Two novel tetranuclear Yb(III)-based compounds for highly efficient conversion of CO2 to cyclic carbonates

CrystEngComm, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

The butterfly-shaped Yb 4 compounds exhibited efficient catalytic activity for the cycloaddition of CO 2 with epoxides under mild conditions.

Language: Английский

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A Precise Preparation Strategy for 2D Nanoporous Thulium-Organic Framework: High Catalytic Performance in CO₂-Epoxide Cycloaddition and Knoevenagel Condensation

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 22, 2025

Efficient conversion of carbon dioxide (CO2) into high-value chemicals is viewed as one the most promising approaches for solving problem an energy shortage and serious environment pollution. However, design synthesis confined multifunctional catalysts with in situ engineered task-specific sites nanoporous environments remain a complex challenging task due to lack in-depth understanding their structure reaction mechanism. Herein, we report highly robust 2D framework {[Tm(HFPDC)(DMF)2]·DMF·H2O}n (NUC-120) (H4FPDC = 4,4′-(4-(4-fluorophenyl)pyridine-2,6-diyl)diisophthalic acid). The thermally activated host [Tm(HFPDC)]n (NUC-120a) has following two merits: (i) structure, (ii) massive quantity functional sites. Moreover, NUC-120 NUC-120a display high thermal chemical stability, which have been proved by TGA soaking experiments acid–base water organic solvents. Catalytic that NUC-120a, presence n-Bu4NBr cocatalyst could efficiently catalyze coupling CO2 epoxides under comparatively mild conditions. Furthermore, also displays catalytic performance Knoevenagel condensation reactions aldehydes malononitrile, should be because coexisting Lewis acidic basic can separately activate aldehyde malononitrile molecules. Thereby, this work further provides insight desired materials generated using existing suitable secondary building units (SBUs) meticulously regulating growth environments.

Language: Английский

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Fluorine-Functionalized 2D Dysprosium(III)–Organic Framework for Highly Catalyzing the CO2-Epoxide Cycloaddition

Journal of Molecular Structure, Journal Year: 2025, Volume and Issue: 1336, P. 142068 - 142068

Published: March 14, 2025

Language: Английский

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Robust Fluorine-Decorated {Yb₄}-Organic Framework for C₂H₆ Capture and Efficient Catalytic Performance on CO₂-Epoxide Cycloaddition

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: May 8, 2025

Fluorine-functionalized MOFs have excellent unusual properties such as gas adsorption and separation catalysis, but the functionalization of existing ligands self-assembly functionalized remain a challenge. Herein, we report robust fluorine-functionalized nanochannel-based ytterbium(III)-organic framework {(Me2NH2)[Yb4(CFPDA)2(μ2-HCO2)(μ3-OH)2(H2O)2]·4DMF·5H2O}n (NUC-122, H5CFPDA = 4,4'-(4-(4-carboxy-2-fluorophenyl)pyridine-2,6-diyl)diisophthalic acid) with [Yb4(μ3-OH)2(μ2-HCO2)(H2O)2] clusters secondary building units (SBUs). Compared to reported anionic skeleton [Yb4(BDCP)2(μ2-HCO2)(μ3-OH)2(H2O)2]n (NUC-38Yb), void volume NUC-122 (54.1%) is slightly lower than that NUC-38Yb (56.7%), which caused by fluorine atoms on ligand H5BDCP. Because introduction groups, activated NUC-122a displays higher capacity for CO2 along value 117.5 cm3/g (273 K) 63.1 (298 K). Further, has high ethane (C2H6) performance over mixture C2H6/C2H4 selectivity 1.6, enabling purity recycled C2H4 reach 99.99%. Moreover, CO2-epoxide cycloaddition could be efficiently catalyzed under comparatively mild conditions. Under optimal catalytic conditions 0.13 mol % MOFs, 1.69 n-Bu4NBr, 0.7 MPa CO2, 70 °C, 3 h, conversion yield SO SC 26% NUC-38Yb. The should attributed combined diverse functional groups Lewis acidic sites Yb3+, basic -F Npyridine atoms, electrophilic H-bond donors (HBD) μ3-OH μ2-HCO2 moieties. Hence, this work not only reports multifunctional material also provides an in-depth insight into synthetic strategy metal-organic host frameworks.

Language: Английский

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Preparation of Copper-Based Catalysts for Obtaining Methanol by the Chemical Impregnation Method

Materials, Journal Year: 2024, Volume and Issue: 17(4), P. 847 - 847

Published: Feb. 9, 2024

This paper presents the preparation of heterogeneous catalysts for direct hydrogenation process CO2 to methanol. The development modern chemical industry is inextricably linked use catalytic processes. As a result, currently over 80% new technologies introduced in incorporate Since basic factor processes catalysts, studies deepening knowledge regarding nature action and systems, as well their improvement, represent research priority fundamental or applied nature. Cu/ZnO/Al2O3 catalyst synthesis green methanol, using precursors an inorganic (copper nitrate, denoted by Cu/ZnO/Al2O3-1) organic acetate, Cu/ZnO/Al2O3-2) nature, are obtained impregnation that includes two stages: one calcination. methods conditions, physico-chemical properties precursor, play major role behavior catalysts. prepared were characterized atomic adsorption analysis, scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) specific surface area pore size analyses, adsorption, chemisorption vapor (BET).

Language: Английский

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