NMR of platinum catalysts. III. Microscopic variation of the Knight shifts

1982 ◽  
Vol 26 (7) ◽  
pp. 3575-3581 ◽  
Author(s):  
Harold T. Stokes ◽  
Howard E. Rhodes ◽  
Po-Kang Wang ◽  
Charles P. Slichter ◽  
J. H. Sinfelt
Keyword(s):  
Platinum Catalysts ◽  
Knight Shifts

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

Electrochemical oxidation of CO over tin oxide supported platinum catalysts

2006 ◽  
Vol 155 (2) ◽  
pp. 152-156 ◽  
Author(s):  
Toshiaki Matsui ◽  
Katsuhiko Fujiwara ◽  
Takeoh Okanishi ◽  
Ryuji Kikuchi ◽  
Tatsuya Takeguchi ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Tin Oxide ◽  
Platinum Catalysts ◽  
Oxidation Of Co ◽  
Supported Platinum ◽  
Supported Platinum Catalysts

Nanotubular OMS-2 Supported Single-Atom Platinum Catalysts Highly Active for Benzene Oxidation

2021 ◽  
Author(s):  
Xiuqing Hao ◽  
Lingyun Dai ◽  
Jiguang Deng ◽  
Yuxi Liu ◽  
Lin Jing ◽  
...  
Keyword(s):  
Platinum Catalysts ◽  
Single Atom ◽  
Benzene Oxidation ◽  
Highly Active
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