Synergistic sorbent separation for one-step ethylene purification from a four-component mixture

Science ◽  
2019 ◽  
Vol 366 (6462) ◽  
pp. 241-246 ◽  
Author(s):  
Kai-Jie Chen ◽  
David G. Madden ◽  
Soumya Mukherjee ◽  
Tony Pham ◽  
Katherine A. Forrest ◽  
...  
Keyword(s):  
Energy Input ◽  
Membrane Separation ◽  
Packed Bed ◽  
Trace Impurities ◽  
Component Mixture ◽  
Metal Organic ◽  
One Step ◽  
Volume Product ◽  
The One ◽  
Cryogenic Distillation

Purification of ethylene (C2H4), the largest-volume product of the chemical industry, currently involves energy-intensive processes such as chemisorption (CO2 removal), catalytic hydrogenation (C2H2 conversion), and cryogenic distillation (C2H6 separation). Although advanced physisorbent or membrane separation could lower the energy input, one-step removal of multiple impurities, especially trace impurities, has not been feasible. We introduce a synergistic sorbent separation method for the one-step production of polymer-grade C2H4 from ternary (C2H2/C2H6/C2H4) or quaternary (CO2/C2H2/C2H6/C2H4) gas mixtures with a series of physisorbents in a packed-bed geometry. We synthesized ultraselective microporous metal-organic materials that were readily regenerated, including one that was selective for C2H6 over CO2, C2H2, and C2H4.

scholarly journals A packed bed Reactor Combined with Membrane Unit for the Elimination of Toluene Vapours using a Novel Packing Material

2020 ◽  
Vol 9 (1) ◽  
pp. 1679-1683
Keyword(s):  
Membrane Fouling ◽  
Membrane Separation ◽  
Packed Bed ◽  
Polymer Processing ◽  
Packing Material ◽  
Packed Bed Reactor ◽  
Membrane Unit ◽  
Membrane Array ◽  
The One ◽  
Oily Liquid

Toluene is a colorless and aromatic oily liquid primarily used in the petrochemical and polymer processing industries and has been used in this study as the target compound. Continuous experiments were performed in a biofilter on a laboratory scale, followed by a membrane reactor to monitor toluene as one single contaminant. This bioreactor device included a reactor with a packed bed and a membrane array. Pearl millet stacks and berl saddles have been used as packing material for the development of the attached microorganism. Toluene was efficiently treated, with toluene effluent concentrations held at less than 0.4 g m-3 and a Total Removal Efficiency (TRE) of more than 96 % achieved when fluctuating loads were faced by the packed bed reactor. The combined packed bed reactor system had a maximum RE of 93.8 g m -3 h -1 , which was higher than the one obtained with the packed bed reactor alone. In this work the influences on gas membrane separation were also explored in the combined bioreactor and membrane fouling.

Metal organic framework derived CoFe@N-doped carbon/reduced graphene sheets for enhanced oxygen evolution reaction

2018 ◽  
Vol 5 (8) ◽  
pp. 1962-1966 ◽  
Author(s):  
Fanhao Kong ◽  
Kunfeng Chen ◽  
Shuyan Song ◽  
Dongfeng Xue
Keyword(s):  
Prussian Blue ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Metal Organic Framework ◽  
Graphene Sheets ◽  
Prussian Blue Analogues ◽  
Reduced Graphene ◽  
Metal Organic ◽  
One Step ◽  
The One

Architectures of CoFe@N-doped carbon/wrinkled rGO sheets are synthesizedviathe one-step annealing of Prussian blue analogues and GO sheet composites. The optimized structure exhibits a low overpotential of 278 mV to drive 10 mA cm−2and has a durable stability.

