scholarly journals Influence of the addition of Pd and Cu to cobalt catalysts prepared by SMAI for F-T synthesis

2007 ◽  
Vol 5 (1) ◽  
pp. 144-155 ◽  
Author(s):  
Li-hua Yu ◽  
Shou-min Zhang ◽  
Xianzhi Guo ◽  
Da Wang ◽  
Shu-rong Wang ◽  
...  
Keyword(s):  
Metal Atom ◽  
Co Hydrogenation ◽  
Magnetic Measurements ◽  
Weight Ratio ◽  
Cobalt Catalysts ◽  
Metallic State ◽  
Fischer Tropsch ◽  
Superparamagnetic Behavior ◽  
Highly Dispersed ◽  
Ft Ir

AbstractThe Co-Pd/SiO2 and Co-Cu/SiO2 catalysts were prepared via solvated metal atom impregnation (SMAI) method and investigated for the Fischer-Tropsch (F-T) synthesis. The catalysts contained 5wt.% Co and a weight ratio of Pd (or Cu) to Co of 1/30. XPS indicated that Co, Pd and Cu were in metallic state. The results of XPS and magnetic measurements showed that Co and Pd (Cu) were alloyed. The Co particles on the catalysts were very highly dispersed and they displayed superparamagnetic behavior. FT-IR indicated that the electrons shifted from Cu and Pd to Co. Catalytic tests showed that CO hydrogenation rates followed the order Pd-Co > Cu-Co > Co.

Highly Dispersed Cobalt Catalysts for CO Hydrogenation

Ecomaterials ◽  
1994 ◽  
pp. 417-420
Author(s):  
T. Matsuzaki ◽  
K. Takeuchi ◽  
T. Hanaoka ◽  
H. Arakawa ◽  
Y. Sugi
Keyword(s):  
Co Hydrogenation ◽  
Cobalt Catalysts ◽  
Highly Dispersed

Plasma-Assisted Preparation of Highly Dispersed Cobalt Catalysts for Enhanced Fischer–Tropsch Synthesis Performance

ACS Catalysis ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 6177-6185 ◽  
Author(s):  
Jingping Hong ◽  
Juan Du ◽  
Bo Wang ◽  
Yuhua Zhang ◽  
Chengchao Liu ◽  
...  
Keyword(s):  
Tropsch Synthesis ◽  
Cobalt Catalysts ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Highly Dispersed

Improvement of C–C Coupling Using SiC as a Support of Cobalt Catalysts in Fischer Tropsch Synthesis

2021 ◽  
Author(s):  
Gisele Westphalen ◽  
Maria A. S. Baldanza ◽  
Antônio José de Almeida ◽  
Vera Maria Martins Salim ◽  
Mônica Antunes Pereira da Silva ◽  
...  
Keyword(s):  
Tropsch Synthesis ◽  
Cobalt Catalysts ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

scholarly journals Highly dispersed Pt atoms and clusters on hydroxylated indium tin oxide: A view from first-principles calculations

2021 ◽  
Author(s):  
Simran Kumari ◽  
Philippe Sautet
Keyword(s):  
Heterogeneous Catalysis ◽  
Metal Atom ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
First Principles ◽  
Catalytic Performance ◽  
Small Cluster ◽  
Single Atom ◽  
First Principles Calculations ◽  
Highly Dispersed

Supported single-atom and small cluster catalysts have become highly popular in heterogeneous catalysis. These catalysts can maximize the metal atom utilization while still showcasing superior catalytic performance. One of the...

Graft Copolymerization of Acrylamide onto Activated Starch Using Inverse Emulsion Polymerization

2011 ◽  
Vol 308-310 ◽  
pp. 600-605
Author(s):  
Dian Mo Zheng ◽  
Sheng Gan Zhu ◽  
Li Ping Wu
Keyword(s):  
Ball Milling ◽  
Graft Copolymerization ◽  
Chemical Reactivity ◽  
Weight Ratio ◽  
Monomer Conversion ◽  
Ammonium Persulfate ◽  
Grafting Efficiency ◽  
Inverse Emulsion ◽  
Initiation System ◽  
Ft Ir

Activated starch was prepared by ball milling before used. Graft copolymerization of acrylamide onto activated starch was carried out in inverse emulsion using a redox initiation system of ammonium persulfate and sodium bisulfite. The effects of ball-milling time, reaction temperature, initiator concentration and weight ratio of acrylamide to starch on the conversion of monomer, grafting percentage and grafting efficiency were studied. The structure and properties of the graft copolymer and activated starch were characterized by FT-IR, XRD and SEM. The results showed that ball milling could progressively destroy the crystalline structure of starch and improve the chemical reactivity. The monomer conversion, grafting percentage and grafting efficiency of grate copolymerization were 96.6%、62.4%、85.49%, respectively.

Nitroxide radicals appended to phthalonitriles: synthesis, structural characterization and photophysical properties

2021 ◽  
Vol 77 (3) ◽  
pp. 137-143
Author(s):  
Ismail Fidan ◽  
Emel Onal ◽  
Catherine Hirel
Keyword(s):  
Magnetic Measurements ◽  
Photophysical Properties ◽  
Nucleophilic Aromatic Substitution ◽  
Structural Studies ◽  
Aromatic Substitution ◽  
Nitronyl Nitroxide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted ◽  
Ft Ir

The syntheses of 4-[4-(4,4,5,5-tetramethyl-2-imidazoline-3-oxide-1-oxyl-2-yl)phenoxy]phthalonitrile (3, C21H19N4O3) and 4-[4-(4,4,5,5-tetramethyl-2-imidazoline-1-oxyl-2-yl)phenoxy]phthalonitrile (4) were carried out by microwave-assisted nucleophilic aromatic substitution of 4-nitrophthalonitrile (2) by the pre-formed 2-(4-hydroxyphenyl)-4,4,5,5-tetramethyl-2-imidazoline-3-oxide-1-oxyl (1). Compounds 3 and 4 were characterized unambiguously by a rich array of analyses, such as melting point, FT–IR, MALDI–TOF MS, elemental analysis, UV–Vis, CV, EPR, magnetic measurements and single-crystal X-ray diffraction. Structural studies demonstrate that the C—H...X and C—X...π (X = O and N) interactions in the radical nitronyl nitroxide groups play an important role in the assembly of the crystal structures. Moreover, cyclic voltammetry analyses show that the phthalonitrile substituent retains the redox properties of the Ullman radicals.

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