Rh/SiO/sub 2/ and Rh/Al/sub 2/O/sub 3/ catalysts: effect of precursor and H/sub 2/ pretreatment on chemisorption and catalytic activity
In a previous work it was suggested that the nature of the precursor was important in determining the oxidation state of Rh in supported catalysts and therefore in their catalytic activity. The initial purpose of the present study was to investigate the influence of the metal precursor (RhCl/sub 3/ or Rh(NO/sub 3/)/sub 3/) used in the preparation, on the catalytic activity of Al/sub 2/O/sub 3/- and SiO/sub 2/-supported Rh catalysts. The reactions chosen for that purpose were the hydrogenolysis of ethane and the hydrogenation of benzene. The observation that on Al/sub 2/O/sub 3/-supported catalysts the activity for ethane hydrogenolysis was increasing with time at temperatures slightly higher than the reduction temperature prompted the authors to determine the effect of rereduction temperature on the catalytic activity. The results of this study are also presented in this note. TPR, TPD, and H/sub 2/ chemisorption techniques were used in the characterization of the catalysts. 8 references.
- Research Organization:
- PLAPIQUI (UNS-CONICET), Bahia Blanca (Argentina)
- OSTI ID:
- 5204050
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 98:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BENZENE
CATALYST SUPPORTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMICAL STATE
CHEMISORPTION
CHLORIDES
CHLORINE COMPOUNDS
COMPARATIVE EVALUATIONS
ELEMENTS
ETHANE
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
HYDROGENATION
METALS
MINERALS
NITRATES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
REDUCTION
REFORMER PROCESSES
REFRACTORY METAL COMPOUNDS
RHODIUM
RHODIUM CHLORIDES
RHODIUM COMPOUNDS
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS