Hydrodehalogenation of hexachloro- and hexabromobenzene by metallic calcium in ethanol, in the presence of Rh/C catalyst

2016 ◽  
Vol 24 (1) ◽  
pp. 591-597 ◽  
Author(s):  
Yumi Katayama ◽  
Mitsuru Aoyagi ◽  
Takuya Matsumoto ◽  
Hiroyuki Harada ◽  
Alina M. Simion ◽  
...  
Keyword(s):  
Metallic Calcium

scholarly journals The electric discharge in monatomic gases

1908 ◽  
Vol 80 (536) ◽  
pp. 92-109 ◽  
Keyword(s):  
High Temperature ◽  
Electric Discharge ◽  
Inert Gases ◽  
Inert Gas ◽  
Electric Conduction ◽  
Spark Gap ◽  
Short Summary ◽  
First Results ◽  
Pure Helium ◽  
Metallic Calcium

In a recent paper one of us has described the use of metallic calcium at high temperature for the production of high vacua, and in spectroscopic work as a very perfect chemical absorbent of all except the chemically inert gases. It was shown that helium and argon purified by calcium from traces of common gases or vapours, with which they are in practice invariably contaminated during manipulation, showed a great disinclination to conduct the discharge. In ordinary spectrum-tubes, helium offered a resistance equivalent to an alternative spark-gap of an inch in air, at a pressure of 0·05 mm., and argon at 0·02 mm. of mercury. This behaviour of the monatomic gases, together with the closely-allied phenomenon shown by spectrum-tubes filled with these gases of becoming non-conducting, or “running out,” under the action of the discharge, have now been investigated in detail. A great number of experiments have been performed and a short summary will be given in the present paper. The main object was to settle whether electric conduction in the monatomic gases is essentially different from that in other gases. The first results raised at least a presumption that perfectly pure helium might be unable to conduct the discharge at all, so that the running out of spectrum-tubes might be due to the absorption of the impurities only by the electrodes and not by the absorption of the inert gas itself. This view, however, proved to be untenable.

scholarly journals On the discharge of negative electricity from hot Calcium and from Lime

1907 ◽  
Vol 79 (528) ◽  
pp. 96-97
Keyword(s):  
Electric Current ◽  
Discharge Tube ◽  
Pure Oxygen ◽  
Different Temperatures ◽  
Thermo Couple ◽  
Metallic Calcium

This paper contains an account of some experiments in which the negative leak from hot calcium was compared with that from platinum and from lime under similar conditions. The experiments were conducted in an atmosphere of argon or helium at a few millimetres pressure. The method of experimenting was as follows:—The negative leak from a platinum strip, heated by an electric current, was first investigated. The temperature of the strip was indicated by a thermo-couple of wires of platinum and platinum with 10 per cent, of rhodium, and the leak was measured by a delicate d’Arsonval galvanometer. Without changing the apparatus, the cathode was covered with metallic calcium by sublimation from an electrically heated calcium wire situated in the discharge tube near to the cathode. The negative leak from the calcium-covered cathode was determined at different temperatures. Some pure oxygen was then let into the apparatus and the calcium on the cathode was oxidised to lime. The excess of oxygen was then removed and the negative leak again measured. Finally, hydrogen was let into the apparatus and the effect of this gas on the negative leak from lime was investigated.

scholarly journals Self-ignition combustion synthesis of LaNi5 utilizing hydrogenation heat of metallic calcium

2010 ◽  
Vol 35 (20) ◽  
pp. 11035-11041 ◽  
Author(s):  
Naoto Yasuda ◽  
Shino Sasaki ◽  
Noriyuki Okinaka ◽  
Tomohiro Akiyama
Keyword(s):  
Combustion Synthesis ◽  
Metallic Calcium

Vapor Pressure of Metallic Calcium

1921 ◽  
Vol 18 (5) ◽  
pp. 362-368 ◽  
Author(s):  
Norman B. Pilling
Keyword(s):  
Vapor Pressure ◽  
Metallic Calcium

Efficiency in the Electrolytic Production of Metallic Calcium.

1910 ◽  
Vol 2 (12) ◽  
pp. 522-524 ◽  
Author(s):  
Francis C. Frary ◽  
Henry R. Bicknell ◽  
Carl A. Tronson
Keyword(s):  
Electrolytic Production ◽  
Metallic Calcium
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