Calcined Dolomite: An Efficient and Recyclable Catalyst for Synthesis of α, β-Unsaturated Carbonyl Compounds

Yang, Hongyuan; Zhang, Tengfei; Zhang, Qi; Zhang, Guangwei; Wang, Peng; Liu, Qing

doi:10.1007/s10562-018-2632-9

Cited by 22 publications

(10 citation statements)

References 28 publications

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“…The endothermic effect that accompanies this decomposition process is wide, asymmetrical, with a minimum at 849.5°C, and a shoulder at 813.8°C. According to data from the literature (Yang et al, 2019), the first to decompose is MgCO3 (endothermic effect at 813.8°C). CaCO3 decomposes at a higher temperature (endothermic effect at 849.5°C).…”

Section: Thermal Analysismentioning

confidence: 99%

Dolomite surface modification with titanium and silicon precursors and its morphostructural and thermal characterisation

Sönmez¹,

Juganaru²,

Ficai³

et al. 2020

Proceedings of the 8th International Conference on Advanced Materials and Systems

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The aim of the paper is to modify the surface of dolomite with titania (TiO2) and silica (SiO2) precursors, in order to use it as a potential reinforcement material in a polymeric matrix or for environmental applications (photocatalyst for the degradation of organic pollutants based on TiO2). The dolomite surface modification was performed by 2 methods. The first method consisted in modifying the direct dolomite surface with SiO2 and TiO2. The second method consisted in the initial treatment of dolomite with TEOS, in order to form silanol bonds, followed by the addition of SiO2 and TiO2 precursors. The obtained powders were characterized by FTIR, SEM-EDS and DSC-TG. The FTIR spectra prove the formation of the silica network while the samples modified with PDMS exhibit the characteristic peaks of methyl groups from PDMS. In EDS, the presence of the characteristic elements of dolomite (calcium, magnesium, oxygen and carbon) can be observed. When analyzing the modified dolomite powders the presence of titanium and silicon can be observed. The characteristic morphology of the dolomite is preserved in all the samples but, the surface of the larger particles is decorated with smaller particles proving the functionalization of the dolomite, according to the two routes. The thermal analysis is characteristic for dolomite-based materials, the main difference between the samples appearing as a consequence of the burning of the organic part of PDMS, which occur between 400 and 600°C.

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Section: Thermal Analysismentioning

confidence: 99%

Dolomite surface modification with titanium and silicon precursors and its morphostructural and thermal characterisation

Sönmez¹,

Juganaru²,

Ficai³

et al. 2020

Proceedings of the 8th International Conference on Advanced Materials and Systems

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“…Figure shows the nitrogen adsorption‐desorption isotherm and pore size distribution curves of the carrier MCF and m PW/MCF catalysts. It is seen that the MCF sample exhibits a typical H1 isotherm with a hysteresis loop exists in the middle and high pressure regions . The foamed mesoporous silica MCF material has spherical channels, whose pore size distribution should be counted using the Broekhoff‐de Boer‐Frenkel‐Halsey‐Hill (BdB) model.…”

Section: Resultsmentioning

confidence: 99%

Three‐Component Mannich Reaction Catalyzed by Mesostructured Cellular Foam Silica Immobilized H₃PW₁₂O₄₀

et al. 2019

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One-pot three-component Mannich reaction was carried out at room temperature using mesocellular cellular foam (MCF) silica loaded H 3 PW 12 O 40 as catalyst. The H 3 PW 12 O 40 /MCF catalyst was prepared by the traditional impregnation method and confirmed by a series of characterizations such as nitrogen adsorption, X-ray diffraction (XRD), Fourier-transform infrared spectra (FT-IR), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The results showed that the H 3 PW 12 O 40 /MCF catalyst with 50 wt% loading of H 3 PW 12 O 40 exhibited the highest catalytic activity for the Mannich reaction of benzaldehyde, aniline and acetophenone with the yield of 94% in 1.8 hours under the optimal condition. In addition, the H 3 PW 12 O 40 /MCF catalyst could be easily recycled and reused four times without significant decline of activity. This work provided an improved modification of the three-component Mannich reaction in terms of efficient activity, mild reaction conditions, clean reaction profiles and a simple workup procedure.

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“…Cotton is an important natural renewable cellulose fiber, widely used in textile industry due to its good hygroscopicity and breath ability. Cotton fabric coatings with nanoparticles exhibit antimicrobial properties, ultraviolet (UV) protection, superhydrophobicity, self-cleaning and flame retardancy (Zhang et al, 2019;. As one of the most important nanomaterial, TiO2 nanoparticles demonstrated efficient photocatalytic activity, chemical stability, biocompatibility, being used in a wide range of applications such as photocatalysis, nanomedicine, textiles, electronic devices, water sanitization (Ahmad Barudin et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Proceedings of the 8th International Conference on Advanced Materials and Systems

2020

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THE ROMANIAN LEATHER MANUFACTURERS ORGANIZATION ROMANIAN LEATHER & FUR PRODUCERS ASSOCIATION 1. Advanced Materials and Nanomaterials 2. Biomaterials and Biotechnologies 3. Innovative Systems, Technologies and Quality Management 4. Ecological Processes for Circular and Neutral Economy 5. Creative Industries and Cultural Heritage 6. Education and DigitalizationWe would like to thank all the participants, the International Scientific Committee, partners and all the sponsors that made this scientific event possible. ICAMS Conference has already become a tradition, contributing to the advancement of Materials Science in research, academic, social and business environments worldwide.

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Calcined Dolomite: An Efficient and Recyclable Catalyst for Synthesis of α, β-Unsaturated Carbonyl Compounds

Cited by 22 publications

References 28 publications

Dolomite surface modification with titanium and silicon precursors and its morphostructural and thermal characterisation

Dolomite surface modification with titanium and silicon precursors and its morphostructural and thermal characterisation

Three‐Component Mannich Reaction Catalyzed by Mesostructured Cellular Foam Silica Immobilized H₃PW₁₂O₄₀

Proceedings of the 8th International Conference on Advanced Materials and Systems

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Calcined Dolomite: An Efficient and Recyclable Catalyst for Synthesis of α, β-Unsaturated Carbonyl Compounds

Cited by 22 publications

References 28 publications

Dolomite surface modification with titanium and silicon precursors and its morphostructural and thermal characterisation

Dolomite surface modification with titanium and silicon precursors and its morphostructural and thermal characterisation

Three‐Component Mannich Reaction Catalyzed by Mesostructured Cellular Foam Silica Immobilized H3PW12O40

Proceedings of the 8th International Conference on Advanced Materials and Systems

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Product

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Three‐Component Mannich Reaction Catalyzed by Mesostructured Cellular Foam Silica Immobilized H₃PW₁₂O₄₀