scholarly journals Highly Efficient Liquid-Phase Hydrogenation of Naringin Using a Recyclable Pd/C Catalyst

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 46
Author(s):  
Jiamin Zhao ◽  
Ying Yuan ◽  
Xiuhong Meng ◽  
Linhai Duan ◽  
Rujin Zhou
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Sodium Hydroxide ◽  
Catalyst Surface ◽  
Hydrogenation Reaction ◽  
Hydrogenation Process ◽  
Highly Efficient ◽  
Liquid Phase Hydrogenation ◽  
Palladium On Carbon

A highly efficient liquid-phase hydrogenation reaction using a recyclable palladium on carbon (Pd/C) catalyst has been used for the transformation of naringin to its corresponding dihydrochalcone. The effects of various solvents on the hydrogenation process were studied, with water being identified as the optimal solvent. The analysis also revealed that sodium hydroxide (NaOH) can accumulate on the surface of the Pd/C catalyst in alcoholic solvents, leading to its inactivation. The higher solubility of NaOH in water implies that it remains in solution and does not accumulate on the Pd/C catalyst surface, ensuring the catalytic activity and stability.

Liquid-Phase Hydrogenation to 2, 4-Tolylenediamine over Supported HY Catalysts

2012 ◽  
Vol 512-515 ◽  
pp. 2381-2385
Author(s):  
Xue Mei Zhang ◽  
Feng Xing Niu
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Catalytic Hydrogenation ◽  
Active Component ◽  
Experimental Results ◽  
Mass Ratio ◽  
Liquid Phase Hydrogenation ◽  
Catalytic Test

We have successfully prepared a novel passivation Ni/HY catalyst by the technologies of macerate-precipitatio.The catalysts are comprised of two contents: HY as carrier, Ni as active component，and we put it into the process of preparating aromatic amines.The nature of the catalysts was discussed based on the characterization results of BET , IR , SEM , XRD , TEM ,TPD , XPS and TPR . The catalytic hydrogenation technology for 2,4-dinitrobenzene in liquid phase can be an attractive and elegant routine for production of 2,4-tolylenediamine. The catalytic activity is evaluated at 2.2 MPa, 90 °C, 750r/min, solvent with reaction materials mass ratio of 60, catalyst with reaction materials mass ratio of 0.1. In the catalytic test, The experimental results over the catalyst showed that 2,4-dinitrobenzene and 2,4-tolylenediamine conversion and selective of 99.88% and 99.16% were obtained respectively.It is found that the catalyst is highly dispersion, stable, and reusable. No obvious deactivation of the catalyst was observed after repeated using twelve times.

scholarly journals Solvent-free hydrogenation of cyclohexene over Rh-TUD-1 at ambient conditions

RSC Advances ◽  
2018 ◽  
Vol 8 (60) ◽  
pp. 34370-34373 ◽  
Author(s):  
Mhamed Benaissa ◽  
Abdullah M. Alhanash ◽  
Ahmed T. Mubarak ◽  
Morad Eissa ◽  
Taher Sahlabji ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Room Temperature ◽  
Hydrogenation Reaction ◽  
Solvent Free ◽  
Ambient Conditions ◽  
Total Conversion ◽  
Free System ◽  
Liquid Phase Hydrogenation ◽  
System P ◽  
Solvent Free System

Total conversion of cyclohexene to cyclohexane was achieved in a liquid phase hydrogenation reaction at room temperature, 1 atm H2 pressure and solvent-free system.

Pd/SiO2–AlPO4 systems. Influence of the preparation variables on their catalytic activity

1985 ◽  
Vol 63 (12) ◽  
pp. 3471-3477 ◽  
Author(s):  
A. Alba ◽  
M. A. Aramendia ◽  
V. Borau ◽  
C. Jimenez ◽  
J. M. Marinas
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Reaction Temperature ◽  
Hydrogen Pressure ◽  
Pd Catalysts ◽  
Metal Precursor ◽  
Preparation Conditions ◽  
Liquid Phase Hydrogenation ◽  
Initial Hydrogen Pressure ◽  
Catalyst Reduction

