Study of Benzene Hydrogenation on Ni/Bentonite Catalyst

2011 ◽  
Vol 287-290 ◽  
pp. 1708-1711
Author(s):  
Rong Bin Zhang ◽  
Liang Wang ◽  
Yan Ju
Keyword(s):  
Catalytic Activity ◽  
Strong Interaction ◽  
Ni Catalyst ◽  
Hydrogen Chemisorption ◽  
Benzene Hydrogenation ◽  
Particle Sizes ◽  
Reaction Condition

Ni-based catalysts supported on bentonite, Al2O3 and SiO2 were prepared and characterized by the techniques of BET, XRD, TPR, H2-TPD. Benzene hydrogenation was chosen as a probe reaction to evaluate the catalytic activity and the results shown that bentonite supporting Ni catalyst(Ni/Bentonite) was more active than catalysts supported on Al2O3 and SiO2 in benzene hydrogenation. XRD and hydrogen chemisorption analyses indicated that the higher activity of Ni/Bentonite could be associated with the smaller particle sizes and better dispersion of Ni. The strong interaction between Ni and bentonite support might prevent the growth of Ni particles, as evidenced by TPR results. TPD analysis demonstrated that Ni/Bentonite adsorbed more hydrogen under reaction condition, thus resulting in its higher activity.

Preparation and Characterization of Bulk and Supported NiB Amorphous Alloy Catalysts with Different Particle Sizes

2007 ◽  
Vol 121-123 ◽  
pp. 637-640
Author(s):  
Lai Jun Wang ◽  
Wei Li ◽  
M.H. Zhang ◽  
K.Y. Tao
Keyword(s):  
Amorphous Alloy ◽  
Electroless Plating ◽  
Chemical Reduction ◽  
Reaction System ◽  
Catalytic Performance ◽  
Ni Catalyst ◽  
Particle Sizes ◽  
Raney Ni ◽  
Reduction Methods ◽  
Alloy Catalysts

A series of bulk and supported NiB amorphous alloy catalysts with different particle sizes were prepared by different chemical reduction methods. By adding a certain volume of NH3 to the reaction system and adjusting the reaction temperature, respectively, the velocity of the reaction between Ni2+ and BH4 - could be controlled and the NiB alloys with particle sizes ranging from 10 to 400nm were obtained. A novel method to prepare the supported NiB catalyst, the powder electroless plating method was also studied. The bulk and supported NiB catalysts were characterized by XRD, ICP and TEM. Hydrogenation of sulfolene was selected as the probe reaction to investigate their catalytic performance. The results revealed that the NiB/MgO prepared by Ag inducing electroless plating showed much higher catalytic activity than Raney Ni catalyst, and the powder electroless plating was a promising method to prepare the supported NiB amorphous alloy catalysts.

scholarly journals Structurally ordered Pt–Zn/C series nanoparticles as efficient anode catalysts for formic acid electrooxidation

2015 ◽  
Vol 3 (44) ◽  
pp. 22129-22135 ◽  
Author(s):  
Jing Zhu ◽  
Xin Zheng ◽  
Jie Wang ◽  
Zexing Wu ◽  
Lili Han ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Formic Acid ◽  
Particle Sizes ◽  
Anode Catalysts ◽  
Formic Acid Electrooxidation

Structurally ordered Pt3Zn and PtZn nanoparticles with ultrasmall particle sizes were obtained and exhibited enhanced catalytic activity toward HCOOH electrooxidation.

Chitosan: A Natural and Sustainable Polymeric Organocatalyst for C-C Bond Formation During the Synthesis of 5-amino-2,3-dihydrobenzo[d] thiazole-4,6-dicarbonitriles

2019 ◽  
Vol 6 (1) ◽  
pp. 69-76
Author(s):  
Km N. Shivhare ◽  
Ibadur R. Siddiqui
Keyword(s):  
Catalytic Activity ◽  
Multicomponent Reaction ◽  
Bond Formation ◽  
Environmentally Benign ◽  
One Pot ◽  
Reaction Condition ◽  
Three Component Reaction ◽  
Efficient Route

Background: A green, recyclable and reusable chitosan catalyst has been utilized for the synthesis of 5-amino-2,3-dihydrobenzo[d]thiazole-4,6-dicarbonitrile and its derivatives. Methods and Results: Three-component reaction protocol incorporates the reaction of aldehydes, malononitrile and rhodanine derivatives. This is examined as an efficient route for the synthesis of dicarbonitriles utilizing a green, biodegradable, environmentally benign, and easily available chitosan catalyst. In the reported protocol, catalyst can be recycled and not any substantial dropping in its catalytic activity during the recycling steps was obtained. Conclusion: A green and environmentally benign, one pot three-component protocol has been illustrated for the synthesis of 5-amino-2,3-dihydrobenzo[d]thiazole-4,6-dicarbonitrile derivatives. Adequately yield products were gained via the natural catalytic approach with the recyclability of the catalyst. The use of chitosan represents this procedure as an attractive substitute for the synthesis of biaryls complex by multicomponent reaction condition.

