WERKWIJZE VOOR HET BEREIDEN VAN GRAFIET BEVATTENDE KOOL, WERKWIJZE VOOR HET BEREIDEN VAN EEN PLATINAKATALYSATOR VOOR WATERSTOFOVERDRACHTSREACTIES EN WERKWIJZE VOOR HET OMZETTEN VAN KOOLWATERSTOFFEN MET WATERSTOF.

摘要

Graphite-contg. carbon for use as a carrier for platinum gp. catalysts (pref. 0.01-10 wt. %, esp. 0.1-5 wt. % of Pt or Ir) has a basis surface area of at least 100 m2/g. (pref. 150-1000 m2/g.); the ratio of the BET-surface area to the basis surface area is =5:1; and the ratio of the basis surface area to the edge surface area is at least 5:1 (pref. >10:1, esp. >300:1). (The basis surface area is the area of crystal lamina main surfaces; the edge surface area denotes the area of crystal lamina edges; the BET-surface area is the sum of the basis surface area, edge surface area and the surface area of the amorphous phase). The catalyst may contain a minor amt. of alkali(ne earth) metal ions as modifiers (pref. Na) in a ratio of 10-300 atm. % w.r.t. the Pt. gp. metal. Catalysts contg. Pt.-gp. metals on the above graphite-contg. carbon support are esp. suitable for reactions involving hydrogen, in particular hydrogenation, dehydrogenation or dehydrocyclisation of hydrocarbons. High yields are obtained. Side reactions are suppressed.