Synthesis of efficient Co and N co-doped carbon catalysts with high surface areas for selective oxidation of ethylbenzene

2018 ◽  
Vol 42 (15) ◽  
pp. 12677-12683
Author(s):  
Yuan Li ◽  
Shanshan Jie ◽  
Kun Li ◽  
Zhigang Liu
Keyword(s):  
Selective Oxidation ◽  
High Surface ◽  
Cobalt Nitrate ◽  
Acid Etching ◽  
Pore Former ◽  
Surface Areas ◽  
Oxidation Of Ethylbenzene ◽  
Phenanthroline Monohydrate ◽  
Carbon Catalysts ◽  
Co Doped

In this manuscript, Co and N co-doped carbon catalysts with high surface areas were prepared via the pyrolysis of cobalt nitrate and 1,10-phenanthroline monohydrate, using Mg(OH)2 as a pore former, followed by acid etching.

scholarly journals Nitrogen and sulfur co-doped cobalt carbon catalysts for ethylbenzene oxidation with synergistically enhanced performance

RSC Advances ◽  
2019 ◽  
Vol 9 (17) ◽  
pp. 9462-9467 ◽  
Author(s):  
Sheng Chen ◽  
Yujie Wu ◽  
Shanshan Jie ◽  
Chak Tong Au ◽  
Zhigang Liu
Keyword(s):  
Selective Oxidation ◽  
Ethylbenzene Oxidation ◽  
Oxidation Of Ethylbenzene ◽  
Carbon Catalysts ◽  
Co Doped

Co-N-S-C catalysts with rod-like structures were synthesized for the selective oxidation of ethylbenzene using O2 as an oxidant.

Bicontinuous mesoporous Co, N co-doped carbon catalysts with high catalytic performance for ethylbenzene oxidation

2019 ◽  
Vol 43 (19) ◽  
pp. 7275-7281 ◽  
Author(s):  
Lushuang Zhang ◽  
Shanshan Jie ◽  
Zhigang Liu
Keyword(s):  
Selective Oxidation ◽  
Mesoporous Carbon ◽  
Catalytic Performance ◽  
Ethylbenzene Oxidation ◽  
Oxidation Of Ethylbenzene ◽  
Carbon Catalysts ◽  
Co Doped

Bicontinuous Co, N co-doped mesoporous carbon catalysts achieved superior catalytic performance for selective oxidation of ethylbenzene.

scholarly journals Activated Carbons from Fast Pyrolysis Biochar as Novel Catalysts for the Post-Treatment of Pyrolysis Vapors, Studied by Analytical Pyrolysis

2020 ◽  
Vol 6 (4) ◽  
pp. 65
Author(s):  
Taina Ohra-aho ◽  
Christian Lindfors ◽  
Juha Lehtonen ◽  
Tarja Tamminen ◽  
Virpi Siipola
Keyword(s):  
Activated Carbon ◽  
Active Sites ◽  
Activated Carbons ◽  
Degradation Products ◽  
High Surface ◽  
Fast Pyrolysis ◽  
Post Treatment ◽  
Mineral Contents ◽  
Surface Areas ◽  
Carbon Catalysts

Biochars are attractive materials for carbon catalysts since their carbon content and surface area are relatively high and minerals present in biochar can act as active sites for catalytic reactions. In this study, biochars from the fast pyrolysis of birch, pine, and unbarked willow were activated and acid washed. These materials were tested as catalysts for a post-treatment of pine wood pyrolysis vapors, aiming at stabilizing the vapors before their condensation. All the unmodified biochars had high content of minerals, those being highest in willow due to the bark. After the activation treatments, the surface areas and pore volumes of all biochars significantly increased. All studied biochars and activated carbon catalysts reduced the oxygen content of the pyrolysis degradation products. This effect was more pronounced for compounds derived from polysaccharides vs. lignin. The most promising catalyst for vapor upgrading was unwashed activated carbon from willow, having high surface areas and pore volumes together with high mineral contents. These properties together promoted the high conversion of polysaccharide-derived products (anhydrosugars, acids, and pyrans) into CO2. Release of highly oxidized degradation products may indicate that reductive stabilization takes place via hydrogen migration from the polysaccharide-derivatives to lignin derivatives, mediated by the carbon catalyst.

