UARM Effective Route for Cu- and Zn- MOFs as Highly Efficient Adsorbents Towards Arsine (AsH3) Gas Adsorption: Design and a Systematic Study

Abstract Since it is essential to select the adsorbents, which are prepared with fast, environmentally friendly, and affordable methods, therefore, in this study, the Cu- and Zn- metal organic framework nanostructures were synthesized in the shortest route with the high efficiency by the effective method of ultrasonic assisted inverse micelle (UAIM) method. The synthesized samples were used as the new adsorbents in the arsine gas adsorption. The physicochemical properties of the products were examined in detail, so that the adsorbent dosage, temperature and pressure for the preparation of samples with distinctive characteristics were 0.05 mg, 25.00 °C, and 5.00 bar, respectively. Since the design and control of experimental parameters to find the best conditions for producing the samples with high adsorption efficiency is essential in this process, thus, for this purpose, fractional factorial design and response surface methodology were used. The results indicated the high efficiency of arsine gas adsorption for the synthesized samples in optimized conditions. The differences between arsine gas adsorption in this study in comparison with the previous studies could be due to the characteristic’s improvement using the effective synthetic methods as well as the systematic study of experimental parameters.

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Effects of Alkali Metal (Li, Na, and K) Incorporation in NH2–MIL125(Ti) on the Performance of CO2 Adsorption

Materials ◽

10.3390/ma12060844 ◽

2019 ◽

Vol 12 (6) ◽

pp. 844 ◽

Cited By ~ 4

Author(s):

Lifang Song ◽

Cheng Xue ◽

Huiyun Xia ◽

Shujun Qiu ◽

Lixian Sun ◽

...

Keyword(s):

Alkali Metal ◽

Surface Morphology ◽

High Efficiency ◽

Gas Adsorption ◽

Co2 Adsorption ◽

Metal Organic Framework ◽

Material Structure ◽

Phase Identification ◽

Ambient Conditions ◽

Metal Loading

A series of titanium-based, metal–organic framework (MOF) materials, xM@NH2-MIL125(Ti) (x is the alkali metal loading percentage during the synthesis; M = Li, Na, K), have been synthesized solvothermally. Alkali metal doping in the NH2–MIL125(Ti) in situ solvothermal process demonstrated a vital modification of the material structure and surface morphology for the CO2 adsorption capacity at ambient conditions. By changing the reactants’ precursor, including different kinds of alkali metal, the morphology of xM@NH2–MIL125(Ti) can be adjusted from a tetragonal plate through a circular plate to a truncated octahedron. The variation of the alkali metal loading results in substantial differences in the CO2 adsorption. The properties of xM@NH2–MIL125(Ti) were evaluated via functional group coordination using FT-IR, phase identification based on X-ray diffraction (XRD), surface morphology through scanning electron microscopy (SEM), as well as N2 and CO2 adsorption by physical gas adsorption analysis. This work reveals a new pathway to the modification of MOF materials for high-efficiency CO2 adsorption.

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Investigation on the La Replacement and Little Additive Modification of High-Performance Permanent Magnetic Strontium-Ferrite

Processes ◽

10.3390/pr9061034 ◽

2021 ◽

Vol 9 (6) ◽

pp. 1034

Author(s):

Ching-Chien Huang ◽

Chin-Chieh Mo ◽

Guan-Ming Chen ◽

Hsiao-Hsuan Hsu ◽

Guo-Jiun Shu

Keyword(s):

High Performance ◽

Single Phase ◽

Permanent Magnets ◽

High Efficiency ◽

Cobalt Content ◽

Preparation Condition ◽

Milling Process ◽

Experimental Parameters ◽

La Substitution ◽

Hard Magnets

In this work, an experiment was carried out to investigate the preparation condition of anisotropic, Fe-deficient, M-type Sr ferrite with optimum magnetic and physical properties by changing experimental parameters, such as the La substitution amount and little additive modification during fine milling process. The compositions of the calcined ferrites were chosen according to the stoichiometry LaxSr1-xFe12-2xO19, where M-type single-phase calcined powder was synthesized with a composition of x = 0.30. The effect of CaCO3, SiO2, and Co3O4 inter-additives on the Sr ferrite was also discussed in order to obtain low-temperature sintered magnets. The magnetic properties of Br = 4608 Gauss, bHc = 3650 Oe, iHc = 3765 Oe, and (BH)max = 5.23 MGOe were obtained for Sr ferrite hard magnets with low cobalt content at 1.7 wt%, which will eventually be used as high-end permanent magnets for the high-efficiency motor application in automobiles with Br > 4600 ± 50 G and iHc > 3600 ± 50 Oe.

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Shaggy-like Ru-clusters decorated core-shell metal-organic framework-derived CoOx@NPC as high-efficiency catalyst for NaBH4 hydrolysis

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2020.12.011 ◽

2021 ◽

Vol 46 (11) ◽

pp. 7772-7781 ◽

Cited By ~ 1

Author(s):

Shasha Dou ◽

Wanyu Zhang ◽

Yuting Yang ◽

Shuqing Zhou ◽

Xianfa Rao ◽

...

