Cobalt catalysts: very efficient for hydrogenation of biomass-derived ethyl levulinate to gamma-valerolactone under mild conditions

2014 ◽  
Vol 16 (8) ◽  
pp. 3870-3875 ◽  
Author(s):  
Huacong Zhou ◽  
Jinliang Song ◽  
Honglei Fan ◽  
Binbin Zhang ◽  
Yingying Yang ◽  
...  
Keyword(s):  
Cobalt Catalyst ◽  
Cobalt Catalysts ◽  
Mild Conditions ◽  
Ethyl Levulinate

A cobalt catalyst is very efficient and stable for hydrogenation of biomass-derived ethyl levulinate to gamma-valerolactone under mild conditions.

Hydrodeoxygenation of sulfoxides into sulfides under mild conditions over a heterogeneous cobalt catalyst

2021 ◽  
Author(s):  
Yanxin Wang ◽  
Kaiyue Yao ◽  
Duan-Jian Tao ◽  
Nian Xiang ◽  
Wei Wang ◽  
...  
Keyword(s):  
Cobalt Catalyst ◽  
Cobalt Catalysts ◽  
Nitrogen Doped ◽  
Mild Conditions ◽  
One Step ◽  
Supported Cobalt Catalysts ◽  
The One ◽  
Nitrogen Doped Carbon

In this study, the Al2O3/nitrogen-doped carbon supported cobalt catalysts (Co-NC/Al2O3-T, where T represents the pyrolysis temperatures) were successfully prepared by the one-step pyrolysis step and studied for the hydrodeoxygenation of...

scholarly journals Supported cobalt catalysts for the selective hydrogenation of ethyl levulinate to various chemicals

RSC Advances ◽  
2018 ◽  
Vol 8 (17) ◽  
pp. 9152-9160 ◽  
Author(s):  
Youliang Cen ◽  
Shanhui Zhu ◽  
Jing Guo ◽  
Jiachun Chai ◽  
Weiyong Jiao ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Cobalt Catalyst ◽  
Cobalt Catalysts ◽  
Ethyl Levulinate ◽  
Supported Cobalt Catalysts ◽  
Excellent Selectivity

Biomass-derived ethyl levulinate can flexibly convert to GVL, EHP, 1,4-PDO and 2-MTHF with excellent selectivity on a supported cobalt catalyst.

scholarly journals MODIFIED COBALT CATALYSTS FOR HYDROGENATION OF HYDROCARBONS

2020 ◽  
Vol 18 (3) ◽  
pp. 156-161
Author(s):  
A.N. Aitugan ◽  
S.K. Tanirbergenova ◽  
Ye. Tileuberdi ◽  
D. Tugelbayeva
Keyword(s):  
Catalytic Activity ◽  
Aluminum Oxide ◽  
Process Parameters ◽  
Cobalt Catalyst ◽  
Cobalt Catalysts ◽  
Oxide Content ◽  
Acetylene Hydrogenation ◽  
Aluminum Oxides ◽  
Selective Hydrogenation Of Acetylene ◽  
Chemical Contents

This work is devoted to the study of the influence of aluminum oxide content on the activity of cobalt catalysts in the reaction of selective hydrogenation of acetylene to ethylene. Cobalt catalysts modified with aluminum oxide having size between 50 to 500 nm were synthesized. Chemical contents and structure of carrier were investigated.  The catalytic activity of 5 % Со /clay and 5% Co/SiAl catalysts at acetylene hydrogenation was studied in the temperature range 100-180 , with a ratio of 1:2 of acetylene and hydrogen. The ethylene yield is 87.8 % in modifying the cobalt catalyst with aluminum oxide, whereas with the same process parameters, the ethylene yield is 72 %. 5 % Cobalt catalysts modified with 1.5 % aluminum oxides are more active in hydrogenation acetylene process than 5 % Со /clay 450 ℃ catalyst.

scholarly journals Ni/Co-Catalyzed Homo-Coupling of Alkyl Tosylates

Molecules ◽  
2019 ◽  
Vol 24 (8) ◽  
pp. 1458 ◽  
Author(s):  
Kimihiro Komeyama ◽  
Ryusuke Tsunemitsu ◽  
Takuya Michiyuki ◽  
Hiroto Yoshida ◽  
Itaru Osaka
Keyword(s):  
Electron Transfer ◽  
Oxidative Addition ◽  
Alkyl Halides ◽  
Cobalt Catalysts ◽  
Single Electron ◽  
Single Electron Transfer ◽  
Mild Conditions

A direct reductive homo-coupling of alkyl tosylates has been developed by employing a combination of nickel and nucleophilic cobalt catalysts. A single-electron-transfer-type oxidative addition is a pivotal process in the well-established nickel-catalyzed coupling of alkyl halides. However, the method cannot be applied to the homo-coupling of ubiquitous alkyl tosylates due to the high-lying σ*(C–O) orbital of the tosylates. This paper describes a Ni/Co-catalyzed protocol for the activation of alkyl tosylates on the construction of alkyl dimers under mild conditions.

