1 Zn-doped ZIF-67 as catalyst for the CO 2 fixation into cyclic carbonates

Zanon, Adriano; Chaemchuen, Somboon; Mousavi, Bibimaryam; Verpoort, Francis

doi:10.1016/j.jcou.2017.05.026

Cited by 99 publications

(54 citation statements)

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“…Various kinds of catalysts, such as metal oxides 9 , molecular sieves 10 , metal-organic frameworks [11][12][13] , ion-exchange resins 14 , nanoparticles 3,15 , ionic liquids 16 , functionalized polymers 17 , biopolymer-supported catalysts 18 , and metal complexes including aluminum, 19-21 zinc 22,23 chromium 24,25 , iron 26,27 , tin 28 and vanadium, etc. [29][30][31] , have been investigated for this reaction.…”

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confidence: 99%

Chemical fixation of carbon dioxide catalyzed via cobalt (III) ONO pincer ligated complexes

et al. 2019

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Chemical insertion of carbon dioxide into epoxides under ambient conditions has become one of the most important methods for the construction of cyclic organic carbonates. Various active salen, salophen, and phenolate ligand based complexes have been reported for the synthesis of cyclic organic carbonates. Here we demonstrate a series of ONO pincer type cobalt (III) complexes as efficient catalysts for the cycloaddition of carbon dioxide to epoxides in neat conditions at atmospheric pressure with and without co-catalyst. A turnover number of up to 200,000 under atmospheric pressure is achieved. Moreover, the in situ generated complex shows high activity and the catalyst can be reused for at least 11 cycles without any decline in catalytic performance.

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confidence: 99%

Chemical fixation of carbon dioxide catalyzed via cobalt (III) ONO pincer ligated complexes

et al. 2019

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“…linked by imidazole ligands, which have attracted extensive interest since the original report by Yaghi and co‐workers . High porosity originating from high crystallinity and regular topology structure makes ZIFs one of the best porous materials for the selective capture of CO 2 . The outstanding chemical and thermal stability of ZIFs are also favorable for its application under harsh conditions .…”

Section: Introductionmentioning

confidence: 99%

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO₂ Adsorption

Guo

Zhu

et al. 2019

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The synthesis of HCSs based core-shell structured nanocomposite can offer many benefits and potential applications. First, the remarkable durability stemming from the carbon framework would be highly beneficial for enduring harsh reaction conditions including acidic, alkaline, and organic regent. [4] Secondly, meso-/ micropores distributed on the surface of carbon shell can provide pathways for the diffusion of mass, which would reduce the diffusion resistance. [6] Last but not the least, the presence of huge inner space of HCSs with respect to the volume of carbon shell itself affords a huge reaction site. Therefore, it is important to experimentally and theoretically investigate the inner space of HCSs-based nanocomposites with controllable sizes for their optimum utilization.Zeolitic imidazole frameworks (ZIFs) with tetrahedral network topologies are a subclass of metal-organic frameworks (MOFs) composed of transition metals (Co, Cu, Zn, etc.) linked by imidazole ligands, which have attracted extensive interest since the original report by Yaghi and co-workers. [16,17] High porosity originating from high crystallinity and regular topology structure makes ZIFs one of the best porous materials for the selective capture of CO 2 . [18][19][20][21][22][23][24][25][26][27] The outstanding chemical and thermal stability of ZIFs are also favorable for its application under harsh conditions. [28][29][30][31][32][33][34][35] It is well established that the surface-to-volume ratio and total porosity of ZIFs are inversely related to its size, and have a significant influence on the adsorption capacity. [36,37] In this regard, reducing ZIFs to nanoscale size is favorable for increasing specific surface area and total porosity as well as enhancing uptake and selectivity.In this context, we report the synthesis of ZIF-67@HCSs material via a space-confined strategy, and its application for CO 2 capture. The as-synthesized ZIF-67@HCSs exhibited a unique core-shell structure composed of single microporous carbon shell and several nanoscale ZIF-67 cores. Due to the nanoconfined environment inside HCSs, these nanoreactors outperformed the conventional solution-based synthesis. [38] The results showed that:(1) the huge inner space of HCSs could be fully utilized without volume expansion, thus enhancing the tap density; (2) spaceconfined synthesis could control the size and morphology of ZIF-67 nanoparticles; (3) high chemical and thermal stability of ZIF-67 nanoparticles protected by hydrophobic carbon shell can avoid the moisture effects for real postcombustion gas separation, and therefore enhance the long-term stability. As expected, the ZIF-67@HCSs endowed with controlled morphology and high porosity exhibited outstanding adsorption capacity for CO 2 .Herein, the design and synthesis of ZIF-67 nanoparticles (NPs) with tunable size grown inside hollow carbon nanospheres (ZIF-67@HCSs) via a space-confined strategy is reported. HCSs are first prepared via pyrolysis of polystyrene@polypyrrole (PS@PPy) composite nanospheres. Furthe...

