Properties of mesoporous Al-SBA-15 from one-pot hydrothermal synthesis with different aluminium precursors and catalytic performances in xylose conversion to furfural

Rakngam, Issaraporn; Osakoo, Nattawut; Wittayakun, Jatuporn; Chanlek, Narong; Pengsawang, Aniwat; Sosa, Narongrit; Butburee, Teera; Faungnawakij, Kajornsak; Khemthong, Pongtanawat

doi:10.1016/j.micromeso.2021.110999

Cited by 32 publications

(38 citation statements)

References 47 publications

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“…. By comparing such intense patterns with those of reported patterns, the crystallisation of Al-SBA-15 via hydrothermal treatment was found to be good [30]. Similar low angle diffraction peaks were observed for metal modified SBA-15, indicating hexagonally ordered mesoporous materials [35,36].…”

Section: Materials Characterizationsupporting

confidence: 65%

“…In the spectra of Al-SBA-15, the template -CH 2 vibrations are clearly seen just below 3000 cm -1 , and the -OH stretching of water and surface silanol (Si-O-H) group is noticed close to 3400 cm -1 . Further, the -OH bending vibration at about 1630 cm -1 is very well-confirmed [30,40]. The intense peak close to 1200 cm -1 is due to framework asymmetric Si-O-Si and Si-O-Al vibrations.…”

Section: Resultsmentioning

confidence: 61%

“…The SEM images of Al-SBA-15 (HT) and Al-SBA-15 (US-1, 3, and 5 h) are displayed in Figure 3. Al-SBA-15 (HT) is tightly packed and highly interconnected, with windows opening from each mesopore into its surrounding silica particles [30]. The SEM image of US (1 h) reveals highly irregular morphologies due to the random growth of crystals in different directions.…”

Section: Resultsmentioning

confidence: 99%

“…Aluminium modified mesoporous materials such as MCM-41, SBA-15, KIT-6, and TUD-1 have been reported as solid acid catalysts for multicomponent reactions, biomass conversion, and Friedel-Craft alkylation/acylation type reactions [29][30][31][32]. Since the aluminium-based silicate meosporous catalyst possesses both Bronsted and Lewis acid sites, it is catalytically active in alkylation type reactions.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic Synthesis of Al-SBA-15 Nanoporous Catalyst for t-Butylation of Ethylbenzene

Prabhu

Sudha

Pachamuthu³

et al. 2022

Journal of Nanomaterials

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Mesoporous Al-SBA-15 ( Si / Al = 25 ) catalysts were synthesised by the ultrasonic (US) irradiation method at different time durations (1, 3, and 5 h) using the pluronic P123 triblock copolymer as a template. The synthesised catalysts were examined in detail by XRD, ICP-AES, N2 adsorption-desorption, SEM, TEM, FT-IR, and TGA characterization techniques. The characterization results reveal that the catalysts possess a well-ordered hexagonal mesoporous structure. The catalytic activity of synthesised materials was investigated in the tert-butylation of ethylbenzene at different reaction conditions, and their identified products are para-tert-butylethylbenzene (p-tert-BEB) and meta-tert-butylethylbenzene (m-tert-BEB). It was found that high ethylbenzene conversion (69%) is achieved at 200°C with high selectivity towards p-tert-butylethylbenzene (80%). The optimum feed ratio (ethylbenzene: t-butyl alcohol) was 1 : 2, and the feed rate was 2 ml/h for high conversion and product selectivity. All these synthesised Al-SBA-15 (US) catalysts are compared with hydrothermally synthesised Al-SBA-15 (HT) at the same reaction conditions.