Boron and nitrogen co-doped ordered microporous carbons with high surface areas

2017 ◽  
Vol 53 (100) ◽  
pp. 13348-13351 ◽  
Author(s):  
Alberto Castro-Muñiz ◽  
Hirotomo Nishihara ◽  
Tetsuya Hirota ◽  
Mao Ohwada ◽  
Li-Xiang Li ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
High Surface ◽  
Nay Zeolite ◽  
Hard Template ◽  
Microporous Carbons ◽  
Surface Areas ◽  
Co Doped

Boron and nitrogen co-doped ordered microporous carbons with high surface areas are obtained by using NaY zeolite as a hard template and an ionic liquid, 1-ethyl-3-methylimidazolium tetracyanoborate (EMIT), as a BN source.

Nitrogen and sulfur co-doped carbon nanospheres for highly efficient oxidation of ethylbenzene

2018 ◽  
Vol 42 (19) ◽  
pp. 15962-15967 ◽  
Author(s):  
Minghui Liu ◽  
Yingcen Liu ◽  
Zhanming Gao ◽  
Cui Wang ◽  
Wanyue Ye ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Carbon Spheres ◽  
Carbon Nanospheres ◽  
Facile Synthesis ◽  
Highly Efficient ◽  
Enhanced Activity ◽  
Oxidation Of Ethylbenzene ◽  
Co Doped

A facile synthesis of well-distributed N and S co-doped carbon spheres and their enhanced activity towards the selective oxidation of ethylbenzene.

A Highly Crystalline Anthracene-Based MOF-74 Series Featuring Electrical Conductivity and Luminescence

2019 ◽  
Author(s):  
Patricia Scheurle ◽  
Andre Mähringer ◽  
Andreas Jakowetz ◽  
Pouya Hosseini ◽  
Alexander Richter ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Metal Ions ◽  
Light Emission ◽  
Block Design ◽  
High Surface ◽  
Visible Spectrum ◽  
Building Blocks ◽  
Divalent Metal Ions ◽  
Conductivity Enhancement ◽  
Surface Areas

Recently, a small group of metal-organic frameworks (MOFs) has been discovered featuring substantial charge transport properties and electrical conductivity, hence promising to broaden the scope of potential MOF applications in fields such as batteries, fuel cells and supercapacitors. In combination with light emission, electroactive MOFs are intriguing candidates for chemical sensing and optoelectronic applications. Here, we incorporated anthracene-based building blocks into the MOF-74 topology with five different divalent metal ions, that is, Zn2+, Mg2+, Ni2+, Co2+ and Mn2+, resulting in a series of highly crystalline MOFs, coined ANMOF-74(M). This series of MOFs features substantial photoluminescence, with ANMOF-74(Zn) emitting across the whole visible spectrum. The materials moreover combine this photoluminescence with high surface areas and electrical conductivity. Compared to the original MOF-74 materials constructed from 2,5-dihydroxy terephthalic acid and the same metal ions Zn2+, Mg2+, Ni2+, Co2+ and Mn2+, we observed a conductivity enhancement of up to six orders of magnitude. Our results point towards the importance of building block design and the careful choice of the embedded MOF topology for obtaining materials with desired properties such as photoluminescence and electrical conductivity.

scholarly journals Mitigating the Agglomeration of Nanofiller in a Mixed Matrix Membrane by Incorporating an Interface Agent

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 328
Author(s):  
Manh-Tuan Vu ◽  
Gloria M. Monsalve-Bravo ◽  
Rijia Lin ◽  
Mengran Li ◽  
Suresh K. Bhatia ◽  
...  
Keyword(s):  
Gas Separation ◽  
Polymer Matrix ◽  
Ion Beam ◽  
High Surface ◽  
Mixed Matrix Membrane ◽  
Mechanical And Thermal Properties ◽  
Separation Membranes ◽  
Surface Areas ◽  
Separation Membrane ◽  
Focus Ion Beam