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“…For example, in case the catalyst contains both Lewis acid and basic sites, it is accepted that the acidic site activates the epoxide. In contrast, the basic site activates the carbon dioxide [53]. On the other hand, the co-catalyst is the source of the basic site for the reaction when the catalyst provides the Lewis acidic site only.…”

Section: Catalytic Mechanismmentioning

confidence: 99%

“…Catalysts 2020, 10, x FOR PEER REVIEW 9 of 14 activates the carbon dioxide [53]. On the other hand, the co-catalyst is the source of the basic site for the reaction when the catalyst provides the Lewis acidic site only.…”

Section: Catalytic Mechanismmentioning

confidence: 99%

MIL-101(Cr) for CO2 Conversion into Cyclic Carbonates, Under Solvent and Co-Catalyst Free Mild Reaction Conditions

et al. 2020

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Mild reaction conditions (nearly room temperature and atmospheric CO2 pressure) for the cycloaddition of CO2 with epoxides to produce cyclic carbonates were investigated applying MIL-101(Cr) as a catalyst. The MIL-101 catalyst contains strong acid sites, which promote the ring-opening of the epoxide substrate. Moreover, the high surface area, enabling the adsorption of more CO2 (substrate), combined with a large pore size of the catalyst is essential for the catalytic performance. Additionally, epoxide substrates bearing electron-withdrawing substituents or having a low boiling point demonstrated an excellent conversion towards the cyclic carbonates. MIL-101(Cr) for the cycloaddition of carbon dioxide with epoxides is demonstrated to be a robust and stable catalyst able to be re-used at least five times without loss in activity.

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1 Zn-doped ZIF-67 as catalyst for the CO 2 fixation into cyclic carbonates

Cited by 99 publications

References 81 publications

Chemical fixation of carbon dioxide catalyzed via cobalt (III) ONO pincer ligated complexes

Chemical fixation of carbon dioxide catalyzed via cobalt (III) ONO pincer ligated complexes

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO₂ Adsorption

MIL-101(Cr) for CO2 Conversion into Cyclic Carbonates, Under Solvent and Co-Catalyst Free Mild Reaction Conditions

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1 Zn-doped ZIF-67 as catalyst for the CO 2 fixation into cyclic carbonates

Cited by 99 publications

References 81 publications

Chemical fixation of carbon dioxide catalyzed via cobalt (III) ONO pincer ligated complexes

Chemical fixation of carbon dioxide catalyzed via cobalt (III) ONO pincer ligated complexes

Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO2 Adsorption

MIL-101(Cr) for CO2 Conversion into Cyclic Carbonates, Under Solvent and Co-Catalyst Free Mild Reaction Conditions

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Space‐Confined Synthesis of ZIF‐67 Nanoparticles in Hollow Carbon Nanospheres for CO₂ Adsorption