A porphyrin-stabilized iridium oxide water oxidation catalyst

2011 ◽  
Vol 89 (2) ◽  
pp. 152-157 ◽  
Author(s):  
Benjamin D. Sherman ◽  
Smitha Pillai ◽  
Gerdenis Kodis ◽  
Jesse Bergkamp ◽  
Thomas E. Mallouk ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Catalytic Activity ◽  
Strong Interaction ◽  
Water Oxidation ◽  
Iridium Oxide ◽  
Oxidation Catalyst ◽  
Porphyrin Ring ◽  
Oxygen Quenching ◽  
Applied Potential ◽  
Colloidal Solutions

Colloidal solutions of iridium oxide hydrate (IrO2·nH2O) were formed using porphyrin stabilizers bearing malonate-like functional groups at each of the four meso positions of the porphyrin ring. Cyclic voltammetry and monitoring of solution oxygen concentrations under constant applied potential demonstrated the electrochemical catalytic activity of the porphyrin–IrO2·nH2O complexes for the oxidation of water to oxygen. Quenching of the porphyrin fluorescence in the complex implies strong interaction between the porphyrin and the IrO2·nH2O. These results mark a step toward developing a porphyrin-based photoanode for use in a photoelectrochemical water-splitting cell.

Effects of methoxy-substituted metalloporphyrins in catalytic alkene epoxidation by n-Bu4NHSO5

2010 ◽  
Vol 14 (04) ◽  
pp. 335-342 ◽  
Author(s):  
Amineh Aghabali ◽  
Nasser Safari
Keyword(s):  
Hydrogen Bonding ◽  
Catalytic Activity ◽  
High Activity ◽  
Solvent Mixture ◽  
Steric Effects ◽  
Reaction Condition ◽  
Reaction Solution ◽  
Phenyl Rings ◽  
Active Intermediate ◽  
The Stability

TPPMnOAc and four different kinds of manganese tetraphenylporphyrin acetates were synthesized using different numbers of methoxy substituents in various positions of the phenyl rings. These porphyrins were used as catalysts in the epoxidation of various alkenes with tetra-n-butylammonium hydrogen monopersulfate (n- Bu 4 NHSO 5) as the oxidant and imidazole as the axial base. The following order of catalytic activity was obtained: TPPMnOAc ≥ T (2,3- OMeP ) PMnOAc > T (4- OMeP ) PMnOAc > T (3,4- OMeP ) PMnOAc > T (2,4,6- OMeP ) PMnOAc . By studying the UV-vis spectra in the reaction solution, the stability of the applied methoxy porphyrins and the effect of this factor on obtained yields were investigated. Lower catalytic activity in some of the methoxy porphyrins emphasized steric effects and special hydrogen bonding among the reaction elements. However, the stability of T (2,3- OMeP ) PMnOAc under our reaction condition was considerable and high activity was observed. By adding small amounts of alcohol to the reaction solution, the effect of the solvent mixture was previewed and steps were taken to identify the active intermediate of the catalyst in these conditions.

Highly crystalline, small sized, monodisperse α-NiS nanocrystal ink as an efficient counter electrode for dye-sensitized solar cells

2015 ◽  
Vol 3 (31) ◽  
pp. 15905-15912 ◽  
Author(s):  
Xiuwen Wang ◽  
Buhe Batter ◽  
Ying Xie ◽  
Kai Pan ◽  
Yongping Liao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Solar Cells ◽  
Strong Interaction ◽  
Active Sites ◽  
Counter Electrode ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

α-NiS nanocrystals exhibit excellent catalytic activity for I3− reduction due to the strong interaction between I1 and α-NiS active sites.

Novel dendrimer-based nickel catalyst: synthesis, characterization and performance in ethylene oligomerization

2014 ◽  
Vol 68 (11) ◽  
Author(s):  
Jun Wang ◽  
Guang Yang ◽  
Cui-Qin Li ◽  
Wei-Guang Shi ◽  
Si-Han Wang
Keyword(s):  
Catalytic Activity ◽  
Nickel Complex ◽  
Nickel Chloride ◽  
Negative Influence ◽  
Ethylene Oligomerization ◽  
Ni Catalyst ◽  
Catalyst Precursor ◽  
Elemental Analyses ◽  
And Performance ◽  
Complexation Reactions

AbstractA novel nickel metallodendrimer was synthesized with poly(amidoamine), 3,5-di-tert-butyl-2-hydroxy-benzaldehyde and nickel chloride via the Schiff’s base and the complexation reactions. Structures of the dendritic ligand and its nickel complex were characterized by IR, NMR, UV, ESI-MS and elemental analyses. This new nickel metallodendrimer as a catalyst precursor, together with methylaluminoxane as an activator, was evaluated in the ethylene oligomerization. Under the conditions of 0.5 h, 0.5 MPa, 25°C and Al/Ni mole ratio 500: 1 employed for the nickel complex, the catalytic activity showed a maximum value of 4.93 × 105 grams per mole of Ni catalyst per hour. Substituents on the benzene ring seem to have a negative influence on the catalytic activity of the complex.

Amorphous PtNiP particle networks of different particle sizes for the electro-oxidation of hydrazine

RSC Advances ◽  
2015 ◽  
Vol 5 (84) ◽  
pp. 68655-68661 ◽  
Author(s):  
Yuanyuan Ma ◽  
Hui Wang ◽  
Weizhong Lv ◽  
Shan Ji ◽  
Bruno G. Pollet ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Temperature Control ◽  
Reaction Temperature ◽  
Control Method ◽  
Amorphous Structure ◽  
High Catalytic Activity ◽  
Particle Sizes ◽  
Hydrazine Oxidation ◽  
Electro Oxidation

Amorphous PtNiP particle networks with different particle sizes prepared via the reaction temperature control method showed high catalytic activity for hydrazine oxidation compared to the Pt and PtNi catalysts due to its porous, amorphous structure.

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