Vapor phase aldol condensation of methyl acetate with formaldehyde over a Ba–La/Al2O3 catalyst: the stabilizing role of La and effect of acid–base properties

Bao, Qi; Zhu, Wanchun; Yan, Jianbiao; Zhang, Chunlei; Ning, Chunli; Zhang, Yi; Hao, Mengmeng; Wang, Zhenlü

doi:10.1039/c7ra10008f

Cited by 20 publications

(13 citation statements)

References 37 publications

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“…In addition, the divalent copper component was reduced to univalent copper in nitrogen atmosphere, which was consistent with the subsequent XPS (Figure 5b). The wide diffraction peak of crystalline Al 2 O 3 was not found, suggesting that aluminum species entered the skeleton of SBA‐15 or were not detected because of its less content [14] …”

Section: Resultsmentioning

confidence: 98%

“…The wide diffraction peak of crystalline Al 2 O 3 was not found, suggesting that aluminum species entered the skeleton of SBA-15 or were not detected because of its less content. [14] N 2 adsorption/desorption isotherm is shown in Figure 3a. The nanocomposite loaded with metal components and SBA-15 mesoporous molecular sieves were typical IV isotherm with H1 hysteresis loop.…”

Section: The Characterization Of Catalystmentioning

confidence: 99%

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Highly Stable Univalent Copper of a Cu@Al/SBA‐15 Nanocomposite Catalyzes the Synthesis of Fluorescent Aminobenzotriazoles Derivatives

Luo

Tian

Pei

et al. 2021

Chemistry A European J

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With the development of green chemistry, it is still a challenge to maintain the unstable valence state of the metal in heterogeneous catalysts and realize new catalytic synthesis methods. In this paper, it is reported that an univalent copper nanocomposite (Cu@Al/SBA‐15) can efficiently catalyze the formation of novel amino‐containing benzotriazoles with great fluorescence properties in a new synthetic strategy. Subsequently, its application is further verified by an acylation reaction to produce a series of novel benzotriazoles derivatives with high yield. It is worth noting that the Cu@Al/SBA‐15 nanocomposites not only enable the reaction completed with high yield in a short time, but can also be recycled many times without a significant reduction in activity, and the leaching of copper and aluminum species in reaction system is negligible. Finally, the detailed and feasible reaction mechanism is also provided.

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Section: Resultsmentioning

confidence: 98%

Section: The Characterization Of Catalystmentioning

confidence: 99%

Highly Stable Univalent Copper of a Cu@Al/SBA‐15 Nanocomposite Catalyzes the Synthesis of Fluorescent Aminobenzotriazoles Derivatives

Luo

Tian

Pei

et al. 2021

Chemistry A European J

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“…In some cases, this method was applied to deconvolute the experimental curve even in six fixed temperature ranges to get a good fit and a better comparison between samples. [32] Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS)…”

Section: Ammonia Temperature-programmed Desorption (Nh3-tpd) Studiesmentioning

confidence: 99%

“…Here, we employ the same strategy to quantify the acid sites. In some cases, this method was applied to deconvolute the experimental curve even in six fixed temperature ranges to get a good fit and a better comparison between samples [33].…”

Section: (Iii) Inductively Coupled Plasma Analysismentioning

confidence: 99%

Effect of support acidity during selective hydrogenolysis of glycerol over supported palladium–ruthenium catalysts

Guadix-Montero

Santos

Folli

et al. 2020

Phil. Trans. R. Soc. A.

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We report the role of the acidity of support during the selectivity hydrogenolysis of glycerol over supported bimetallic palladium–ruthenium (PdRu) catalysts. The PdRu nanoparticles were supported on a series of metal oxides and zeolitic supports via the modified impregnation method and tested for the liquid-phase hydrogenolysis of glycerol using gaseous hydrogen. The relative acid site densities of selected catalysts were determined by ammonia temperature-programmed desorption and pyridine desorption experiments. Based on these studies, we report a direct correlation between the catalytic activity (conversion and 1,2 propane diol yield) and two different acid sites (strong acid sites and very strong acid sites). Besides zeolite-supported catalysts, TiO 2 supported PdRu nanoparticles exhibit moderate catalytic activity; however, this catalyst shows high selectivity for the desired C–O bond cleavage to produce C3 products over the undesired C–C bond cleavage to produce < C3 products. This article is part of a discussion meeting issue ‘Science to enable the circular economy’.

