ZIF-67 as silver-bullet in adsorptive propane/propylene separation

Andrés-García, Eduardo; Oar‐Arteta, Lide; Gascón, Jorge; Kapteijn, Freek

doi:10.1016/j.cej.2018.11.118

Cited by 70 publications

(40 citation statements)

References 34 publications

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“…Indeed, the authors report both plausible gate-opening in the adsorption isotherm of butadiene, and a good separation between butadiene and butene isomers. Often, MOFs do not perform as well in breakthrough adsorption experiments as expected from the single gas adsorption experiments [87,88,89]. However, in this case a very good selectivity was retained in the breakthrough experiments.…”

Section: Implications Of Rotational Dynamics On Applications Of Mofsmentioning

confidence: 99%

Rotational Dynamics of Linkers in Metal–Organic Frameworks

2019

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Among the numerous fascinating properties of metal–organic frameworks (MOFs), their rotational dynamics is perhaps one of the most intriguing, with clear consequences for adsorption and separation of molecules, as well as for optical and mechanical properties. A closer look at the rotational mobility in MOF linkers reveals that it is not only a considerably widespread phenomenon, but also a fairly diverse one. Still, the impact of these dynamics is often understated. In this review, we address the various mechanisms of linker rotation reported in the growing collection of literature, followed by a highlight of the methods currently used in their study, and we conclude with the impacts that such dynamics have on existing and future applications.

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Section: Implications Of Rotational Dynamics On Applications Of Mofsmentioning

confidence: 99%

Rotational Dynamics of Linkers in Metal–Organic Frameworks

2019

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“…Due to its large specific surface area, high chemical and thermal stability, adjustable structure and function, it has been widely applied in ion exchange, gas storage, gas adsorption and separation and other fields. [ 17,18 ] In recent years, ZIFs have also received attention in the field of flame retardancy. ZIFs in strong lewis acid (Zn 2+ , Co 2+ ions) site and neighboring imidazole ester functional coordination catalysis ensures the catalytic efficiency of ZIFs, [ 19–21 ] and at the same time, ZIFs generate metal oxides such as ZnO and Co 3 O 4 during combustion, and play a role of the flame retardant phase to catalyze the formation of more dense char layers in the condensed phase to effectively prevent further degradation of the matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of different zeolitic imidazolate frameworks nanoparticle‐modified β‐FeOOH rods on flame retardancy and smoke suppression of epoxy resin

Liu

Chen

et al. 2020

J of Applied Polymer Sci

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A simple method was used to load zeolitic imidazolate frameworks (ZIFs) onto β-FeOOH nanorods to ameliorate the flame retardancy and smoke suppression of epoxy resin (EP). The morphology and structure of ZIF-8-β-FeOOH (Z8Fe) and ZIF-67-β-FeOOH (Z67Fe) nano hybrids were systematically characterized by field emission scanning electron microscope, Fourier transform infrared and Xray diffraction (XRD) spectra, which proved the successful preparation of the hybrids. 3 wt% of Z8Fe and Z67Fe were added to the EP matrix, and their combustion properties were studied, respectively. The results showed that the composites' limiting oxygen index values were ameliorated to 27.3% and 28.1%, respectively. Their UL94 flame retardant rating was improved, their peak heat release rate and total heat release were reduced, their flame retardant performance was considerably improved, and their generation of toxic smoke was significantly suppressed. Further, through X-ray photoelectron spectroscopy, XRD and laser Raman spectroscopy analysis of the char residue, their potential mechanism of flame retardancy and smoke suppression were studied.

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“…RR Hydrogen, as tracer, is the first gas to break through the column, while both hydrocarbons are still being adsorbed. When the first hydrocarbon breaks through, a sharp hydrogen peak observed, as the consequence of gas accumulation in the downstream lines; it is just an artefact of the setup to determine flow rates of components leaving the column [45]. Before the second hydrocarbon also breaks through, a roll-up phenomenon is observed in the breakthrough of the first component, attributed to a displacement from the sodalite framework of the first by the second component.…”

Section: Pp (Mmol G -1 )mentioning

confidence: 99%

“…ZIF-67 is isostructural to ZIF-8, but based on cobalt, with a pore size of 3.3 Ǻ, slightly smaller than ZIF-8 pores. The stiffer Co-N bonds promote a more rigid structure, modifying the effective pore diameter; consequently, ZIF-67 shows inverse selectivity (alkane over alkene) [45][46][47][48]. University of Valencia (Spain) recently designed a new similar sodalite ZIF, now based on iron.…”

Section: Introductionmentioning

confidence: 99%

Cation influence in adsorptive propane/propylene separation in ZIF-8 (SOD) topology

Andrés-García

López-Cabrelles

Oar‐Arteta

et al. 2019

Chemical Engineering Journal

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Separation of propylene/propane is one of the most challenging and energy consuming processes in chemical industry. Propylene demand is increasing and a 99.5 % purity is required for industrial purposes. Adsorption based solutions are the most promising alternative to improve the economical/energetic efficiency of the process. ZIFs combine the desired characteristics from both MOFs and zeolites: tunability and flexibility from the metal organic frameworks, and exceptional thermal and chemical stability from zeolites. In order to enlighten the role of the cation in the sodalite ZIF-8 framework for propane/propylene separation, dynamic breakthrough measurements have been performed over ZIF-8(Zn), ZIF-67(ZIF-8(Co)) and MUV-3 (ZIF-8(Fe)), all materials based on the same linker methylimidazole. Cation substitution has a remarkable influence in the framework flexibility, and, consequently, in SOD-ZIF selectivity for light hydrocarbons. The differences between the crystallographic pore sizes of the material and the molecular dimensions of propane and propylene are so small, that the slightest change in the framework will cause notable advantages/disadvantages in the final application. While cobalt is known to promote a more rigid framework resulting in an adsorption selectivity towards propane, iron presents the inverse effect yielding selectivity to propylene. Zinc has an intermediate effect. A threshold pressure in the isotherm is observed for propylene uptake by ZIF-67 at 273 and 298 K, and only at the lower temperature for ZIF-8. Inlet mixture composition does not highly influence the adsorptive selectivity, although it clearly affects the pure hydrocarbon recovery. Over ZIF-67 breakthrough experiments at 298 K yield a temporary pure propylene flow representing 10-15% of the amount fed. Based on the adsorption selectivity for propane, ZIF-67 is a promising candidate for propylene/propane adsorptive separation.

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ZIF-67 as silver-bullet in adsorptive propane/propylene separation

Cited by 70 publications

References 34 publications

Rotational Dynamics of Linkers in Metal–Organic Frameworks

Rotational Dynamics of Linkers in Metal–Organic Frameworks

Effect of different zeolitic imidazolate frameworks nanoparticle‐modified β‐FeOOH rods on flame retardancy and smoke suppression of epoxy resin

Cation influence in adsorptive propane/propylene separation in ZIF-8 (SOD) topology

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