scholarly journals Dehydrogenation of Cyclohexanol to Cyclohexanone Over Nitrogen-doped Graphene supported Cu catalyst

2020 ◽  
Vol 15 (2) ◽  
pp. 568-578
Author(s):  
Alyaa. K. Mageed ◽  
Dayang A. B. Radiah ◽  
A. Salmiaton ◽  
Shamsul Izhar ◽  
Musab Abdul Razak ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Chemical Reduction ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Impregnation Method ◽  
Nitrogen Doped ◽  
Reduced Graphene ◽  
Cu Catalyst ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

In this study, the dehydrogenation of cyclohexanol to cyclohexanone over nitrogen-doped reduced graphene oxide (N-rGO) Cu catalyst has been reported. The N-rGO support was synthesized by chemical reduction of graphite oxide (GO). The synthesized N-rGO was used as a support to prepare the Cu/N-rGO catalyst via an incipient wet impregnation method. The as-prepared support and the Cu/N-rGO catalyst were characterized by FESEM, EDX, XRD, TEM, TGA, and Raman spectroscopy. The various characterization analysis revealed the suitability of the Cu/N-rGO as a heterogeneous catalyst that can be employed for the dehydrogenation of cyclohexanol to cyclohexanone. The catalytic activity of the Cu/N-rGO catalyst was tested in non-oxidative dehydrogenation of cyclohexanol to cyclohexanone using a stainless-steel fixed bed reactor. The effects of temperature, reactant flow rate, and time-on-stream on the activity of the Cu/N-rGO catalyst were examined. The Cu/N-rGO nanosheets show excellent catalytic activity and selectivity to cyclohexanone. The formation of stable Cu nanoparticles on N-rGO support interaction and segregation of Cu were crucial factors for the catalytic activity. The highest cyclohexanol conversion and selectivity of 93.3% and 82.7%, respectively, were obtained at a reaction temperature of 270 °C and cyclohexanol feed rate of 0.1 ml/min. Copyright © 2020 BCREC Group. All rights reserved 

scholarly journals Performance Analysis of TiO2-Modified Co/MgAl2O4 Catalyst for Dry Reforming of Methane in a Fixed Bed Reactor for Syngas (H2, CO) Production

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3347
Author(s):  
Arslan Mazhar ◽  
Asif Hussain Khoja ◽  
Abul Kalam Azad ◽  
Faisal Mushtaq ◽  
Salman Raza Naqvi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Fixed Bed ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Fixed Bed Reactor ◽  
Dry Reforming Of Methane ◽  
Catalyst Stability ◽  
Feed Ratio ◽  
Catalyst Loading ◽  
Impregnation Method

Co/TiO2–MgAl2O4 was investigated in a fixed bed reactor for the dry reforming of methane (DRM) process. Co/TiO2–MgAl2O4 was prepared by modified co-precipitation, followed by the hydrothermal method. The active metal Co was loaded via the wetness impregnation method. The prepared catalyst was characterized by XRD, SEM, TGA, and FTIR. The performance of Co/TiO2–MgAl2O4 for the DRM process was investigated in a reactor with a temperature of 750 °C, a feed ratio (CO2/CH4) of 1, a catalyst loading of 0.5 g, and a feed flow rate of 20 mL min−1. The effect of support interaction with metal and the composite were studied for catalytic activity, the composite showing significantly improved results. Moreover, among the tested Co loadings, 5 wt% Co over the TiO2–MgAl2O4 composite shows the best catalytic performance. The 5%Co/TiO2–MgAl2O4 improved the CH4 and CO2 conversion by up to 70% and 80%, respectively, while the selectivity of H2 and CO improved to 43% and 46.5%, respectively. The achieved H2/CO ratio of 0.9 was due to the excess amount of CO produced because of the higher conversion rate of CO2 and the surface carbon reaction with oxygen species. Furthermore, in a time on stream (TOS) test, the catalyst exhibited 75 h of stability with significant catalytic activity. Catalyst potential lies in catalyst stability and performance results, thus encouraging the further investigation and use of the catalyst for the long-run DRM process.

Research on the Catalytic Activity of MnyCezOx/TiO2 for Ethyl Acetate Oxidation

2013 ◽  
Vol 781-784 ◽  
pp. 308-311 ◽  
Author(s):  
Xin Li ◽  
Wei Su ◽  
Qi Bin Xia ◽  
Zhi Meng Liu
Keyword(s):  
Catalytic Activity ◽  
Ethyl Acetate ◽  
High Activity ◽  
Fixed Bed ◽  
Space Velocity ◽  
Fixed Bed Reactor ◽  
Impregnation Method ◽  
Acetate Oxidation ◽  
Acetate Concentration ◽  
Molar Ratios

