Gadolinium Triflate Immobilized on Magnetic Nanocomposites as Recyclable Lewis Acid Catalyst for Acetylation of Phenols

Rafiaei, Seyed Mahdi; Kim, Ae-Jung; Shokouhimehr, Mohammadreza

doi:10.1166/nnl.2014.1760

Cited by 36 publications

(14 citation statements)

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“…However, while supporting the catalyst can increase their stability, it decreases their reactivity [18]. Although using these catalysts achieved some important criteria of an ideal catalyst, such as reusability and cost effectiveness, significant drawbacks, including low catalytic activity and selectivity, sever reaction conditions, side reaction production and metal species leaching, remained unresolved [19]. Consequently, exploring economical methods to prepare highly reactive, stable, scalable and recyclable heterogeneous catalysts remains as an important issue in the catalysis research field.…”

Section: Open Accessmentioning

confidence: 99%

Magnetically Separable and Sustainable Nanostructured Catalysts for Heterogeneous Reduction of Nitroaromatics

Shokouhimehr

2015

Catalysts

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185

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This review is focused on the strategies and designs of magnetic nanostructured catalysts showing the enhanced and sustainable catalytic performances for the heterogeneous reduction of nitoaromatics. Magnetic catalysts have the benefits of easy recovery and reuse after the completion of the reactions and green chemical processes. Magnetic separation, among the various procedures for removing catalysts, not only obviates the requirement of catalyst filtration or centrifugation after the completion of reactions, but also provides a practical technique for recycling the magnetized nanostructured catalysts. Consequently, discussions will address the methodologies and exemplars for the reusable magnetic composite catalysts. Because the synthesis of ideal magnetic nanostructured catalysts is of primary importance in the development of high-quality sustainable processes, the designs, preparation methods and recyclability of various recoverable magnetic nanostructured catalysts are emphasized. The representative methods and strategies for the synthesis of durable and reusable magnetic nanostructured catalysts are highlighted. The advantages, disadvantages, recyclability and the efficiency of the introduced heterogeneous systems have been explored in the reduction of nitrobenzene derivatives.

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Section: Open Accessmentioning

confidence: 99%

Magnetically Separable and Sustainable Nanostructured Catalysts for Heterogeneous Reduction of Nitroaromatics

Shokouhimehr

2015

Catalysts

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185

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“…These protocols use support to increase the catalytic activity, but our protocol provides good catalytic activity without using any support. It further uses sonication energy at Literature survey reveals that acylation reactions of phenols, alcohols and amines have been carried out using various catalysts such as modified Y zeolites [50], amorphous carbon-silica composites bearing sulfonic acid [51], poly(N-vinylimidazole) [52], sulfonic acid [53], titanocene bis(perfluorooctanesulfonate) [54], RuCl 3 in [bmim][PF 6 ] ionic liquid [55] 4-(N,Ndimethylamino)pyridine hydrochloride [56], NaCo(CO) 4 [57], Ac 2 O-Py/Al 2 O 3 [58], FeCl 2 [59], cobalt(II) salen complex [60], ZnAl 2 O 4 @SiO 2 nanocomposite [61], BiFeO 3 [62], anhydrous NiCl 2 [63], thallium(III) chloride [64], ErCl 3 [65], Gd(OTf) 2 [66], Cu(OTf) 2 [67] and nano CdO [68]. Most of these protocols have several disadvantages like use of additives and surfactants, requirement of co-catalysts, longer reaction times, high catalyst loading and use of homogenous catalysts.…”

Section: Catalytic Application Of γ-Fe 2 O 3 Nanoparticlesmentioning

confidence: 99%

Magnetically separable γ-Fe2O3 nanoparticles: An efficient catalyst for acylation of alcohols, phenols, and amines using sonication energy under solvent free condition

Bhosale

Ummineni

Sasaki

et al. 2015

Journal of Molecular Catalysis A: Chemical

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“…Crystals with a narrow size distribution and moderate micropores retained their conversion longer. Finally, it can be concluded from the FTIR analysis and cata-test that 0.08%Pd0.29%Ir/H-Beta(i) heterogeneous catalyst provided high catalytic activity with low loading level (0.08 wt%), because the Lewis acid catalyst was grafted on the surface of the nanocomposites [81].…”

Section: Catalytic Performance In the Selective Hydrogenation Of Acetmentioning

confidence: 96%

Fine-Tuning Synthesis and Characterization of Mono-Sized H-Beta Zeolite-Supported Palladium-Iridium Nanoparticles and Application in the Selective Hydrogenation of Acetylene

2017

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Abstract:In this research, a mono-sized Beta zeolite support synthesized by the solvothermal method was used in the selective acetylene to ethylene hydrogenation reaction with minimum coke build up on the catalyst surface. Tetrapropylammonium hydroxide (TPAOH), tetrapropylammonium bromide (TPABr), n-butylamine, and morpholine were used as structure direct agents (SDA) in the support to obtain various shapes. The characterization results show that although the Si/(Al + SDA) ratio has no effect on the phase purity of support, it has a remarkable effect on porosity, crystal size, shape, and structure of micropores. After comparing characterization results, the developed support, based on TPAOH, was selected and modified by different metals (Ce, Ir, Ag, and Pd) using the incipient wetness co-impregnation method. Since there is an interaction between selectivity and conversion, the optimum metal content in the synthesized catalysts and reaction condition were determined to achieve the desired acetylene conversion and ethylene selectivity. The physicochemical transformation of the developed optimum catalysts was determined using different techniques. Based on the characterization and cata-test results, the catalyst which contains 0.29% Ir and 0.08% Pd presents a better performance and higher stability compared to the other catalysts due to the moderate size and mono layer dispersion of the metals on the support. The experimental results show that acetylene conversion and ethylene selectivity approach 97% and 92% at 55 • C, respectively.

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Gadolinium Triflate Immobilized on Magnetic Nanocomposites as Recyclable Lewis Acid Catalyst for Acetylation of Phenols

Cited by 36 publications

References 0 publications

Magnetically Separable and Sustainable Nanostructured Catalysts for Heterogeneous Reduction of Nitroaromatics

Magnetically Separable and Sustainable Nanostructured Catalysts for Heterogeneous Reduction of Nitroaromatics

Magnetically separable γ-Fe2O3 nanoparticles: An efficient catalyst for acylation of alcohols, phenols, and amines using sonication energy under solvent free condition

Fine-Tuning Synthesis and Characterization of Mono-Sized H-Beta Zeolite-Supported Palladium-Iridium Nanoparticles and Application in the Selective Hydrogenation of Acetylene

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