Deactivation of Cu3(BTC)2 in the Synthesis of 2-Phenylquinoxaline

Dhakshinamoorthy, Amarajothi; Álvaro, Mercedes; Garcı́a, Hermenegildo

doi:10.1007/s10562-015-1497-4

Cited by 21 publications

(12 citation statements)

References 36 publications

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“…Therefore, an extensive amount of research is required not only to provide new catalysts, but above all to better understand the deactivation processes. Particular effort has to be focused on the analysis of the diffusion and adsorption/desorption processes, which are of utmost importance for porous solid catalysts . Actually, limitations in recyclability often originate from the accumulation of educts/products inside the channels of the crystalline solid, which causes pore blockage .…”

Section: Figuresupporting

confidence: 61%

Batch versus Flow Acetalization of Benzaldehyde with HKUST‐1: Diffusion Pathways and Performance Comparison

et al. 2016

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Understanding the poisoning and deactivation pathways of metal–organic frameworks (MOFs) is an essential goal to boost their application as robust and efficient catalysts in chemical transformations relevant to industrial processes. Herein, the acetalization reaction of benzaldehyde with methanol was investigated by using [Cu3(BTC)2] (BTC=1,3,5‐benzenetricarboxylate) as a catalyst. The reaction was performed under batch and continuous flow conditions, and the conversion of benzaldehyde into 1,1‐dimethoxytoluene proceeded efficiently in the presence of a modest amount of water. Nevertheless, a drastic reduction in the catalytic activity was observed after recycling the MOF for repetitive batch experiments and after prolonged continuous flow tests. Pore clogging of the MOF and partial crystal‐structure modifications, gathered from XRD and pore analyses, suggested grinding the catalyst prior to application; the ground catalyst showed a considerable enhancement in catalytic performance.

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Section: Figuresupporting

confidence: 61%

Batch versus Flow Acetalization of Benzaldehyde with HKUST‐1: Diffusion Pathways and Performance Comparison

et al. 2016

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“…It happens frequently in the literature that the stability of the MOF catalyst is claimed just by giving yields at final reaction times or some specific piece of information without a complete evaluation of the performance and properties of the solid material. 28 Although Cu3(BTC)2 exhibits unique activity compared to analogues MOFs in dehydrogenative coupling of silanes with alcohols 29 and in the synthesis of borasiloxanes by oxidative hydrolysis of silanes and pinacolborane, 30 it is reported to be unstable in the aerobic oxidation of thiols, 31 synthesis of 2phenylquinoxaline 32 and reduction of acetophenone using silane as the reducing agent. 33 The reasons for deactivation or structural damage may be due to the ability of reactants to break the metal-ligand coordination bond.…”

Section: Introductionmentioning

confidence: 99%

Tuneable nature of metal organic frameworks as heterogeneous solid catalysts for alcohol oxidation

2017

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Selective benzyl alcohol oxidation (BA) to benzaldehyde has been frequently used as a benchmark reaction to evaluate the catalytic activity of metal organic frameworks (MOFs) as oxidation catalysts. Substituted BAs, and aliphatic and allylic alcohols have also been often used as substrates in these studies. In the present review, the current state of the art of MOFs as heterogeneous catalysts for the oxidation of BA and other alcohols is described, grouping the reports according to the nature of the active sites present on the MOFs. Thus, MOFs in which the catalytic centres are located at the ligands, at metallic nodes, or at metal nanoparticles (MNPs) incorporated within the MOF pores and photoassisted oxidations have been commented on. The aim of this review is to stress the current limitations encountered in the use of MOFs, particularly with respect to MOF stability and activity and propose new targets in the area.

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“…Moreover, the high metal content in MOFs renders such materials with a highly crystalline structure. However, the low stability of some MOFs under certain reaction conditions makes them unsuitable as efficient catalysts [6]. Therefore, much research has been carried out to overcome the disadvantages of MOFs [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Cu@Cu2O Nanocatalysts by Reduction of HKUST-1 for Oxidation Reaction of Catechol

et al. 2016

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HKUST-1, a copper-based metal organic framework (MOF), has been investigated as a catalyst in various reactions. However, the HKUST-1 shows low catalytic activity in the oxidation of catechol. Therefore, we synthesized Fe 3 O 4 @HKUST-1 by layer-by layer assembly strategy and Cu@Cu 2 O by reduction of HKUST-1 for enhancement of catalytic activity. Cu@Cu 2 O nanoparticles exhibited highly effective catalytic activity in oxidation of 3,5-di-tert-butylcatechol. Through this method, MOF can maintain the original core-shell structure and be used in various other reactions with enhanced catalytic activity.

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Deactivation of Cu3(BTC)2 in the Synthesis of 2-Phenylquinoxaline

Cited by 21 publications

References 36 publications

Batch versus Flow Acetalization of Benzaldehyde with HKUST‐1: Diffusion Pathways and Performance Comparison

Batch versus Flow Acetalization of Benzaldehyde with HKUST‐1: Diffusion Pathways and Performance Comparison

Tuneable nature of metal organic frameworks as heterogeneous solid catalysts for alcohol oxidation

Preparation of Cu@Cu2O Nanocatalysts by Reduction of HKUST-1 for Oxidation Reaction of Catechol

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