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Новости Nature

Block copolymer derived uniform mesopores enable ultrafast electron and ion transport at high mass loadings

Porous hypercrosslinked polymer-TiO2-graphene composite photocatalysts for visible-light-driven CO2 conversion

Permanent porous hydrogen-bonded frameworks with two types of Brønsted acid sites for heterogeneous asymmetric catalysis

Development of High-Performance Supercapacitor based on a Novel Controllable Green Synthesis for 3D Nitrogen Doped Graphene

Porous supraparticle assembly through self-lubricating evaporating colloidal ouzo drops

Confinement of poly(allylamine) in Preyssler-type polyoxometalate and potassium ion framework for enhanced proton conductivity

3D printing of sacrificial templates into hierarchical porous materials

Three-dimensional printing of piezoelectric materials with designed anisotropy and directional response

Graphene nanoplatelets as nanofillers in mesoporous silicon oxycarbide polymer derived ceramics

Cooperative adsorption of carbon disulfide in diamine-appended metal–organic frameworks

Metal-organic framework glasses with permanent accessible porosity

A robust zirconium amino acid metal-organic framework for proton conduction

Лента новостей (Journal of Porous Materials)

Preparation of activated carbon derived from biomass and its application in lithium–sulfur batteries

Abstract

The most suitable activated carbon from three kinds of biomass wastes: walnut shell, peanut shell and pistachio hull is chosen to prepare the activated carbon–sulfur composites (AC-S) for rechargeable lithium–sulfur (Li–S) battery, due to the advantages of a relatively cheap, simple and non-toxic compositing progress. It indicates that the activated carbon (ACpe) derived from peanut shell owns flat, narrow and long shape macroporous structure with large micropores on its surface and is more suitable for the reaction in the Li–S battery. The ACpe/S composite containing about 57 wt% sulfur (sulfur loading of 0.83 mg cm− 2) shows a best initial discharge capacity of 943 mAhg− 1 at the rate of 0.2 C. It still retains a comparably high specific capacity of 619 mAh g− 1 with a coulombic efficiency of 95% after 100 cycles. This fact implies that the inherent flat pore construction of ACpe is beneficial for keep cycling stability for the lithium sulfur battery.

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Amine-impregnated carbon aerogels with ultra-high pore volume synthesized by pH adjusting for efficient CO 2 Capture

Abstract

Carbon aerogels with ultra-high pore volume and meso/macro pores were successfully synthesized by using silica hard templating combined sol–gel method by controlling the pH value of the initial reaction solution. High loadings (65–80 wt%) of TEPA (tetraethylenepentamine) and PEI (polyethyleneimine) were impregnated into CA with a high pore volume of 5.7 cm3/g for CO2 adsorption, respectively. The effects of amine loading, CO2 concentration, adsorption temperature, and moisture on the CO2 adsorption performance of the amine-loaded CA sorbents were comparatively investigated. The results showed that the CA with ultra-high pore volume enabled excellent CO2 adsorption capacity and fast kinetics (5.93 mmol/g and 4.70 mmol/g within 2.5 min for the case of TEPA and PEI respectively at 75 °C under 10% dry CO2). The sorbents exhibited good recycle-ability both in dry and humid conditions. Under humid conditions, the diffusion resistance of the sorbents at the initial stage of CO2 adsorption was observed. This study suggests that CA with large pore size could be utilized as promising amine sorbent for post-combustion CO2 capture.

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Ultralight and thermal insulation carbon foam/SiO 2 aerogel composites

Abstract

In this study, carbon foam (CF) and SiO2 aerogel composite were prepared by the sol–gel method under a circumstance of the atmospheric drying process. The Pyrolysis mechanism of carbon foam was investigated through thermal gravimetric analysis and Fourier transform infrared spectroscopy (FTIR). Carbon foam having ultralight properties with a density of 5.44 kg/m3, functions as a skeleton to support the composite. The maximum compressive stress measured for CF/SiO2 aerogel composite was about 1.0 MPa. At room temperature, the measured thermal conductivities of the CF and CF/SiO2 aerogel composite were 0.035 W/m K and 0.024 W/m K, while at 300 °C, it was reported to be 0.120 W/m K and 0.057 W/m K. Aerogel filled in carbon foam cells have significantly reduced the gaseous thermal conductivity of the prepared composite.

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Conversion of CO 2 to methanol using NiGa/mesosilica (NiGa/MSO) catalyst

Abstract

This study covered preparation, characterization and application of novel NiGa/MSO catalyst. The catalyst was prepared by impregnation method using precursors such as nitrates of nickel and gallium and support as mesoporous silica (mesosilica, MSO). Ordered mesoporous structure of the mesosilica support provided the catalyst with high dispersion of active sites and good thermal stability. Conversion of CO2 to methanol was also investigated to find suitable temperature and pressure for the process. Especially, oxidation state of active sites and catalyst element composition were also determined and calculated. Characterizations including XRD, TEM, TG-DSC-MS and XPS were used in the study. GC coupled with TCD and FID detectors were applied to determine the chemical composition of gas product.