A study on the liquid phase hydrogenation of cyclohexene over a series of Pd catalysts supported on various SiO2–AlPO4 systems (using a concentration of 2.47 M, with methanol as solvent, the initial hydrogen pressure is 5 bar and reaction temperature 300 K) is reported in this paper. The reaction has been studied as a standard in order to determine the most suitable preparation conditions for these catalystsWe have also studied the influence of other factors such as the kind of support, the nature of the metal precursor, the previous calcination of the precursor, the addition of alkaline hydroxides, and the catalyst reduction with various agents, on the catalytic activity of different Pd-supported systems

Pt nanoparticles supported on YCoxFe1−xO3 perovskite oxides: highly efficient catalysts for liquid-phase hydrogenation of cinnamaldehyde

2019 ◽  
Vol 55 (23) ◽  
pp. 3363-3366 ◽  
Author(s):  
Yujie Xue ◽  
Huiyue Xin ◽  
Wenhui Xie ◽  
Peng Wu ◽  
Xiaohong Li
Keyword(s):  
Liquid Phase ◽  
Selective Hydrogenation ◽  
Pt Nanoparticles ◽  
Perovskite Oxides ◽  
Cinnamyl Alcohol ◽  
Highly Efficient ◽  
Liquid Phase Hydrogenation ◽  
Full Conversion

The Pt/YCo0.3Fe0.7O3 catalyst furnished ca. 95% selectivity to cinnamyl alcohol at nearly full conversion for the selective hydrogenation of cinnamaldehyde.

Granulated Carbon Nanotubes as the Catalyst Support for Pt for the Hydrogenation of Nitrobenzene

2010 ◽  
Vol 63 (1) ◽  
pp. 131 ◽  
Author(s):  
Shao Jin ◽  
Weizhong Qian ◽  
Yi Liu ◽  
Fei Wei ◽  
Dezeng Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Mass Transfer ◽  
Catalytic Activity ◽  
Activated Carbon ◽  
Liquid Phase ◽  
Transfer Rate ◽  
High Selectivity ◽  
Mass Transfer Rate ◽  
Catalyst Support ◽  
Liquid Phase Hydrogenation

Granulated Pt/carbon nanotubes (CNTs) were found to have a much better catalytic activity in the liquid phase hydrogenation of nitrobenzene than Pt/activated carbon (AC). The granulated CNTs had much larger pores than the AC particles, which gave a faster mass transfer rate of H2 that helped produce aniline with high selectivity.

Few-layer graphene supporting palladium nanoparticles with a fully accessible effective surface for liquid-phase hydrogenation reaction

2012 ◽  
Vol 189 (1) ◽  
pp. 77-82 ◽  
Author(s):  
Tri Truong-Huu ◽  
Kambiz Chizari ◽  
Izabela Janowska ◽  
Maria Simona Moldovan ◽  
Ovidiu Ersen ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Palladium Nanoparticles ◽  
Hydrogenation Reaction ◽  
Effective Surface ◽  
Layer Graphene ◽  
Liquid Phase Hydrogenation ◽  
Few Layer Graphene

Effect of irradiation and of replacement of hydrogen by deuterium on the kinetics of hydrogenation of maleic acid on a nickel catalyst

1980 ◽  
Vol 45 (6) ◽  
pp. 1632-1638 ◽  
Author(s):  
Rostislav Kudláček ◽  
Růžena Jelínková
Keyword(s):  
Reaction Rate ◽  
Catalyst Surface ◽  
Catalyst Activity ◽  
Hydrogenation Reaction ◽  
Gamma Dose ◽  
Model Reaction ◽  
Solid Catalyst ◽  
Liquid Phase Hydrogenation ◽  
Kinetics Of ◽  
Preliminary Irradiation

Liquid phase hydrogenation reaction was studied on modifying the solid catalyst by preliminary irradiation and replacing the reacting hydrogen by deuterium; the changes in the reaction rate were measured and the phenomena on the catalyst surface, particularly the change in the catalyst activity, were investigated. For the model reaction, the dependences of the reaction rate on the temperature of reduction and of the successive activation of the catalyst on the absorbed gamma dose were followed, and the dependences of the reaction rate on the reaction temperature were compared for the hydrogenation and deuteration. Isotope effect was found in the influence of the reacting medium on the catalyst property. The activity of the nickel carrier catalyst is governed by its interaction with hydrogen after the reduction, particularly by the temperature of this process.

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