Competitive Hydrogenation of Benzene and Toluene on Palladium and Platinum Catalysts

1996 ◽  
Vol 161 (2) ◽  
pp. 742-751 ◽  
Author(s):  
Deepak Poondi ◽  
M. Albert Vannice
Keyword(s):  
Platinum Catalysts ◽  
Competitive Hydrogenation

Selectivities of some hydrogenations on metal-modified platinum catalysts

1983 ◽  
Vol 48 (12) ◽  
pp. 3532-3538
Author(s):  
Libor Červený ◽  
Karel Surma ◽  
Vlastimil Růžička ◽  
Ivo Paseka
Keyword(s):  
Atmospheric Pressure ◽  
Surface Coverage ◽  
Platinum Catalysts ◽  
Hydrogenation Rate ◽  
Competitive Hydrogenation

The rates and selectivities of hydrogenation on platinum catalysts modified with monolayers of copper, thallium, lead, or bismuth were studied at 20 °C and atmospheric pressure for the competitive hydrogenation of 1-hexene and 1-undecene in cyclohexane and for the consecutive hydrogenation of 1,5-cyclooctadiene in cyclohexane or ethanol. For the former system, the selectivity was unaffected by the modifying metal and the degree of the surface coverage with the metal, and the relative specific hydrogenation rate decreased only slightly with the degree of surface coverage. For the latter system, the selectivity of hydrogenation to cyclooctene increased with the content of the modifying metal, while the relative specific hydrogenation rate decreased markedly.

Divergent beam microanalysis studies of bimetallic platinum catalysts supported on γ-AL2O3

1995 ◽  
Vol 53 ◽  
pp. 428-429
Author(s):  
JR Fryer ◽  
Z Huang ◽  
D Stirling ◽  
G. Webb
Keyword(s):  
Dead Time ◽  
Platinum Catalysts ◽  
Beam Intensity ◽  
Beam Diameter ◽  
Divergent Beam ◽  
Bimetallic Systems ◽  
Reforming Catalyst ◽  
Before And After ◽  
Individual Particles

Platinum dispersed on γ-alumina is used as a reforming catalyst to convert linear hydrocarbons to cyclic aromatic products. To improve selectivity and lifetime of the catalyst, other elements are included, and we have studied the distributions of Pt/Re, and Pt/Sn, bimetallic systems on the support both before and after use in octane reforming. Often, one or both of the components are not resolvable by HREM or microanalysis as individual particles because of small size and lack of contrast on the alumina, and divergent beam microanalysis has been used to establish the presence and relationship between the two elements.In the majority of catalysts the platinum is in the form of small panicles, some of which are large enough to be resolvable in the microscope. The ABT002B microscope with Link windowless Pentafet detector, used in this work, was able to obtain a resolvable signal from particles of 2nm diameter upwards. When the beam was concentrated on to such a particle the signal was at a maximum, and as the beam diameter was diverged - at the same total beam intensity and dead time - the signal decreased as shown in Figure 1.

Development of production methods of different hydrophobizated platinum catalysts

2019 ◽  
Vol 20 (12) ◽  
pp. 552-557
Author(s):  
A.N. Bukin ◽  
◽  
V.S. Moseeva ◽  
S.A. Marunich ◽  
◽  
...  
Keyword(s):  
Platinum Catalysts ◽  
Production Methods

Competitive hydrogenation of olefinic substrates in multicomponent systems

1978 ◽  
Vol 43 (9) ◽  
pp. 2387-2394 ◽  
Author(s):  
Libor Červený ◽  
Dana Plecháčová ◽  
Vlastimil Růžička
Keyword(s):  
Multicomponent Systems ◽  
Competitive Hydrogenation
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