Cobalt Catalysts Preparation and Characterization over Alumina Support for Fischer Tropsch Synthesis

2017 ◽  
Vol 2 (1) ◽  
pp. 51-61
Author(s):  
Nima Mohammadi Taher ◽  
Maedeh Mahmoudi ◽  
Seyyede Shahrzad Sajjadivand
Keyword(s):  
Surface Area ◽  
Cobalt Catalyst ◽  
Cobalt Content ◽  
Tropsch Synthesis ◽  
Cobalt Catalysts ◽  
Fischer Tropsch ◽  
Alumina Support ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
Temperature Programmed

Abstract An investigation was done to develop and characterize the alumina supported cobalt catalyst for Fischer-Tropsch Synthesis to produce biodiesel from biomass with the aim to produce alumina-supported cobalt catalysts containing 7 to 19 wt.% cobalt content. By using incipient wetness impregnation of γ-Al2O3 supports with cobalt nitrate hexahydrate with ethanol and distilled water solutions; the 14 wt.% cobalt content in catalyst was achieved. Nitrogen adsorption-desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray fluorescence (XRF), H2temperature programmed reduction (H2-TPR), temperature programmed desorption (TPD), temperature programmed oxidation (TPO) and carbon monoxide chemisorption were used for the characterization of the catalysts to attain an appropriate cobalt catalyst. In order to investigate the effect of the impregnation on the crystalline size, surface area and cobalt content, three different impregnation methods with various durations were investigated. In addition, increasing the impregnation duration increased the cobalt content and its dispersion. Based on results, positive effect of the alumina support and impregnation duration on the crystallite size, surface area, and pore diameter, reducibility of the catalyst and cobalt dispersion were investigated. Thus, cobalt catalyst for using in fixed bed reactor to produce biodiesel from biomass through Fischer-Tropsch Synthesis was prepared and characterized.

A versatile bi-metallic copper–cobalt catalyst for liquid phase hydrogenation of furfural to 2-methylfuran

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 1649-1658 ◽  
Author(s):  
Sanjay Srivastava ◽  
G. C. Jadeja ◽  
Jigisha Parikh
Keyword(s):  
Liquid Phase ◽  
Cobalt Catalyst ◽  
Metallic Copper ◽  
Cobalt Catalysts ◽  
Liquid Phase Hydrogenation ◽  
One Step

This work presents the application of bi-metallic copper–cobalt catalysts towards one step hydrogenation of furfural to 2-methylfuran in liquid phase.

Tailored Cobalt‐Catalysts for Reductive Alkylation of Anilines with Carboxylic Acids under Mild Conditions

2018 ◽  
Vol 57 (36) ◽  
pp. 11673-11677 ◽  
Author(s):  
Weiping Liu ◽  
Basudev Sahoo ◽  
Anke Spannenberg ◽  
Kathrin Junge ◽  
Matthias Beller
Keyword(s):  
Carboxylic Acids ◽  
Cobalt Catalysts ◽  
Reductive Alkylation ◽  
Mild Conditions

Enhanced catalytic activity of cobalt nanoparticles encapsulated with an N-doped porous carbon shell derived from hollow ZIF-8 for efficient synthesis of nitriles from primary alcohols in water

2019 ◽  
Vol 21 (16) ◽  
pp. 4334-4340 ◽  
Author(s):  
Kang-kang Sun ◽  
Jia-lin Sun ◽  
Guo-Ping Lu ◽  
Chun Cai
Keyword(s):  
Catalytic Activity ◽  
Shell Structure ◽  
Cobalt Catalyst ◽  
Cobalt Nanoparticles ◽  
Core Shell ◽  
Efficient Synthesis ◽  
Primary Alcohols ◽  
Mild Conditions ◽  
Core Shell Structure ◽  
Unique Core

A cobalt catalyst derived from a unique core–shell structure based on hollow ZIF-8 and ZIF-67 is prepared for the synthesis of nitriles from alcohols in water under mild conditions.

THE KINETICS OF THE REACTION OF ACTIVE NITROGEN WITH ETHYLENE

1962 ◽  
Vol 40 (4) ◽  
pp. 686-691 ◽  
Author(s):  
E. M. Levy ◽  
C. A. Winkler
Keyword(s):  
Nitric Oxide ◽  
Activation Energy ◽  
Low Temperature ◽  
Copper Oxide ◽  
Cobalt Catalyst ◽  
Cobalt Catalysts ◽  
Active Nitrogen ◽  
Temperature Range ◽  
P Factor ◽  
Kinetics Of

A comparison has been made of five methods for terminating the reaction of active nitrogen with ethylene in the temperature range 295° to 673° K. These were based on deactivating the active nitrogen by low-temperature trapping, by addition of nitric oxide, and by passing it over copper oxide or cobalt catalysts. With the nitric oxide and cobalt catalyst techniques, which appeared to be the most reliable of those used, an activation energy of 400 ± 200 cal/mole, with a P factor of about 10−5, have been determined for the reaction.

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