Synthesis, characterization, and photocatalytic degradation properties of ZnO/ZnFe2O4 magnetic heterostructures

2017 ◽  
Vol 41 (24) ◽  
pp. 15433-15438 ◽  
Author(s):  
Yan Xu ◽  
Shumin Wu ◽  
Xianliang Li ◽  
Yehang Huang ◽  
Zhuopeng Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Metal Organic Framework ◽  
High Photocatalytic Activity ◽  
Mixed Metal ◽  
Magnetic Heterostructures ◽  
Metal Organic ◽  
One Step ◽  
The One ◽  
Degradation Properties

A nanosheet-constructed ZnO/ZnFe2O4 composite with high photocatalytic activity is obtained via the one-step pyrolysis of a Zn–Fe mixed-metal–organic framework precursor.

scholarly journals Sustainable One-Pot Immobilization of Enzymes in/on Metal-Organic Framework Materials

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1002 ◽  
Author(s):  
M. Asunción Molina ◽  
Victoria Gascón-Pérez ◽  
Manuel Sánchez-Sánchez ◽  
Rosa M. Blanco
Keyword(s):  
Room Temperature ◽  
Metal Organic Framework ◽  
One Pot ◽  
Framework Materials ◽  
Immobilization Of Enzymes ◽  
Metal Organic ◽  
One Step ◽  
The One ◽  
Synthetic Approaches ◽  
Organic Framework

The industrial use of enzymes generally necessitates their immobilization onto solid supports. The well-known high affinity of enzymes for metal-organic framework (MOF) materials, together with the great versatility of MOFs in terms of structure, composition, functionalization and synthetic approaches, has led the scientific community to develop very different strategies for the immobilization of enzymes in/on MOFs. This review focuses on one of these strategies, namely, the one-pot enzyme immobilization within sustainable MOFs, which is particularly enticing as the resultant biocomposite Enzyme@MOFs have the potential to be: (i) prepared in situ, that is, in just one step; (ii) may be synthesized under sustainable conditions: with water as the sole solvent at room temperature with moderate pHs, etc.; (iii) are able to retain high enzyme loading; (iv) have negligible protein leaching; and (v) give enzymatic activities approaching that given by the corresponding free enzymes. Moreover, this methodology seems to be near-universal, as success has been achieved with different MOFs, with different enzymes and for different applications. So far, the metal ions forming the MOF materials have been chosen according to their low price, low toxicity and, of course, their possibility for generating MOFs at room temperature in water, in order to close the cycle of economic, environmental and energy sustainability in the synthesis, application and disposal life cycle.

scholarly journals {Cu2SiW12O40}@HKUST-1 synthesized by the one-step solution method with efficient bifunctional activity for supercapacitor and oxygen evolution reaction

2021 ◽  
Author(s):  
Huan Liu ◽  
Li Ge Gong ◽  
Chun Xiao Wang ◽  
Chun Mei Wang ◽  
Kai Yu ◽  
...  
Keyword(s):  
Composite Materials ◽  
Oxygen Evolution Reaction ◽  
Solution Method ◽  
Metal Organic Framework ◽  
Oxygen Production ◽  
Water Oxygen ◽  
Metal Organic ◽  
One Step ◽  
Supercapacitor Performance ◽  
The One

The construction of polyoxometalates (POMs) and metal-organic framework (MOF) composite materials (POMOFs) is very desirable for efficient supercapacitor performance and electrocatalytic water oxygen production, but it is still challenging. Herein,...

A Series of Metal-Organic Frameworks for Selective CO2 Capture and Catalytic Oxidative Carboxylation of Olefins

2018 ◽  
Author(s):  
Huong T. D. Nguyen ◽  
Y B. N. Tran ◽  
Hung N. Nguyen ◽  
Tranh C. Nguyen ◽  
Felipe Gándara ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Adsorption ◽  
New Materials ◽  
One Pot ◽  
Acid Gas ◽  
Naphthalene Diimide ◽  
Styrene Carbonate ◽  
Metal Organic ◽  
Adsorption Of Co ◽  
The One

