A caffeine-based ionic liquid as a novel and eco-friendly catalyst for the synthesis of 1,8-dioxo-octahydroxanthenes under solvent-free conditions

Salami, Masoumeh; Ezabadi, Ali

doi:10.1007/s11164-019-03814-3

Cited by 30 publications

(8 citation statements)

References 43 publications

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“…Photocatalytic oxidation (PCO) has been considered one of the promising and effective techniques for improving IAQ [4]. On the one hand, much work so far has focused on the modi cation of photocatalytic materials [5][6][7][8][9]. On the other hand, considerable research efforts have been dedicated to exploiting various photocatalytic reactors [10,11], since the structure of photocatalytic reactors not only determines the photocatalytic performance but also has an impact on the mass transfer characteristics.…”

Section: Introductionmentioning

confidence: 99%

Optimal design of novel honeycomb photocatalytic reactors for numerical analysis of formaldehyde degradation by CFD modeling

et al. 2023

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As an alternative to the investigation of photocatalysts, it is a potential approach to enhance the photocatalytic performance of the novel photocatalytic reactor by optimizing its geometric structure and reaction conditions. In this work, ve different honeycomb photocatalytic reactors with a de ector and a porous air ow distribution plate were designed and a numerical simulation was performed based on computational uid dynamics (CFD). The simulation results showed that a huge vortex appeared near the entrance of the original model and the velocity distribution inside the reactor was non-uniform, whereas these shortcomings could be effectively overcome when using the 45° de ector model (S-4) compared to the other models. Compared to S-1, the photocatalytic conversion rate of formaldehyde for S-4 was boosted by 7.29% at a ow velocity of 0.04 m s −1 . In addition, it was found that the photocatalytic conversion rate of formaldehyde increased from 55.45-94.73% when the velocity decreased from 0.04 to 0.01 m s −1 , and the photocatalytic removal rate of formaldehyde decreased from 94.73-70.05% as the relative humidity varied from 20-70%. Furthermore, when the irradiance increased from 45 to 265 mW cm −2 , the photocatalytic conversion rate of formaldehyde improved by 10.78%. Overall, this work contributes to the design of the novel honeycomb reactor to acquire the optimized construction of the photocatalytic reactor.

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Section: Introductionmentioning

confidence: 99%

Optimal design of novel honeycomb photocatalytic reactors for numerical analysis of formaldehyde degradation by CFD modeling

et al. 2023

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“…As xanthene synthesis is a catalytic process, the key issue is evolving an effective catalyst that benefits from some features such as high activity, low-cost and reusability. Although various catalysts ranging from ionic liquids to nanoparticles have yet been developed, there are some unaddressed shortcomings and challenges 20 – 24 .…”

Section: Introductionmentioning

confidence: 99%

Bio-assisted synthesized Ag(0) nanoparticles stabilized on hybrid of sepiolite and chitin: efficient catalytic system for xanthene synthesis

Kahangi

Mehrdad

Heravi

et al. 2020

Sci Rep

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In this work, with the use of two natural compounds, chitin and sepiolite clay, a novel covalent hybrid is fabricated and applied as a support for the stabilization of silver nanoparticles with the aid of Kombucha extract as a natural reducing agent. The resultant catalytic system, Ag@Sep-N–CH, was characterized via XRD, TEM, FTIR, ICP, SEM, TGA, UV–Vis and BET. It was found that fine Ag(0) nanoparticles with mean diameter of 6.1 ± 1.8 nm were formed on the support and the specific surface area of the catalyst was 130 m2 g−1. The study of the catalytic performance of Ag@Sep-N–CH for catalyzing synthesis of xanthenes in aqueous media under mild reaction condition confirmed that Ag@Sep-N–CH exhibited high catalytic activity and could promote the reaction of various substrates to furnish the corresponding products in high yields. Moreover, the contribution of both chitin and sepiolite to the catalysis has been affirmed. It was found that hybridization of these two components led to synergistic effects and consequently improved the observed catalytic activity. Notably, the catalyst was recyclable up to several reaction runs.

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“…[ 9 ] The fluorescent dyes such as fluorescein and rhodamine are utilized as a synthetic electrostatic chemosensors and super resolutions bioimaging of different biological samples. [ 10 ] They are also extensively used as photodynamic sensitizers [ 11 ] and also acts as corrosion inhibitors. [ 12 ]…”

Section: Introductionmentioning

confidence: 99%

An expedient and straightforward solvent‐free synthesis of 1,8‐dioxo‐octahydroxanthenes using eco‐friendly aluminized polyborate catalyst

Aute

Kshirsagar

Uphade

et al. 2020

Journal of Heterocyclic Chem

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The present work deals with a catalytic application of aluminized polyborate as a mild solid acid catalyst for multicomponent synthesis of 1,8-dioxooctahydroxanthenes under solvent-free condition at 100 C-110 C. It involves selective domino Knoevenagel-Michael reaction of 1 mole of aromatic aldehyde with 2 moles dimedone. The aluminized polyborate is simply synthesized by using boric acid and aluminum trichloride and characterized by FT-IR, XRD, SEM and EDAX techniques. The mild Lewis acidity, crystalline solid nature, stability and recyclability are significant features of the catalyst. The solvent-free condition, clean reaction profile, inexpensive and non-toxic catalyst, operational simplicity, good to excellent product yields, reduced reaction time and applicability to wide range of substrate are crucial features of this protocol.

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A caffeine-based ionic liquid as a novel and eco-friendly catalyst for the synthesis of 1,8-dioxo-octahydroxanthenes under solvent-free conditions

Cited by 30 publications

References 43 publications

Optimal design of novel honeycomb photocatalytic reactors for numerical analysis of formaldehyde degradation by CFD modeling

Optimal design of novel honeycomb photocatalytic reactors for numerical analysis of formaldehyde degradation by CFD modeling

Bio-assisted synthesized Ag(0) nanoparticles stabilized on hybrid of sepiolite and chitin: efficient catalytic system for xanthene synthesis

An expedient and straightforward solvent‐free synthesis of 1,8‐dioxo‐octahydroxanthenes using eco‐friendly aluminized polyborate catalyst

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