Nanodiamonds (ND) have recently emerged as excellent candidates for various applications including membrane technology due to their nanoscale size, non-toxic nature, excellent mechanical and thermal properties, high surface areas and tuneable surface structures with functional groups. However, their non-porous structure and strong tendency to aggregate are hindering their potential in gas separation membrane applications. To overcome those issues, this study proposes an efficient approach by decorating the ND surface with polyethyleneimine (PEI) before embedding it into the polymer matrix to fabricate MMMs for CO2/N2 separation. Acting as both interfacial binder and gas carrier agent, the PEI layer enhances the polymer/filler interfacial interaction, minimising the agglomeration of ND in the polymer matrix, which is evidenced by the focus ion beam scanning electron microscopy (FIB-SEM). The incorporation of PEI into the membrane matrix effectively improves the CO2/N2 selectivity compared to the pristine polymer membranes. The improvement in CO2/N2 selectivity is also modelled by calculating the interfacial permeabilities with the Felske model using the gas permeabilities in the MMM. This study proposes a simple and effective modification method to address both the interface and gas selectivity in the application of nanoscale and non-porous fillers in gas separation membranes.

scholarly journals A simple one-step electrochemical deposition of bioinspired nanocomposite for the non-enzymatic detection of dopamine

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Vijayaraj Kathiresan ◽  
Dinakaran Thirumalai ◽  
Thenmozhi Rajarathinam ◽  
Miri Yeom ◽  
Jaewon Lee ◽  
...  
Keyword(s):  
Electrochemical Deposition ◽  
Electrochemical Impedance ◽  
High Surface ◽  
Electrochemical Characteristics ◽  
Surface Areas ◽  
Electrochemically Reduced Graphene Oxide ◽  
Sensitivity And Selectivity ◽  
Controlled Deposition ◽  
Enzymatic Detection ◽  
Walled Carbon Nanotubes

AbstractA simple and cost-effective electrochemical synthesis of carbon-based nanomaterials for electrochemical biosensor is of great challenge these days. Our study describes a single-step electrochemical deposition strategy to prepare a nanocomposite of electrochemically reduced graphene oxide (ErGO), multi-walled carbon nanotubes (MWCNTs), and polypyrrole (PPy) in an aqueous solution of pH 7.0 for dopamine (DA) detection. The ErGO/MWCNTs/PPy nanocomposites show enhanced electrochemical performance due to the strong π–π* stacking interactions among ErGO, MWCNTs, and PPy. The efficient interaction of the nanocomposites is confirmed by evaluating its physical and electrochemical characteristics using field-emission scanning electron microscopy, Raman spectroscopy, electrochemical impedance spectroscopy, cyclic voltammetry, and amperometry. The deposited nanocomposites are highly stable on the substrates and possess high surface areas, which is vital to improve the sensitivity and selectivity for DA detection. The controlled deposition of the ErGO/MWCNTs/PPy nanocomposites can provide enhanced electrochemical detection of DA. The sensor demonstrates a short time response within 2 s and is a highly sensitive approach for DA detection with a dynamic linear range of 25–1000 nM (R2 = 0.999). The detection limit is estimated to be 2.3 nM, and the sensor sensitivity is calculated to be 8.96 μA μM−1 cm−2, with no distinct responses observed for other biological molecules.

A facile method to fabricate monolithic alumina–silica aerogels with high surface areas and good mechanical properties

2020 ◽  
Vol 40 (6) ◽  
pp. 2480-2488 ◽  
Author(s):  
Fei Peng ◽  
Yonggang Jiang ◽  
Junzong Feng ◽  
Liangjun Li ◽  
Huafei Cai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Surface ◽  
Silica Aerogels ◽  
Surface Areas ◽  
Monolithic Alumina
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