Environment-friendly, co-catalyst- and solvent-free fixation of CO2 using an ionic zinc(ii)–porphyrin complex immobilized in porous metal–organic frameworks

2019 ◽  
Vol 3 (11) ◽  
pp. 2977-2982 ◽  
Author(s):  
Nayuesh Sharma ◽  
Sandeep Singh Dhankhar ◽  
C. M. Nagaraja
Keyword(s):  
Heterogeneous Catalyst ◽  
Metal Organic Frameworks ◽  
Porous Metal ◽  
Solvent Free ◽  
Environment Friendly ◽  
Co Catalyst ◽  
Porphyrin Complex ◽  
Catalyst Free ◽  
Metal Organic

Development of a heterogeneous catalyst composed of a [Zn(ii)NMeTPyP]4+[I−]4 complex immobilized in PCN-224 for environment-friendly, co-catalyst-free fixation of CO2 is reported.

A tri-functional metal–organic framework heterogeneous catalyst for efficient conversion of CO2 under mild and co-catalyst free conditions

2019 ◽  
Vol 55 (95) ◽  
pp. 14347-14350 ◽  
Author(s):  
Dingxuan Ma ◽  
Yaowen Zhang ◽  
Shaoshao Jiao ◽  
Jixin Li ◽  
Kang Liu ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Heterogeneous Catalyst ◽  
Lewis Acid ◽  
Metal Organic Framework ◽  
Catalytic Performance ◽  
Co Catalyst ◽  
Efficient Conversion ◽  
Catalyst Free ◽  
Metal Organic ◽  
Organic Framework

A novel tri-functional MOF catalyst was achieved by PSM method. Because of the synergistic effect of Lewis acid, Brønsted acid and Br− anion, MIL-IMAc-Br− displayed an efficient catalytic performance for CO2 conversion.

scholarly journals Hf-Based UiO-66 as Adsorptive Compound and Oxidative Catalyst for Denitrogenation Processes

Compounds ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 3-14
Author(s):  
Rui G. Faria ◽  
Diana Julião ◽  
Salete S. Balula ◽  
Luís Cunha-Silva
Keyword(s):  
Metal Organic Frameworks ◽  
Reaction Times ◽  
Catalytic Efficiency ◽  
Porous Metal ◽  
Free Medium ◽  
Environment Friendly ◽  
Metal Organic ◽  
Model Diesel ◽  
First Time ◽  
Catalytic Capacity

A series of porous metal–organic frameworks (MOFs) of the UiO-66 family, namely UiO-66(Zr), UiO-66(Hf) and UiO-66(Hf)-NH2, prepared by solvothermal procedures were characterized, and their catalytic efficiency for oxidative denitrification (ODN) was investigated for the first time. Sustainable denitrogenation systems combining adsorption and oxidative catalytic capacity were designed using a model diesel containing two distinct nitrogen compounds (NCs) in a solvent-free medium and using an environment-friendly oxidant (H2O2). An efficient adsorptive denitrogenation process was only achieved after long reaction times (24 h): using the Hf-based MOFs, the adsorptive denitrogenation increased from 19% to 79% at 5 to 24 h, while the UiO-66(Zr) reached 76% after 24 h, although the absence of adsorption capacity after 5 h. UiO-66(Hf) and UiO-66(Hf)-NH2 also revealed superior oxidative catalytic denitrogenation than UiO-66(Zr), attaining 97% of efficiency instead of 80%. ODN processes demonstrated to be more effective than the adsorptive denitrogenation, mainly during the first hours of the process. In addition, the metal center in the MOF structure had a larger influence than the presence of the amine-functional groups. Hf-based compounds revealed higher denitrogenation efficiency than the UiO-66(Zr) for a shorter reaction time (5 h).

A direct solvent-free conversion approach to prepare mixed-metal metal–organic frameworks from doped metal oxides

2021 ◽  
Vol 57 (29) ◽  
pp. 3587-3590
Author(s):  
Beili Yi ◽  
Haojie Zhao ◽  
Yue Zhang ◽  
Xiaomeng Si ◽  
Guanqun Zhang ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Metal Organic Frameworks ◽  
Solvent Free ◽  
Mixed Metal ◽  
Synthesis Strategy ◽  
Metal Metal ◽  
Metal Organic

We propose a novel solvent-free conversion strategy of Pt–ZnO to Pt-ZIF-8. This synthesis strategy may facilitate the discovery of MMOFs that have not been reported previously.

Structural Design of Mn-Metal–Organic Frameworks toward Highly Efficient Solvent-Free Cycloaddition of CO2

2021 ◽  
Author(s):  
Haonan Lin ◽  
Cheng-Hua Deng ◽  
Xiaohang Qiu ◽  
Xiao Liu ◽  
Jian-Gong Ma ◽  
...  
Keyword(s):  
Structural Design ◽  
Metal Organic Frameworks ◽  
Solvent Free ◽  
Highly Efficient ◽  
Metal Organic

scholarly journals Degradation Mechanism of Porous Metal-Organic Frameworks by In Situ Atomic Force Microscopy

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 722
Author(s):  
Ioanna Christodoulou ◽  
Tom Bourguignon ◽  
Xue Li ◽  
Gilles Patriarche ◽  
Christian Serre ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Degradation Mechanism ◽  
Metal Organic Frameworks ◽  
Porous Metal ◽  
Force Microscopy ◽  
Atomic Force ◽  
Metal Organic ◽  
The Media ◽  
Ph Conditions

In recent years, Metal-Organic Frameworks (MOFs) have attracted a growing interest for biomedical applications. The design of MOFs should take into consideration the subtle balance between stability and biodegradability. However, only few studies have focused on the MOFs’ stability in physiological media and their degradation mechanism. Here, we investigate the degradation of mesoporous iron (III) carboxylate MOFs, which are among the most employed MOFs for drug delivery, by a set of complementary methods. In situ AFM allowed monitoring with nanoscale resolution the morphological, dimensional, and mechanical properties of a series of MOFs in phosphate buffer saline and in real time. Depending on the synthetic route, the external surface presented either well-defined crystalline planes or initial defects, which influenced the degradation mechanism of the particles. Moreover, MOF stability was investigated under different pH conditions, from acidic to neutral. Interestingly, despite pronounced erosion, especially at neutral pH, the dimensions of the crystals were unchanged. It was revealed that the external surfaces of MOF crystals rapidly respond to in situ changes of the composition of the media they are in contact with. These observations are of a crucial importance for the design of nanosized MOFs for drug delivery applications.

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