<p>Three novel lanthanide metal˗organic frameworks (Ln-MOFs), namely MOF-590, -591, and -592 were constructed from a naphthalene diimide tetracarboxylic acid. Gas adsorption measurements of MOF-591 and -592 revealed good adsorption of CO<sub>2</sub> (low pressure, at room temperature) and moderate CO<sub>2</sub> selectivity over N<sub>2</sub> and CH<sub>4</sub>. Accordingly, breakthrough measurements were performed on a representative MOF-592, in which the separation of CO<sub>2</sub> from binary mixture containing N<sub>2</sub> and CO<sub>2</sub> was demonstrated without any loss in performance over three consecutive cycles. Moreover, MOF-590, MOF-591, and MOF-592 exhibited catalytic activity in the one-pot synthesis of styrene carbonate from styrene and CO<sub>2</sub> under mild conditions (1 atm CO<sub>2</sub>, 80 °C, and solvent-free). Among the new materials, MOF-590 revealed a remarkable efficiency with exceptional conversion (96%), selectivity (95%), and yield (91%). </p><br>

A Study on the Rearrangement of Dialkyl 1-Aryl-1-hydroxymethylphosphonates to Benzyl Phosphates

2020 ◽  
Vol 24 (4) ◽  
pp. 465-471 ◽  
Author(s):  
Zita Rádai ◽  
Réka Szabó ◽  
Áron Szigetvári ◽  
Nóra Zsuzsa Kiss ◽  
Zoltán Mucsi ◽  
...  
Keyword(s):  
Quantum Chemical ◽  
Room Temperature ◽  
Phase Transfer ◽  
One Pot ◽  
Substrate Dependence ◽  
Triethylbenzylammonium Chloride ◽  
One Step ◽  
The Pudovik Reaction ◽  
The One ◽  
Solid Liquid

The phospha-Brook rearrangement of dialkyl 1-aryl-1-hydroxymethylphosphonates (HPs) to the corresponding benzyl phosphates (BPs) has been elaborated under solid-liquid phase transfer catalytic conditions. The best procedure involved the use of triethylbenzylammonium chloride as the catalyst and Cs2CO3 as the base in acetonitrile as the solvent at room temperature. The substrate dependence of the rearrangement has been studied, and the mechanism of the transformation under discussion was explored by quantum chemical calculations. The key intermediate is an oxaphosphirane. The one-pot version starting with the Pudovik reaction has also been developed. The conditions of this tandem transformation were the same, as those for the one-step HP→BP conversion.

scholarly journals One-Year Clinical Evaluation of the Bonding Effectiveness of a One-Step, Self-Etch Adhesive in Noncarious Cervical Lesion Therapy

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Babacar Faye ◽  
Mouhamed Sarr ◽  
Khaly Bane ◽  
Adjaratou Wakha Aidara ◽  
Seydina Ousmane Niang ◽  
...  
Keyword(s):  
Clinical Performance ◽  
Retention Rate ◽  
Recall Rate ◽  
Acid Etching ◽  
Significant Difference ◽  
Usphs Criteria ◽  
One Step ◽  
One Year ◽  
The One ◽  
Self Etch

This study evaluated the one-year clinical performance of a one-step, self-etch adhesive (Optibond All-in-One, Kerr, CA, USA) combined with a composite (Herculite XRV Ultra, Kerr Hawe, CA, USA) to restore NCCLs with or without prior acid etching. Restorations performed by the same practitioner were evaluated at baseline and after 3, 6, and 12 months using modified USPHS criteria. At 6 months, the recall rate was 100%. The retention rate was 84.2% for restorations with prior acid etching, but statistically significant differences were observed between baseline and 6 months. Without acid etching, the retention rate was 77%, and no statistically significant difference was noted between 3 and 6 months. Marginal integrity (93.7% with and 87.7% without acid etching) and discoloration (95.3% with and 92.9% without acid etching) were scored as Alpha or Bravo, with better results after acid etching. After one year, the recall rate was 58.06%. Loss of pulp vitality, postoperative sensitivity, or secondary caries were not observed. After one year retention rate was of 90.6% and 76.9% with and without acid conditioning. Optibond All-in-One performs at a satisfactory clinical performance level for restoration of NCCLs after 12 months especially after acid etching.

Sign in / Sign up

Export Citation Format

Share Document