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“…4 Literature searches prove that many methods such as the sol-gel method and coprecipitation method which are earlier and easier have been successfully used to synthesize nanoparticles, [5][6][7][8][9] but most of these methods are difficult and costly and use harmful chemicals. 10,11 La 3+ as a lanthanide element has various active biological 12 and biomedical 13 applications owing to its unique 4F electron configuration. 14 As a corollary, the concept of "green nanotechnology" emerged with the green synthesis of nanoparticles commencing a new period in nanotechnology and chemistry and having a significant advance in biomedical applications, such as targeted 15 drug delivery, 16,17 gene delivery, 18 hyperthermia, 19 photoablation therapy, 20 bioimaging, 21 and biosensors.…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly and Systematic Study for Synthesis of La3+/α-Al2O3 Nanoparticles: Antibacterial Activity Against Pathogenic Microbial Strains

Moshafi

Ranjbar

Ilbeigi

2019

IJN

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Purpose: In this study, for the first time, new nanoparticles of La 3+ /α-Al 2 O 3 were synthesized with the ultrasonic-assisted hydrothermal method in the presence of honey as an ecofriendly and natural reagent. Methods: The as-synthesized La 3+ /α-Al 2 O 3 nanoparticles were characterized using scanning electron microscopy (SEM), transition electron microscopy (TEM), X-ray diffraction spectroscopy (XRD), energy dispersive X-ray (EDX), UV-visible spectroscopy, and Fourier transform infrared spectroscopy (FTIR) techniques. In this work, we report optimum conditions to synthesize La 3+ /α-Al 2 O 3 nanoparticles as novel material and as a candidate for antibacterial activity in antibacterial drugs. Results and Conclusion: The XRD and SEM micrograph results demonstrate the formation of pure La 3+ /α-Al 2 O 3 nanoparticles with a particle size in the range of 30-80 nm. The synthesis parameters were systematically examined using analysis of variance (ANOVA) through 2k −1 factorial design, and the factors were an assay for product optimization. Various factors such as hydrothermal time, temperature, ultrasound irradiation and interaction between these factors were investigated on the product size of the products. To investigate antibacterial activity of the La 3+ /α-Al 2 O 3 nanoparticles with the minimum inhibitory concentration (MIC) method, different dilutions of nanoparticles as 64,32,16,8,4, 2, 1 and 0.5 μg/mL were dissolved in dimethyl sulfoxide and diluted using distilled water and added to the Mueller-Hinton agar medium containing Escherichia coli, Klebsiella pneumonia, Pseudomonas aeruginosa and Serratia marcescens as gram-negative bacteria and Bacillus subtilis, Staphylococcus aureus, S. epidermidis and Micrococcus luteus as gram-positive bacteria.

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Vapor phase aldol condensation of methyl acetate with formaldehyde over a Ba–La/Al₂O₃ catalyst: the stabilizing role of La and effect of acid–base properties

Abstract: Vapor phase aldol condensation of methyl acetate with formaldehyde was studied over Ba–La/Al2O3 with different amounts of lanthanum catalysts.

Cited by 20 publications

References 37 publications

Highly Stable Univalent Copper of a Cu@Al/SBA‐15 Nanocomposite Catalyzes the Synthesis of Fluorescent Aminobenzotriazoles Derivatives

Highly Stable Univalent Copper of a Cu@Al/SBA‐15 Nanocomposite Catalyzes the Synthesis of Fluorescent Aminobenzotriazoles Derivatives

Effect of support acidity during selective hydrogenolysis of glycerol over supported palladium–ruthenium catalysts

<p>Eco-Friendly and Systematic Study for Synthesis of La<sup>3+</sup>/α-Al<sub>2</sub>O<sub>3</sub> Nanoparticles: Antibacterial Activity Against Pathogenic Microbial Strains</p>

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