CATALYST ON GRAPHITIZATION OF CARBON (II):Catalytic actions of various metallic elements
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概要
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In previous investigation<SUP>+</SUP>, it was found that some aluminosilicate minerals including sericite are effective as the catalyst on graphitization of carbon.<BR>Accordingly, this investigation was carried out in order to search the effective elements in the compositions of such minerals and any other catalyst in general, thus to systematize the catalytic actions of various metallic elements on graphitization.<BR>Metallic elements were used in a simple substance, oxide or carbonate according to the chemical properties of each element, as sodium was used in carbonate. Titanium dioxide, V<SUB>2</SUB>O<SUB>5</SUB>, Fe<SUB>2</SUB>O<SUB>3</SUB>, Au, Li<SUB>2</SUB>CO<SUB>3</SUB>, Ag, MgO, BaCO<SUB>3</SUB>, SrCO<SUB>3</SUB>, Mo, Pt, K<SUB>2</SUB>CO<SUB>3</SUB>, Zn, Al<SUB>2</SUB>O<SUB>3</SUB>, ZrO<SUB>2</SUB>, SiO<SUB>2</SUB>, Bi, Cr<SUB>2</SUB>O<SUB>3</SUB>, WO<SUB>3</SUB>, Se, Mn, CoO, Sn, Sb, Na<SUB>2</SUB>CO<SUB>3</SUB>, Cu, CaO, HgO, Pb, Cd, and Ni were tested. Each substance was admixed in carbon as its content becomes 0.5%, 1%, 2%, and 3% as a simple substance of metal. The results were as follows.<BR>The systematization of the catalyst on graphitization was failed, because each substance did not show the noticeable tendency on the catalytic action. Though titanium, iron, and vanadium showed the remarkable effects, the others showed very small or almost no effect. The order of catalytic effectiveness of each one on graphitization is shown above. Iron is the only effective element in the compositions of such minerals, but its action was less thin the the actions of such minerals in our experimental conditions. Iron also exhibits the purifying action, as sericite showed.<BR>In another experiments, the influece of heat-treatment temperature on the actions of Al, Al<SUB>2</SUB>O<SUB>3</SUB>, Si, SiO<SUB>2</SUB>, and SiC was examined. In this case, Al, Al<SUB>2</SUB>O<SUB>3</SUB>, Si, SiO<SUB>2</SUB> again showed almost no effect, as they already showed in the above experiment. but SiC was effective. For instance, the effect obtained by applying 4% of SiC was equivalent to that of the application of 5% of kaolinite, though it did not reach that of the application of 5% of scricite. From this fact, it is imagined that the formation or decomposition of metallic carbide may be part of the mechanism of catalytic action of ash. More, the fact that Si, SiO<SUB>2</SUB> of the raw substances of SiC are not effective notwith-standing SiC is effective is the subject of absorbing interest.
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