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Superior architecture and electrochemical performance of MnO 2 doped PANI/CNT graphene fastened composite

Abstract

MnO2 doped polyaniline (PANI) grafted on 3D CNTs/graphene was fabricated using basic in situ redox deposition. The HRTEM and FESEM studies validate that MnO2 doped polyaniline (PANI) can be efficiently coated over the surface of CNTs/graphene. The incorporation of MnO2 in polyaniline well depicted by elemental mapping. The electrochemical studies showed that maximum specific capacitance of 1360 Fg−1 at 5 mV s−1 scan rate was achieved for the MnO2 doped PANI/CNTs/graphene composite, which was nearly 30% higher than 1160 Fg−1 of MnO2 doped PANI /CNTs and 50% more than the 600 Fg−1 of MnO2 doped PANI composite. Moreover, this composite provided a good cycling stability of 82% after 5000 cycles with mentionable capacitance retention. The incredible electrochemical performance is accredited mainly to the porous hierarchical architecture, which consisted of interconnected MnO2 doped PANI uniformly coated over the CNTs/graphene carbon framework.

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Synthesis of Mo-MCM-48 and their isomerization performances of n -heptane

Abstract

A series of Mo-MCM-48 molecular sieves were prepared by in-situ doping method and used as the catalyst for isomerization of n-heptane. The samples were characterized by X-ray powder diffraction, scanning electron microscope, transmission electron microscope, Nitrogen adsorption desorption isotherms (N2 adsorption–desorption), NH3 temperature programmed desorption (NH3-TPD), and Fourier Transform infrared spectroscopy (FT-IR). The results showed that Mo-MCM-48 samples modified by Mo species still had the typical cubic mesoporous structure of MCM-48. The results of n-heptane isomerization showed that when the doping amount of Mo species was 0.02, the reaction temperature was 250 °C, and the reaction time was 150 min, the conversion of n-heptane and the selectivity of isoheptane of Mo-MCM-48 were up to 36.71% and 52.41%, respectively. There were no obvious decline of the catalytic activity of Mo-MCM-48 after reaction for 190 min.

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Ce-doped mesoporous alumina supported Fe-based catalyst with high activity for oxidative dehydrogenation of 1-butene using CO 2 as soft oxidant

Abstract

Ce-doped mesoporous alumina supported Fe-based catalyst (Fe2O3/Meso-CeAl) was prepared and employed for 1,3-butadiene (BD) synthesis by oxidative dehydrogenation of 1-butene, using CO2 as soft oxidant. The worm-like porous structure of Fe2O3/Meso-CeAl catalyst with highly dispersed Ce in alumina matrix and high dispersion of iron species on Meso-CeAl surface was confirmed by N2 adsorption, transmission electron microscopy and X-ray diffraction results. Compared with Fe2O3/γ-Al2O3 and Fe2O3/Meso-Al2O3 catalysts, X-ray photoelectron spectroscopy and CO2-TPD results respectively demonstrated the increasing in oxygen storage capacity and improvement in CO2 adsorption and activation ability for Fe2O3/Meso-CeAl-100 catalyst. Consequently, the Fe2O3/Meso-CeAl-100 catalyst showed excellent catalytic activity (1879 gBD/kgcat/h), high CO2 conversion (14%) and high BD selectivity (51%). Not only the structural properties and highly dispersed iron species, but also the good oxygen storage capacity and thus good CO2 adsorption and activation ability contributed positively to the good performance of Fe2O3/Meso-CeAl-100 catalyst.

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Magnetically separable porous titanosilicate/Fe 3 O 4 hybrid nanocomposites with enhanced photocatalytic performance under UV light irradiation

Abstract

Magnetically separable mesoporous titanosilicate-Fe3O4 (FTS) hybrid nanocomposite has been developed. The synthesized porous FTS were well characterized by various analytical techniques like XRD, field emission SEM, TEM, BET, FT-IR, and UV–Vis diffused reflectance spectra for morphological and chemical properties evaluation. FESEM and TEM results shows the growth of finely distributed Fe3O4 particles in the titanosilicate matrix, its porous FTS has a great influence on the electronic and optical properties. More significantly, the FTS nanocomposite exhibit enhanced photocatalytic activity for the degradation of methylene blue under UV light irradiation. The optimum photocatalytic activity of FTS15 at 15 wt% of Fe3O4 under visible light is almost 3.5 and fivefold higher than pure titanosilicate (TS) and pure Fe3O4 (FO) respectively. We conformed that synthesized FTS15 hybrid photo catalyst are highly stable even after five successive experimental runs by XRD spectra. The improved photocatalytic performance of the FTS15 hybrid nanocomposite under UV light irradiation was due to the synergistic effect of the pure TS and pure FO. Therefore, FTS15 hybrid photo catalyst is a promising candidate for energy conversion and environmental remediation.

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