Manganese and cerium based catalysts with different Mn/Ce molar ratios prepared by impregnation method for ethyl acetate oxidation. The activity tests of the samples were performed in a fixed-bed reactor. The effect of gas hourly space velocity (GHSV) and ethyl acetate concentration on the catalytic activity of the catalyst were also investigated. The results showed that these catalysts had high activity for the catalytic oxidation of ethyl acetate, of which the catalyst Mn0.9Ce0.1Ox/TiO2exhibitedthe bestactivity, and the temperature required for 90% conversion of ethyl acetate was at 216 °C. The catalyst Mn0.9Ce0.1Ox/TiO2still maintained high activity in the range of GHSV (16,500 to 48,500 h-1) and ethyl acetate concentration (4526 to 7092 mg/m3). In additional, experiments for measuring stability of Mn0.9Ce0.1Ox/TiO2were carried out, and experimental results showed that the good stability of Mn0.9Ce0.1Ox/TiO2was kept after it has run for 25 hours.

Superior catalytic activity of nitrogen-doped graphene cathodes for high energy capacity sodium–air batteries

2013 ◽  
Vol 49 (100) ◽  
pp. 11731 ◽  
Author(s):  
Yongliang Li ◽  
Hossein Yadegari ◽  
Xifei Li ◽  
Mohammad N. Banis ◽  
Ruying Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Energy ◽  
Energy Capacity ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

scholarly journals Caffeine as Nitrogen Source for Reduce Graphene Doping, and Its Functionalization with Silver Nanowires

2018 ◽  
Author(s):  
Daniel Ramirez-Gonzalez ◽  
Jose de Jesus Cruz-Rivera ◽  
Hugo Tiznado ◽  
Angel Gabriel Rodriguez-Vazquez ◽  
Ivan Guillen-Escamilla ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Nitrogen Source ◽  
Silver Nanowires ◽  
Chemical Reduction ◽  
Low Cost ◽  
Nitrogen Doped ◽  
Nanowires Growth ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Ft Ir

In this work, we propose an easy and a low cost method for the synthesis of Nitrogen-Doped Graphene NDG and its silver nanowires NW functionalization NWGN. The synthesis was performed using the improved graphene oxide method, chemical reduction of graphene oxide in the presence of caffeine as green nitrogen source and the subsequently the silver nanowires growth in the surface, by the chemical reductions salts in the presence of NG. Achieving a homogeneous growing (coating) of graphene sheets. The samples were analyzed using conventional characterization techniques: SEM-EDX, XRD, FT-IR, RAMAN, TEM, HRTEM, STEM and XPS.

scholarly journals Solid-state synthesis of few-layer cobalt-doped MoS2 with CoMoS phase on nitrogen-doped graphene driven by microwave irradiation for hydrogen electrocatalysis

RSC Advances ◽  
2020 ◽  
Vol 10 (56) ◽  
pp. 34323-34332
Author(s):  
Junpeng Fan ◽  
Joakim Ekspong ◽  
Anumol Ashok ◽  
Sergey Koroidov ◽  
Eduardo Gracia-Espino
Keyword(s):  
Catalytic Activity ◽  
Solid State ◽  
Microwave Irradiation ◽  
Hydrogen Evolution ◽  
Solid State Synthesis ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Production of nanostructured cobalt-doped MoS2 flakes with the CoMoS phase by microwave irradiation with improved catalytic activity towards hydrogen evolution.

A Facile approach to NiCoO2 intimately standing on nitrogen doped graphene sheets by one-step hydrothermal synthesis for supercapacitors

2015 ◽  
Vol 3 (13) ◽  
pp. 7121-7131 ◽  
Author(s):  
Yazhou Xu ◽  
Junchao Wei ◽  
Licheng Tan ◽  
Ji Yu ◽  
Yiwang Chen
Keyword(s):  
Hydrothermal Synthesis ◽  
Graphene Sheets ◽  
Nitrogen Doped ◽  
Nickel Cobaltite ◽  
Reduced Graphene ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
One Step

Binary nickel cobaltite oxides intimately standing on nitrogen-doped reduced graphene sheets are prepared utilizing a one-step hydrothermal synthesis.

scholarly journals Tin-based materials supported on nitrogen-doped reduced graphene oxide towards their application in lithium-ion batteries

RSC Advances ◽  
2017 ◽  
Vol 7 (84) ◽  
pp. 53126-53134 ◽  
Author(s):  
Xiaoxia Zuo ◽  
Bao Li ◽  
Kun Chang ◽  
Hongwei Tang ◽  
Zhaorong Chang
Keyword(s):  
Graphene Oxide ◽  
Lithium Ion Batteries ◽  
Electronic Properties ◽  
Reduced Graphene Oxide ◽  
Lithium Ion ◽  
Nitrogen Doped ◽  
Reduced Graphene ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Significant Attention

Recently, nitrogen-doped graphene has attracted significant attention for application as an anode in lithium-ion batteries due to effective modulation of the electronic properties of graphene.

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