Keyword(s):

High Efficiency ◽

Metal Organic Framework ◽

Core Shell ◽

Metal Organic ◽

Organic Framework

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Rare-Earth Metal–Organic Framework@Graphene Oxide Composites As High-Efficiency Microwave Absorbents

Crystal Growth & Design ◽

10.1021/acs.cgd.0c01555 ◽

2021 ◽

Author(s):

Yu Zhou ◽

Liwei Zhu ◽

Yanjian Wang ◽

Liangmin Yu ◽

Xia Li

Keyword(s):

Graphene Oxide ◽

Rare Earth ◽

Rare Earth Metal ◽

High Efficiency ◽

Metal Organic Framework ◽

Earth Metal ◽

Metal Organic ◽

Oxide Composites ◽

Organic Framework

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Metal–Organic Framework-Based Solid Acid Materials for Biomass Upgrade

Transactions of Tianjin University ◽

10.1007/s12209-021-00298-4 ◽

2021 ◽

Author(s):

Yutian Qin ◽

Jun Guo ◽

Meiting Zhao

Keyword(s):

High Efficiency ◽

Solid Acid ◽

Metal Organic Framework ◽

Acid Sites ◽

Solid Acid Catalysts ◽

Future Research ◽

Acid Catalysts ◽

Metal Organic ◽

Biomass Transformation ◽

Organic Framework

AbstractBiomass is a green and producible source of energy and chemicals. Hence, developing high-efficiency catalysts for biomass utilization and transformation is urgently demanded. Metal–organic framework (MOF)-based solid acid materials have been considered as promising catalysts in biomass transformation. In this review, we first introduce the genre of Lewis acid and Brønsted acid sites commonly generated in MOFs or MOF-based composites. Then, the methods for the generation and adjustment of corresponding acid sites are overviewed. Next, the catalytic applications of MOF-based solid acid materials in various biomass transformation reactions are summarized and discussed. Furthermore, based on our personal insights, the challenges and outlook on the future development of MOF-based solid acid catalysts are provided. We hope that this review will provide an instructive roadmap for future research on MOFs and MOF-based composites for biomass transformation.

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High Purity/Recovery Separation of Propylene from Propyne Using Anion Pillared Metal-Organic Framework: Application of Vacuum Swing Adsorption (VSA)

Energies ◽

10.3390/en14030609 ◽

2021 ◽

Vol 14 (3) ◽

pp. 609

Author(s):

Majeda Khraisheh ◽

Fares AlMomani ◽

Gavin Walker

Keyword(s):

High Purity ◽

Gas Adsorption ◽

Metal Organic Framework ◽

Raw Material ◽

Strong Interactions ◽

Step Cycle ◽

Experimental Conditions ◽

High Purity Grade ◽

Trade Off ◽

Vacuum Swing Adsorption

Propylene is one of the world’s most important basic olefin raw material used in the production of a vast array of polymers and other chemicals. The need for high purity grade of propylene is essential and traditionally achieved by the very energy-intensive cryogenic separation. In this study, a pillared inorganic anion SIF62− was used as a highly selective C3H4 due to the square grid pyrazine-based structure. Single gas adsorption revealed a very high C3H4 uptake value (3.32, 3.12, 2.97 and 2.43 mmol·g−1 at 300, 320, 340 and 360 K, respectively). The values for propylene for the same temperatures were 2.73, 2.64, 2.31 and 1.84 mmol·g−1, respectively. Experimental results were obtained for the two gases fitted using Langmuir and Toth models. The former had a varied degree of representation of the system with a better presentation of the adsorption of the propylene compared to the propyne system. The Toth model regression offered a better fit of the experimental data over the entire range of pressures. The representation and fitting of the models are important to estimate the energy in the form of the isosteric heats of adsorption (Qst), which were found to be 45 and 30 kJ·Kmol−1 for propyne and propylene, respectively. A Higher Qst value reveals strong interactions between the solid and the gas. The dynamic breakthrough for binary mixtures of C3H4/C3H6 (30:70 v/v)) were established. Heavier propylene molecules were eluted first from the column compared to the lighter propyne. Vacuum swing adsorption was best suited for the application of strongly bound materials in adsorbents. A six-step cycle was used for the recovery of high purity C3H4 and C3H6. The VSA system was tested with respect to changing blowdown time and purge time as well as energy requirements. It was found that the increase in purge time had an appositive effect on C3H6 recovery but reduced productivity and recovery. Accordingly, under the experimental conditions used in this study for VSA, the purge time of 600 s was considered a suitable trade-off time for purging. Recovery up to 99%, purity of 98.5% were achieved at a purge time of 600 s. Maximum achieved purity and recovery were 97.4% and 98.5% at 100 s blowdown time. Energy and power consumption varied between 63–70 kWh/ton at the range of purge and blowdown time used. The VSA offers a trade-off and cost-effective technology for the recovery and separation of olefins and paraffin at low pressure and high purity.

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