Microporous Nanotubes and Nanospheres with Iron‐Catechol Sites: Efficient Lewis Acid Catalyst and Support for Ag Nanoparticles in CO₂ Fixation Reaction

Abstract

Fe -containing hyper-crosslinked microporous nanotubes (FeNTs) and nanospheres (FeNSs) are synthesized through the reaction of catechol and dimethoxymethane in the presence of FeCl or CF SO H. Both FeNTs and FeNSs demonstrate excellent catalytic activity in Lewis acid catalysis (hydrolysis and regioselective methanolysis of styrene oxide) and tandem catalysis involving a sequential oxidation-cyclization process, which selectively converts benzyl alcohol to 2-phenyl benzimidazole. Apart from Lewis acidity, the FeNTs and FeNSs also showed CO uptake capacities of 2.6 and 2.2 mmol g , respectively, at a pressure of 1 atm and temperature of 273 K. Furthermore, Ag nanoparticles are immobilized successfully on the surfaces of FeNTs and FeNSs by the liquid-phase impregnation method to prepare Ag@FeNT and Ag@FeNS nanocomposites, which show high catalytic activity for the selective fixation of CO to phenylacetylene to yield phenylpropiolic acid at 60 °C and 1 atm CO pressure. Hence, Fe -catechol-containing hyper-crosslinked nanotubes and nanospheres have huge potential not only as Lewis acid catalysts, but also as excellent supports for immobilizing Ag nanoparticles in the design of a robust catalyst for the carboxylation of terminal alkynes, which has wide scope in catalysis and environmental research.

Navigating Copper-Atom-Pair Structural Effect inside a Porous Organic Polymer Cavity for Selective Hydrogenation of Biomass-Derived 5-Hydroxymethylfurfural

“…Porous-Organic-Polymer (POP) nanospheres were developed by anhydrous FeCl3 assisted polymerization reaction accompanied by dimethoxymethane and catechol, with slight modification of previous report. 27 At first 0.2 g of catechol and 0.6 g FeCl3 was stirred in 15 ml dichloroethane in 50 ml two neck round bottom flask at refluxing condition. Dimethoxymethane was charged into the reaction mixture to initiate the polymerization process and reaction was continued to 20h.…”

Recent advances in catalytic conversion of carbon dioxide to propiolic acids over coinage-metal-based catalysts

“…Theoretical calculation shows that the amide groups around silver NPs can effectively capture carbon dioxide, providing an ideal microenvironment for carbon dioxide immobilization and transformation. Furthermore, a variety of silver-based catalyst were developed, such as CTF-DCE-Ag, Ag@FeNT, CeO 2 -Ag, Ag@NOMP, Ag NPs@MCC, Ag/PCNF-700, Ag/MÀCeO 2 , which deliver a message that the size and dispersion of NPs are usually the main factors affecting the performance of catalysts [99][100][101][102][103][104][105].…”

Boosting CO2 Conversion with Terminal Alkynes by Molecular Architecture of Graphene Oxide-Supported Ag Nanoparticles

“…unsatisfied recyclability of catalysts, poor utilization efficiency of catalysts, and low mass transfer rate are main obstacles to further increase the catalytic performance. With regard to building an efficient heterogeneous system, different supports loaded with Ag NPs such as metal-organic frameworks (MOFs), [21][22][23] polymers, [24][25][26] SiO 2 , 27 metal oxide, 28 activated carbon, 29 and covalent organic frameworks (COFs) 30 have been reported, and some other systems such as Ag and Au clusters 31,32 have also been investigated. Nevertheless, several key issues still wait to be addressed.…”