PRESSED PARTS BASED ON SILICON DIOXIDE PRODUCED BY VIA PIROGENA, PROCEDURE FOR ITS MANUFACTURE AND USE.

摘要

PIECES PRESSED BASED ON SILICON DIOXIDE OBTAINED PYROGENICALLY WITH THE FOLLOWING PHYSICAL - CHEMICAL CHARACTERISTICS: OUTER DIAMETER 2 TO 15 MM BET SURFACE 50 TO 400 M (SQUARE) / G PORE VOLUME 0.6 TO 1.3 ML / G RESISTANCE AT BREAK 40 TO 120 N PORE DISTRIBUTION NO PORE WITH DIAMETER LESS THAN 5 NM; AT LEAST 80% HAVE A DIAMETER BETWEEN 5 AND 40 NM. COMPOSITION 95% OF WEIGHT SIO2; REST, AL2O3. PRODUCED BY COMPACTING SILICON DIOXIDE OBTAINED PYROGENICALLY WITH KAOLIN AND / OR GRAPHITE, SUGAR, STARCH, UREA, WAX, UNDER WATER ADDITION. THIS DRIES AT A TEMPERATURE OF 80 TO 120 (DEGREES) C, CRUSHING THEN TO FORM A POWDER. THIS POWDER IS COMPRESSED TO FORM THE PRESSED PARTS AND TEMPERED FOR 0.5 TO 6 SECONDS AT A TEMPERATURE OF 400 TO 1200 (DEGREES) C. THE PRESSED PARTS MAY BE USED AS A CATALYZER CARRIER OR CATALYST.