorption con rmed that all the samples almost retained their ordered structure after incorporation of ZnO nanoparticles within the mesopores of SBA-3. TEM images showed that ZnO nanoparticles were arranged along the direction of mesopores of SBA-3. Then, adsorption of H2S from a model gas was investigated. A three-factor Box-Behnken design with ve center points and one response was performed for the evaluation of e ect of three process parameters, namely, ZnO wt%, space velocity, and temperature, on the adsorption of H 2 S and a quadratic model (r 2 : 0.9185) was developed to navigate the design space. Temperature had the largest and space velocity had the lowest e ect on the breakthrough of H 2 S. The optimum breakthrough time (t bp ) was 588 min.

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Characterization and acidic properties of Al-SBA-3 mesoporous material

Cited by 30 publications

References 10 publications

The performance of chemically and physically modified local kaolinite in methanol dehydration to dimethyl ether

The performance of chemically and physically modified local kaolinite in methanol dehydration to dimethyl ether

Short-channeled mesoporous Zr–Al-SBA-15 as a highly efficient catalyst for hydroxyalkylation of phenol with formaldehyde to bisphenol F

H2S Removal Using ZnO/SBA-3: New Synthesis Route and Optimization of Process Parameters

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