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Section: Materials Characterizationsupporting

confidence: 65%

Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ultrasonic Synthesis of Al-SBA-15 Nanoporous Catalyst for t-Butylation of Ethylbenzene

Prabhu

Sudha

Pachamuthu³

et al. 2022

Journal of Nanomaterials

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“…They found that Al–SBA-15 with an n (SiO 2 )/ n (Al 2 O 3 ) of 40 possesses a high acid-center density and sustainable acid strength in benzaldehyde conversion. Rakngam obtained Al–SBA-15 with n (SiO 2 )/ n (Al 2 O 3 ) = 50 and found a better xylose conversion and yield of furfural than the pristine SBA-15 . As an improvement, Al–SBA-15 with n (SiO 2 )/ n (Al 2 O 3 ) = 40 obtained by the acid-free procedure exhibited a fast decomposition rate for low-density polyethylene .…”

Section: Resultsmentioning

confidence: 98%

Synthesis of Well-Ordered Mesoporous Aluminosilicates with High Aluminum Contents: The Challenge and the Promise

Yi-xiong

Zhou

et al. 2022

Inorg. Chem.

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has recently emerged as a potential material for the catalytic conversion of large molecules. Usually, SBA-15 has a low content of aluminum due to the conventional acidic synthesis medium. Although a few approaches have been adopted to prepare Al−SBA-15 with a high alumina content, it is still challenging to prepare well-ordered Al−SBA-15 with a high alumina content. Here, we demonstrate a facile synthesis process in neutral mediums for the grafting of Al into the framework of SBA-15. This approach relies mainly on the dissociation of Si−O−Si bonds and the polymerization of Si−O−Si/Al bonds promoted by sodium persulfate (SPS) in neutral mediums. In this way, well-ordered Al−SBA-15 with a high aluminum content and enhanced acidity was obtained. Results of X-ray fluorescence spectroscopy (XRF) showed an n(SiO 2 )/n(Al 2 O 3 ) ratio of 13.7, much lower than that of the conventional sample (21.7) obtained in acidic medium. The characterization results indicated the presence of a wellordered Al-containing mesophase with high hydrothermal stability. Notably, the Al content and the acidity of Al−SBA-15 can be tuned by changing the SPS amount.

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Unraveling Structural and Acidic Properties of Al‐SBA‐15‐supported Metal Phosphates: Assessment for Glucose Dehydration

Rakngam,

Khemthong,

Osakoo

et al. 2023

ChemPlusChem

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5‐hydroxymethylfurfural (5‐HMF) synthesized through glucose conversion requires Lewis acid (L) site for isomerization and Brønsted acid (B) site for dehydration. The objective of this work is to investigate the influence of the metal type of Al‐SBA‐15‐supported phosphates of Cr, Zr, Nb, Sr, and Sn on glucose conversion to 5‐HMF in a NaCl‐H2O/n‐butanol biphasic solvent system. The structural and acid property of all supported metal phosphate samples were fully verified by several spectroscopic methods. Among those catalysts, CrPO/Al‐SBA‐15 provided the best performance with the highest glucose conversion and 5‐HMF yield, corresponding to the highest total acidity of 0.65 mmol/g and optimal L/B ratio of 1.88. For CrPO/Al‐SBA‐15, another critical parameter is the phosphate‐to‐chromium ratio. Moreover, DFT simulation of glucose conversion to 5‐HMF on the surface of the optimized chromium phosphate structure reveals three steps of fructose dehydration on the Brønsted acid site. Finally, the optimum reaction condition, reusability, and leaching test of the best catalyst were determined. CrPO/Al‐SBA‐15 is a promising catalyst for glucose conversion to high‐value‐added chemicals in future biorefinery production.

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Properties of mesoporous Al-SBA-15 from one-pot hydrothermal synthesis with different aluminium precursors and catalytic performances in xylose conversion to furfural

Cited by 32 publications

References 47 publications

Ultrasonic Synthesis of Al-SBA-15 Nanoporous Catalyst for t-Butylation of Ethylbenzene

Ultrasonic Synthesis of Al-SBA-15 Nanoporous Catalyst for t-Butylation of Ethylbenzene

Synthesis of Well-Ordered Mesoporous Aluminosilicates with High Aluminum Contents: The Challenge and the Promise

Unraveling Structural and Acidic Properties of Al‐SBA‐15‐supported Metal Phosphates: Assessment for Glucose Dehydration

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