CuO immobilized paper matrices: A green catalyst for conversion of CO2 to cyclic carbonates

Aggrawal, Sudiksha; Sharma, Raksha; Mohanty, Paritosh

doi:10.1016/j.jcou.2021.101466

Cited by 14 publications

(3 citation statements)

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“…Consequently, a quicker technique via ultrafast microwaveassisted immobilization of metal oxides on cellulose fibers was introduced. 37,38 The immobilization of metal oxide nanoparticles on cellulose fibers within 5 min is carried out due to the formation of a permanent covalent bond M−OC− between the hydroxyl groups of metal and cellulose fibers. 38 This permanent covalent bond formation between the metal nanostructures and cellulose fibers reduces the probability of leaching, which makes this method more appropriate to prevent catalyst poisoning during the experiment.…”

Section: D-mentioning

confidence: 99%

“…After that, the carbinolamine intermediate followed a decomposition step similar to the mechanism reported by Ciaccia and Stefano 45 and Hall and Smith. 65 The presence of basic sites of CuO on the CP catalyst 37 favors the rapid formation of the C− N bond with proton transfer. Hall and Smith 65 predicted a mechanism of imine synthesis between methylamine and formaldehyde through a four-membered transition state by theoretical ab initio calculations.…”

Section: Reaction Mechanismmentioning

confidence: 99%

“…Thus, cellulose paper could be an excellent substrate used to immobilize metal nanoparticles. , Our research group has already made significant progress in this direction by developing a unique hydrothermal technique that immobilizes various metal oxides (ZnO, TiO 2 , Ce 2 O 3 , Bi 2 O 3 , and Fe 2 O 3 ) on cellulose fibers without the need for linker, binder, or retention aid. − However, the immobilization caused by that hydrothermal process takes more time (a few hours to days). Consequently, a quicker technique via ultrafast microwave-assisted immobilization of metal oxides on cellulose fibers was introduced. , The immobilization of metal oxide nanoparticles on cellulose fibers within 5 min is carried out due to the formation of a permanent covalent bond M–OC– between the hydroxyl groups of metal and cellulose fibers . This permanent covalent bond formation between the metal nanostructures and cellulose fibers reduces the probability of leaching, which makes this method more appropriate to prevent catalyst poisoning during the experiment.…”

Section: Introductionmentioning

confidence: 99%

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CuO Immobilized Cellulose Paper as a Green Catalyst for the Acid/Base-Free Synthesis of Imines via a Nonconventional Approach

Prajapati,

Rawat,

Aggrawal

et al. 2024

ACS Appl. Eng. Mater.

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Immobilization of 12 wt % of cupric oxide (CuO) nanoflakes (width 55−150 nm and length up to 235 nm) on fibers of cellulose in paper was conducted by an ultrafast (30 min only) microwave-assisted method at 80 °C without using any binder, linker, or retention aid. The synthesized material proves to be a highly efficient heterogeneous catalyst for the acid/base-free synthesis of imines by the nonconventional solvothermal method. The catalytic conversion of aromatic aldehydes (1 mmol) and aniline (1.5 mmol) was carried out within 60 min at 100 °C with only 2 mL of THF, resulting in 96% yield of N-benzylideneaniline with a moderate TON of 64. The product yield was estimated to be 23 and 72% when blank cellulose paper (without CuO) and CuO nanoflakes, respectively, were used, supporting the role of hydroxyl groups of cellulose in imine formation. The catalyst exhibited remarkable recyclability with 97% of its catalytic activity retained even after five consecutive cycles. Importantly, the catalyst was separated from the reaction mixture simply by using forceps without any filtration or centrifugation processes.

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Section: D-mentioning

confidence: 99%