Aluminium and titanium modified mesoporous TUD-1: A bimetal acid catalyst for Biginelli reaction

Pasupathi, M.; Santhi, N.; Pachamuthu, Muthusamy Poomalai; Mangai, G. Alamelu; Ragupathi, C.

doi:10.1016/j.molstruc.2018.02.009

Cited by 15 publications

(5 citation statements)

References 23 publications

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“…Further, the peaks observed at 1223, 1100 and 803 cm −1 are due (Si-O-Si) asymmetric and symmetric stretching vibrations. The similar type of vibration bands were reported for metal (Co, Sn, Ti, Zr) containing TUD-1 silicates [29][30][31][32]. Noticeably, the vibration bands corresponding for WO 3 in the WO 3 /AlTUD-1catalyst are shielded by the bands of AlTUD-1.…”

Section: Catalyst Characterizationsupporting

confidence: 80%

“…AlTUD-1 and WO 3 /AlTUD-1 exhibits a broad diffraction peak in the 2θ range of 10°-30°, due to the presence of Scheme 2 Synthesis of phenylhydrazones over WO 3 /AlTUD-1 catalyst amorphous silica (SiO 2 ). An absence of alumina peaks in XRD patterns of AlTUD-1, confirmed the complete incorporation of Al 3+ into TUD-1 framework [28,29]. Besides, the XRD patterns of the WO 3 /AlTUD-1 catalyst displayed the minimal diffraction peaks at 23.6°, 33.6° and 54.5° related to WO 3 crystalline species [23,26].…”

Section: Catalyst Characterizationmentioning

confidence: 76%

“…2. According to the IUPAC classification, type IV isotherm with H2 hysteresis loop is exhibited, indicating the characteristic of TUD-1 type wormhole pore architectures [23,26,29]. The steep desorption and sloping adsorption clearly indicate that the presence of interconnected porous networks [26].…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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Tungsten oxide modified AlTUD-1 mesoporous acid catalyst for synthesis of thiazole aryl imines and phenylhydrazones

Rajarajan

Pachamuthu²,

Thirunarayanan

et al. 2019

SN Appl. Sci.

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A non-surfactant route synthesized mesoporous AlTUD-1 (Si/Al = 25) with interconnected porous networks effectively utilized as a support for 10 wt% tungsten oxide (WO 3) dispersions. The synthesized WO 3 /AlTUD-1 catalyst was characterized by different techniques. N 2 sorption and XRD studies were confirmed its amorphous mesoporous nature, which measured a pore diameter of 6.4 nm and a surface area of 510 m 2 g −1. Presence of WO 3 on the pores and silica TUD-1 wormhole structure were evaluated by techniques including DRUV Visible and FT-Raman. The catalyst possessed both Lewis (L) and Brønsted (B) acidity, as measured by pyridine adsorbed FT-IR, which is responsible for the catalyst activity. WO 3 /AlTUD-1 acid catalyst showed an excellent catalytic performance yield of about 80% at 80 °C in reflux condition, for different 1-substituted benzylidene 4-methylbenzo[d]thizole-2-amines (thiazole based aryl imines) and substituted phenylhydrazone compounds.

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Section: Catalyst Characterizationsupporting

confidence: 80%

Section: Catalyst Characterizationmentioning

confidence: 76%

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Tungsten oxide modified AlTUD-1 mesoporous acid catalyst for synthesis of thiazole aryl imines and phenylhydrazones

Rajarajan

Pachamuthu²,

Thirunarayanan

et al. 2019

SN Appl. Sci.

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“…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%

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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“…S2†). 28 Introducing second metals into the Co–Al catalysts did not change the distribution of the Brønsted and Lewis acidic sites, but changed the strength of the Lewis acidic sites (Fig. 3d), which could affect the activity of the Co-based catalysts for the hydrogenation of PET.…”

Section: Resultsmentioning

confidence: 95%

The quantitative conversion of polyethylene terephthalate (PET) and Coca-Cola bottles to p-xylene over Co-based catalysts with tailored activities for deoxygenation and hydrogenation

Shao,

Fan,

Sun

et al. 2023

Green Chem.

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Aluminium and titanium modified mesoporous TUD-1: A bimetal acid catalyst for Biginelli reaction

Cited by 15 publications

References 23 publications

Tungsten oxide modified AlTUD-1 mesoporous acid catalyst for synthesis of thiazole aryl imines and phenylhydrazones

Tungsten oxide modified AlTUD-1 mesoporous acid catalyst for synthesis of thiazole aryl imines and phenylhydrazones

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

The quantitative conversion of polyethylene terephthalate (PET) and Coca-Cola bottles to p-xylene over Co-based catalysts with tailored activities for deoxygenation and hydrogenation

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