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

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.

Particle size effect in liquid-phase hydrogenation of phenylacetylene over Pd catalysts: Experimental data and theoretical analysis

2019 ◽  
Vol 358 ◽  
pp. 520-530 ◽  
Author(s):  
Pavel V. Markov ◽  
Igor S. Mashkovsky ◽  
Galina O. Bragina ◽  
Johan Wärnå ◽  
Evgenii Yu. Gerasimov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Liquid Phase ◽  
Theoretical Analysis ◽  
Size Effect ◽  
Particle Size Effect ◽  
Pd Catalysts ◽  
Liquid Phase Hydrogenation

Deactivation of silica supported Pd catalysts during liquid-phase hydrogenation

2005 ◽  
Vol 86 (1) ◽  
pp. 141-147 ◽  
Author(s):  
Joongjai Panpranot ◽  
Kanda Pattamakomsan ◽  
Piyasan Praserthdam
Keyword(s):  
Liquid Phase ◽  
Pd Catalysts ◽  
Liquid Phase Hydrogenation ◽  
Supported Pd Catalysts ◽  
Supported Pd

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.

The effect of preparation conditions of a platinum hydrogentaion catalyst on its activity and on the dispersity of platinum crystallites

1979 ◽  
Vol 44 (9) ◽  
pp. 2619-2623 ◽  
Author(s):  
Jiří Hanika ◽  
Karel Sporka ◽  
Vlastimil Růžička ◽  
Jaroslav Bauer
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Hydrogen Chloride ◽  
Active Carbon ◽  
Hydrogenation Catalyst ◽  
Chloroplatinic Acid ◽  
Metallic Platinum ◽  
Preparation Conditions

The paper deals with the preparation of a hydrogenation catalyst, 5% of platinum on active carbon. The support was saturated with aqueous chloroplatinic acid or platinum tetrachloride. After calcination in streaming nitrogen the catalyst was reduced with hydrogen. We studied the effects of temperatures of the calcination and the reduction on 1) the formation of hydrogen chloride in the course of calcination and the following reduction, 2) the dispersity of metallic platinum and 3) the catalytic activity for hydrogenation of 2-methyl-3-butene-2-ol and nitrobenzene in liquid phase. The catalytic activity was found to be proportional to the dispersity of platinum.

Liquid-phase hydrogenation of maleic anhydride over Pd/SiO2: effect of tin on catalytic activity and deactivation

2003 ◽  
Vol 198 (1-2) ◽  
pp. 297-302 ◽  
Author(s):  
Seong Moon Jung ◽  
Eric Godard ◽  
Sang Yun Jung ◽  
Kwang-Cheon Park ◽  
Jung Uk Choi
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Maleic Anhydride ◽  
Liquid Phase Hydrogenation
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