Platinum Catalysts Based on Zeolites and Modified Aluminium Oxide in the Joint Hydroisomerization of Heptane and Benzene

2016 ◽  
Vol 24 (1) ◽  
Keyword(s):  
Platinum Catalysts ◽  
Aluminium Oxide

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.

Methods to Determine Phytopharmaceuticals in Tobacco and Tobacco Products. 4th Report: A Procedure to Determine Vamidothion and its Metabolites/Methoden zur Bestimmung von Phytopharmaka in Tabak und Tabakerzeugnissen: IV. Mitteilung: Ein Bestimmungsverfahren fuer Vamidothion und seine Metaboliten

1977 ◽  
Vol 9 (2) ◽  
Author(s):  
A.N. Sagredos ◽  
R. Moser
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Acetic Acid ◽  
Magnetic Resonance ◽  
Aluminium Oxide ◽  
Nuclear Magnetic Resonance Data ◽  
Gas Chromatograph ◽  
Tobacco Products ◽  
Magnetic Resonance Data ◽  
Resonance Data

AbstractBased on previous work (7) a method to simultaneously determine vamidothion [I], vamidothion-sulfoxide [II] and vamidothion sulfone [III] in tobacco has been developed. The compounds are extracted with water/acetone/acetic acid from the tobacco, cleansed over an aluminium oxide column and then determined on the gas chromatograph with the specific sulphur detector. Rates of recovery are 70 % - 92 %, the determination level is 0.1 ppm. Mass spectrometry and nuclear magnetic resonance data of vamidothion [I], vamidothion-sulfoxide [ II ] and vamidothion-sulfone [III] are given.

Testing Aluminium Oxide based Ceramics at Irregular Interrupted Cut

2013 ◽  
Vol 10 (2) ◽  
pp. 26-28
Author(s):  
Ladislav Kyncl ◽  
Robert Cep ◽  
Pavel Novacek ◽  
Jiri Schreier
Keyword(s):  
Aluminium Oxide ◽  
Cutting Effect ◽  
Intermittent Cutting

Abstract This article discusses the test removable ceramic plates during machining with interrupted cut. Tests were performed on a lathe, which was clamped preparation which simulated us the interrupted cut. By changing the number plates mounted in a preparation it was a regular or irregular cut. When with four plates it was regular interrupted cut, the remaining three variants were already irregular cut. It was examined whether it will have the irregular intermittent cutting effect on the insert and possibly how it will change life of inserts during irregular interrupted cut.

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
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