Catalyst preparation

摘要

Process for the preparation of catalysts comprising cobalt supported on a carrier. Cobalt is distributed over the carrier in such a manner as to satisfy the relation …$\dots \; by\; immersing\; a\; porous\; carrier\; once\; or\; several\; times\; in\; a\; solution\; of\; a\; cobalt\; compound,\; removing\; the\; liquid\; from\; the\; composition\; after\; each\; immersion\; and\; finally\; calcining\; and\; activating\; the\; composition.\; During\; each\; immersion\; the\; following\; relation\; between\; the\; viscosity\; measured\; at\; 60\; DEG\; C\; (v\; in\; cS)\; and\; the\; temperature\; (T\; in\; DEG\; K)\; of\; the\; solution,\; and\; the\; immersion\; time\; (t\; in\; s)\; is\; satisfied:\; \dots $ \dots \; SIGMA\; Vc\; represents\; the\; total\; volume\; of\; the\; catalyst\; particles\; under\; consideration\; and\; that\; SIGMA\; Vp\; is\; found\; by\; adding\; up\; the\; peel\; volumes\; present\; in\; the\; catalyst\; particles,\; the\; latter\; being\; regarded\; as\; being\; composed\; of\; a\; kernel\; surrounded\; by\; a\; peel,\; which\; kernel\; is\; of\; such\; a\; shape\; that\; at\; every\; point\; of\; the\; kernel\; perimeter\; the\; shortest\; distance\; (d)\; to\; the\; perimeter\; of\; the\; peel\; is\; the\; same,\; d\; being\; equal\; for\; all\; catalyst\; particles\; under\; consideraton,\; and\; having\; been\; chosen\; such\; that\; the\; quantity\; of\; cobalt\; present\; in\; SIGMA\; Vp\; is\; 90\%\; of\; the\; quantity\; of\; cobalt\; present\; in\; SIGMA\; Vc.$$